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Evaluation of Nutritional Composition of Two Fonio Ecotypes Grown in Casamance (Sénégal)
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作者 Amadou Bouye Seydi Amadou Diop 《Open Journal of Applied Sciences》 2024年第2期533-544,共12页
In order to better understand the cultural route, biochemical and nutritional composition of two ecotypes of fonio, a study was carried out in village of Tambananing located approximately 7 km from Sédhiou. The o... In order to better understand the cultural route, biochemical and nutritional composition of two ecotypes of fonio, a study was carried out in village of Tambananing located approximately 7 km from Sédhiou. The objective of studies was to determine nutritional composition of two ecotypes of fonio: the first called momo in short-cycle mandinka (75 - 90 days) and the other called medium-cycle dibong (90 - 110 days). For this, samples of two ecotypes were collected in an experimental field which was split into two equal parts, one sown with the momo ecotype and the other with the dibong ecotype. The nutritional composition (sugars, fats, proteins, minerals, ash, etc.) and the physicochemical properties (pH, humidity, water activity, color, etc.) of fonio’s were determined by appropriate physicochemical methods. The two ecotypes exhibited quite similar physicochemical properties. The levels of biochemical compounds were relatively close with protein contents of 7.05 ± 0.06 mg/100g for the momo ecotype and of 8.02 ± 0.04 mg/100g for the dibong ecotype, in carbohydrates (76.37 ± 1.2 mg/100g for momo and 78.7 ± 1.5 mg/100g for dibong) and in fat (2.92 ± 0.05 mg/100g for momo and 3.14 ± 0.004 mg/100g for dibong). Identical mineral element contents were found except for iron, an element for which the contents were 10.80 ± 0.008 mg/100g for the momo ecotype and 99.59 ± 0.005 mg/100g for the dibong ecotype. Thus, two ecotypes of fonio present a fairly interesting nutritional composition and their consumption deserves to be popularized and could contribute effectively to fight against the problems of malnutrition of certain vulnerable groups. 展开更多
关键词 Biochemical Composition ecotypeS Fonio Casamance
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Morphometric Traits Differentiation and Phenotypic Diversity of Two Snail Species Ecotypes Archachatina marginata and Achatina fulica in the Western Highlands of Cameroon
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作者 Gorothy Nkwendem Djouatsa Blaise Arnaud Hako Touko +3 位作者 Sandrine Tsayo Tchinda Constantin Nzwessa Félix Meutchieye Alexis Teguia 《Open Journal of Animal Sciences》 2023年第3期345-363,共19页
This study was conducted from June 2021 to January 2023 to assess the genetic diversity of giant African snails in the western highlands of Cameroon. A total of 652 snails were randomly collected from the wild in thre... This study was conducted from June 2021 to January 2023 to assess the genetic diversity of giant African snails in the western highlands of Cameroon. A total of 652 snails were randomly collected from the wild in three localities in the western highlands (Bafang, Bafoussam, and Santchou). The study revealed significant variations in morphobiometric characteristics both between species and localities. The predominant shell coloration was brownish with yellow zigzag stripes (65%), while the dominant coloration for shell openings was whitish (48%). Regarding foot coloration, both brown with spotted black and black with spotted brown colorations were dominant (29%). The highest recorded live weight of snails (39.33 ± 34) was found in the species Archachatina marginata. In terms of length measurements (in mm), the length of the right and left sides of the shell was higher in the A. fulica species (49.8 ± 19.7 mm and 40.07 ± 18 mm, respectively). Bafang exhibited the highest values for shell length (56 ± 11 mm) and shell width (46.52 ± 11.46 mm). A. fulica recorded the highest shell length (81.5 ± 27 mm), while A. marginata recorded the highest shell width (49.6 ± 12.1 mm), with the highest values observed in A. fulica from fulica having a slightly higher aperture width value (30 ± 10 mm) compared to A. marginata, while A. marginata had the highest value for aperture length measurement (54.5 ± 12 mm). A. fulica also exhibited the highest values for the length from apex to the first whorl and the length from left to right of the first whorl (43.2 ± 18 mm and 39 ± 19.8 mm, respectively). Strong and positive correlations were observed between the live weight of snails and body measurements regardless of species, except for the number of whorls, which showed very weak or negative correlations with other body measurements. The results of Hierarchical Cluster Analysis (HCA) revealed three distinct snail population types. These findings provide valuable insights into the phenotypic diversity of edible land snails in the western highlands of Cameroon and can be considered in improvement and conservation programs aimed at enhancing snail meat yield. 展开更多
关键词 PHENOTYPE Diversity ecotypeS Western Highlands of Cameroon
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Seasonal changes of endogenous ABA and cytokinins in environmental adaptation of different ecotypes of reed plants 被引量:9
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作者 Wang Hongliang , Zhang Chenglie(Department of Biology, Lanzhou University , Lanzhou 730000 , China) 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 1995年第4期449-454,共6页
SeasonalchangesofendogenousABAandcytokininsinenvironmentaladaptationofdifferentecotypesofreedplantsWangHongl... SeasonalchangesofendogenousABAandcytokininsinenvironmentaladaptationofdifferentecotypesofreedplantsWangHongliang,ZhangChengli... 展开更多
关键词 ABA CYTOKININ ecotype environmental adaptation Phragmites communis T.
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Genetic Diversity of Seed Storage Proteins in Different Ecotype Varieties of japonica Rice and Its Application 被引量:3
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作者 JIN Wei-dong LI Na HONG De-lin 《Rice science》 SCIE 2006年第2期85-92,共8页
One hundred and fifteen varieties (including cultivars and lines) with different ecotypes in japonica rice (Oryza sativa L.) were analyzed for endosperm storage proteins by sodium dodecyl sulfate polyacrylamide ge... One hundred and fifteen varieties (including cultivars and lines) with different ecotypes in japonica rice (Oryza sativa L.) were analyzed for endosperm storage proteins by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) to estimate their genetic diversity for the purpose of genetic improving and variety identification. Nineteen types of profile were identified according to 1) presence/absence of 65 kDa bands, 2) staining intensity of 70, 60, 57, 37-39, 22-23, 13 and 10 kDa bands, 3) migration velocity of 35 kDa (α-4) and 4) band number at 57 kDa location. An unweighted-pair group average method with arithmetic mean (UPGMA) dendregram based on the cluster analysis of genetic similarity of the protein bands showed a small genetic variation among the tested materials, with the similarity coefficients varying between 0.75 and 1.00. Three distinct groups were identified from the cluster analysis of the rice varieties studied at the similarity coefficient level of 0.894. The first group included eight varieties with high amylose content, the second group contained fifteen varieties with high protein content, and the third group had the remaining ninety-two varieties, which accounted for 80% of the total materials. Clear relationship between ecotypes distinguished by maturity and groups revealed by cluster analysis was not found in this study. Only the group of high amylose linked with medium-maturity medium japonica ecotype. The bands of 70 kDa and 65 kDa can be used as protein markers to identify F1 seed purity of japonica hybrid rice Liuyanyou 422. 展开更多
关键词 genetic diversity japonica rice ecotype storage protein ELECTROPHORESIS
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Differences in response of desert plants of different ecotypes to climate warming:a case study in Minqin, Northwest China 被引量:4
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作者 ZhaoFeng CHANG ShuJuan ZHU +1 位作者 FuGui HAN ShengNian ZHONG 《Journal of Arid Land》 SCIE 2012年第2期140-150,共11页
Globally climates are warming. How do desert plants of different ecotypes respond to the climate change? This paper studied the differing responses to climate warming shown by desert plants of different ecotypes thro... Globally climates are warming. How do desert plants of different ecotypes respond to the climate change? This paper studied the differing responses to climate warming shown by desert plants of different ecotypes through analyzing the phenology and meteorological data of 22 desert plant species growing in Minqin Desert Bo- tanical Garden in Northwest China during the period 1974-2009. The results indicate: (1) The temperature in the study area has risen quickly since 1974, and plants' growing periods became longer. The spring phenology of mesophytes advanced, and the autumn phenology of xerophytes was delayed; (2) The starting dates of spring phenophase of mesophytes and xerophytes differed significantly and both showed an advancing trend; (3) The spring phenology of mesophytes advanced by more days than that of xerophytes, whereas the autumn phenology of mesophytes was delayed by less days than that of the xerophytes; and (4) Mesophytes are more sensitive than xerophytes to rising temperature in spring and falling temperature in autumn. These findings are of value in plant management and regional introduction of different species. 展开更多
关键词 desert plants plant phenology phenophases ecotypeS climate warming Minqin
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Intraspecific diversity: adaptive differentiation of Picea mongolica W. D. Xu ecotypes 被引量:3
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作者 LIU An-tian ZOU Chun-jing +3 位作者 ZHANG Chao ZHENG Yuan-run Hideyuki SHIMIZU XU Wen-duo 《Forestry Studies in China》 CAS 2011年第3期189-197,共9页
Picea mongolica W. D. Xu is an endemic and endangered species which is only found in semi-arid areas of northern China. It has been widely used as an afforestation tree in the establishment of the Three-North Shelterb... Picea mongolica W. D. Xu is an endemic and endangered species which is only found in semi-arid areas of northern China. It has been widely used as an afforestation tree in the establishment of the Three-North Shelterbelt System for its adaptation to arid soils and as a virescent tree in urban gardens and streets for its beautiful shape. Due to different microenvironments, P. mongolica populations may differentiate into many ecological groups with different adaptive abilities. Long-term adaptation to a dry environment makes P. mongolica differentiate into different ecotypes. Typical ecotypes are P. mongolica f. purpurea (Fp), P. mongolica f. rubra (Fr) and P. mongolica f. viridis (Fv). Our results show that cone size is clearly not uniform among different ecotypes; the largest cones are found in the Fv ecotype and the smallest in Fp. There were also distinct differences between these ecotypes in terms of height and length of squama. At the molecular level, the zymograms of peroxidase and lipase prove the existence of different ecotypes in P. mongolica. The results are useful for investigating and managing this rare spruce species in China. 展开更多
关键词 Picea mongolica W. D. Xu intraspecific diversity adaptive differentiation ecotype
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Yellowing of disease? Or differentiating for adaptation? Study on Cinnamomum camphora ecotypes 被引量:1
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作者 LI Qing ZOU Chun-jing +1 位作者 XU Ying Shimizu HIDEYUKI 《Forestry Studies in China》 CAS 2010年第2期67-73,共7页
Cinnamomum camphora (L.) Presl is an evergreen broad-leaved tree of the Lauraceae family, widely distributed in the sub-tropical areas in the south of China and used as a virescent tree in urban gardens and streets ... Cinnamomum camphora (L.) Presl is an evergreen broad-leaved tree of the Lauraceae family, widely distributed in the sub-tropical areas in the south of China and used as a virescent tree in urban gardens and streets in Shanghai for its beautiful shape and intensive stress-resistance. However, yellowing of C camphora in recent years casts doubt about its significance. We believe the green-leaved and yellow-leaved C camphora might be two different ecotypes, and tentatively refer to the green-leaved C camphora as C camphora f. viridis f. nov (CCV) and the yellow-leaved as C camphora f.flavus f. nov (CCF). We studied their differences and arrived at the following conclusions: 1) compared with CCF, the area of lamina of CCV is significantly larger and the amount of chlorophyll (Chl) significantly higher; 2) the lamina and palisade tissues of CCV are significantly thicker than those of CCF, but its cuticle is significantly thinner; 3) the shape of the stomata of CCV is different from that of the CCF; the stomatal density and stomatal index of CCV are significantly lower than those of CCF. These results show that C camphora might evolve adaptive dif- ferentiation in some aspects which can be used in virescence in urban streets and gardens. 展开更多
关键词 Cinnamomum camphora ecotype differentiation CHLOROPHYLL stomatal parameters
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The adaptive significance of differences of root morphology, anatomy and physiology from three ecotypes of reed(Phragmites communis Trin.)
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作者 YuBing Liu XinRong Li +2 位作者 ZhiShan Zhang XiaoJun Li Jin Wang 《Research in Cold and Arid Regions》 CSCD 2016年第3期196-204,共9页
Reeds are widely distributed in drought and high salt conditions of northwestern China. Leaf epidermal micromorphology, anatomy, chloroplast ultrastructure and physio-chemical characteristics due to long-term adaptati... Reeds are widely distributed in drought and high salt conditions of northwestern China. Leaf epidermal micromorphology, anatomy, chloroplast ultrastructure and physio-chemical characteristics due to long-term adaptation in the natural habitats of common reed (Phragmites communis Trin.) contrasted considerably among three different ecotypes: dune reed (DR), Gobi salt reed (GSR) and swamp reed (SR). The main objective of the present study is to determine the adapting characteristics of morphology, anatomy and physiological responses of thin roots in DR, GSR and SR. The results show that root length density was higher in SR and few root hairs were observed in DR. Cross-section anatomical features show that each ecotype has an endodermis and exodermis, while cortex thickness and proportion of root cortical aerenchyma and stele in root structure varied among the three ecotypes. The stele and xylem share a larger area in DR compared to GSR and SR. GSR has a large proportion of the cortex with radialized distribution of aerenchyma cells spacing, and the cortex has a peripheral, mechanically stiff ring in the exodermis. SEM and TEM microscope images show that GSR has a scle- renchyma ring with high lignification in the exodermis. The physio-chemical parameters show that GSR had a higher level of stress tolerance than DR. These findings indicate that developed water-absorbing tissues were largely distributed in the root structure of DR, and a main framework with supporting function spacing with aerenchyma was dominant in GSR in the long term adaptation to their natural habitats, respectively. 展开更多
关键词 Phragmites communis ecotype root morphology cross-section anatomy physio-chemical parameters
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Comparative Analyses of Stomatal Size and Density among Ecotypes of <i>Aster hispidus</i>(Asteraceae)
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作者 Yoshimasa Kumekawa Haruki Miyata +6 位作者 Kyohei Ohga Hiroshi Hayakawa Jun Yokoyama Katsura Ito Shin-ichi Tebayashi Ryo Arakawa Tatsuya Fukuda 《American Journal of Plant Sciences》 2013年第3期524-527,共4页
To determine the size and the density of stomata among different environments, we conducted anatomical analyses using Aster hispidus var. hispidus (open field), As. hispidus var. leptocladus (serpentine soil), and As.... To determine the size and the density of stomata among different environments, we conducted anatomical analyses using Aster hispidus var. hispidus (open field), As. hispidus var. leptocladus (serpentine soil), and As. hispidus var. insularis (coastal). The stomatal size was not significantly different among these ecotypes but the density of stomata in the serpentine and coastal ecotypes was significantly lower than that of As. hispidus var. hispidus, which suggests that these ecotypes have experienced selection that reduced the density of stomata for adaptation to the dry conditions of serpentine and coastal areas. 展开更多
关键词 ASTER hispidus Costal ecotype DENSITY Guard Cell Serpentine SIZE
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Morphological and Anatomical Variations in Rheophytic Ecotype of Violet, Viola mandshurica var. <i>ikedaeana</i>(Violaceae)
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作者 Ryosuke Matsui Shogo Takei +7 位作者 Kyohei Ohga Hiroshi Hayakawa Masataka Yoshida Jun Yokoyama Katsura Ito Ryo Arakawa Toshiro Masumoto Tatsuya Fukuda 《American Journal of Plant Sciences》 2013年第4期859-865,共7页
We compared the leaf morphology and anatomy of the putative rheophytic ecotype of Viola mandshurica W. Becker var. ikedaeana (W. Becker ex Taken.) F. Maek. and its closely related variety, V. mandshurica var. mandshur... We compared the leaf morphology and anatomy of the putative rheophytic ecotype of Viola mandshurica W. Becker var. ikedaeana (W. Becker ex Taken.) F. Maek. and its closely related variety, V. mandshurica var. mandshurica. We showed that the leaf of the rheophytic ecotype of V. mandshurica var. ikedaeana was narrower than that of V. mandshurica var. mandshurica. Moreover, the leaf thickness and guard cell size of the rheophytic ecotype of V. mandshurica var. ikedaeana were significantly larger than those of V. mandshurica var. mandshurica. We further showed that leaves of the rheophytic ecotype of V. mandshurica var. ikedaeana contained fewer cells than did those of V. mandshurica var. mandshurica. Our results suggest that the narrower leaves of V. mandshurica var. ikedaeana are caused by a decrease in the number of cells. A narrower leaf may enable the rheophytic ecotype of V. mandshurica var. ikedaeana to resist the strong flow of water that occurs after heavy rainfall, while a thicker leaf may enhance tolerance to desiccation and high- intensity light. 展开更多
关键词 ecotype Leaf Rheophyte Stenophyllization VIOLA mandshurica
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Control of Leaf Spot Diseases on Ecotypes of Faba Bean (<i>Vicia faba</i>L.) Produced in the Andean Region of Bolivia
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作者 M. Coca-Morante F. Mamani-álvarez 《American Journal of Plant Sciences》 2012年第8期1150-1158,共9页
The basin of Lake Titicaca is a faba bean-producing microregion of Bolivia where the crop is destined for export. The most commonly cultivated ecotypes “Gigante de Copacabana” and “Usnayo” are affected by diseases... The basin of Lake Titicaca is a faba bean-producing microregion of Bolivia where the crop is destined for export. The most commonly cultivated ecotypes “Gigante de Copacabana” and “Usnayo” are affected by diseases that can cause production losses. The aims of the present work were to identify the causal agents of leaf spot affecting these ecotypes, to record disease intensity levels, and to estimate their effect on production. In 2004 and 2005, leaflet, stem and pod samples were taken from faba bean plants with leaf spot growing in the Lake Titicaca area, and from plants in an experimental plot established to determine the effect of five different treatments on production and disease intensity: T1 = Control;T2 = seed treatment with Trichoderma sp. + alternate foliar spraying with benomyl and mancozeb;T3 = seed treatment with fludioxanil/metalaxyl M + alternate foliar spraying with benomyl and mancozeb;T4 = foliar spraying with Trichoderma sp.;T5 = alternate foliar spraying with cymoxanyl and mancozeb-chlorothalonil. Microscopic analysis of the samples revealed the presence of new fungal pathogens for faba beans in Bolivia (Cladosporium sp., and Lepthosphaerulina sp.) as well as emerging fungal pathogens (Botrytis cinerea, B. fabae, Ascochyta fabae, Alternaria sp. and Cercospora sp.). None of the treatments affected the disease progression curve (DPC) for incidence, although effects were seen with respect to disease severity. The seed + foliar treatments (T2 and T3) were more effective at controlling disease than leaf treatments on their own (T4 and T5). Modelling analysis showed faba bean leaf spot disease to be moderately destructive. Compared to chemical treatments, biocontrol with Trichoderma spp. preliminary was found to provide good control of the disease. Losses due to leaf spot disease of 36% were recorded, and a strong correlation detected between yield and disease severity. 展开更多
关键词 ecotypeS Modeling DISEASES Intensity
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Research advances on ecotype and sub-ecotype differentiation of Prochlorococcus and its environmental adaptability 被引量:1
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作者 Wei YAN Xuejin FENG +2 位作者 Wei ZHANG Rui ZHANG Nianzhi JIAO 《Science China Earth Sciences》 SCIE EI CAS CSCD 2020年第11期1691-1700,共10页
Prochlorococcus,a group of marine cyanobacteria,is the most abundant and smallest oxygen-producing photosynthetic microorganism.It is mainly distributed in the euphotic zone of tropical and subtropical oceans and is a... Prochlorococcus,a group of marine cyanobacteria,is the most abundant and smallest oxygen-producing photosynthetic microorganism.It is mainly distributed in the euphotic zone of tropical and subtropical oceans and is a key participant in the marine biogeochemical cycle.Prochlorococcus has evolved continuously to adapt to the marine environment,and can be considered a recent evolutionary form of cyanobacteria,one of the most ancient life forms.The diverse ecotypes and subecotypes of Prochlorococcus increase its genomic diversity and environmental adaptability,allowing Prochlorococcus to become a dominant species in its environment.Here we review the ecotype classification and distribution,ecotype and subecotype differentiation,and environmental adaptability of Prochlorococcus.We also evaluate the role and significance of ecotype and sub-ecotype differentiation of Prochlorococcus,and discuss future research directions on this basis. 展开更多
关键词 PROCHLOROCOCCUS ecotype Sub-ecotype Environmental adaptation
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Whole-Genome Resequencing of a Worldwide Collection of Rapeseed Accessions Reveals the Genetic Basis of Ecotype Divergence 被引量:11
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作者 Dezhi Wu Zhe Liang +23 位作者 Tao Yan Ying Xu Lijie Xuan Juan Tang Gang Zhou Ulrike Lohwasser Shuijin Hua Haoyi Wang Xiaoyang Chen Qian Wang Le Zhu Antony Maodzeka Nazim Hussain Zhilan Li Xuming Li Imran Haider Shamsi Ghulam Jilani Linde Wu Hongkun Zheng Guoping Zhang Boulos Chalhoub Lisha Shen Hao Yu Lixi Jiang 《Molecular Plant》 SCIE CAS CSCD 2019年第1期30-43,共14页
Rapeseed (Brassica napus),an important oilseed crop,has adapted to diverse climate zones and latitudes by forming three main ecotype groups,namely winter,semiwinter,and spring types. However,genetic variations underly... Rapeseed (Brassica napus),an important oilseed crop,has adapted to diverse climate zones and latitudes by forming three main ecotype groups,namely winter,semiwinter,and spring types. However,genetic variations underlying the divergence of these ecotypes are largely unknown. Here,we report the global pattern of genetic polymorphisms in rapeseed determined by resequencing a worldwide collection of 991 germplasm accessions.A total of 5.56 and 5.53 million singlenucleotide polymorphisms (SNPs)as Well as 1.86 and 1.92 million InDels were identified by mapping reads to the reference genomes of "Darmor-bzh"and "Tapidor,"respectively.We generated a map of allelic drift paths that shows splits and mixtures of the main populations,and revealed an asymmetric evolution of the two subgenomes of B.napus by calculating the genetic diversity and linkage disequilibrium parameters.Selective-sweep analysis revealed genetic changes in genes orthologous to those regulating various aspects of plant development and response to stresses.A genome-wide association study identified SNPs in the promoter regions of FLOWERING LOCUS T and FLOWERING LOCUS C orthologs that corresponded to the different rapeseed ecotype groups. Our study provides important insights into the genomic footprints of rapeseed evolution and flowering-time divergence among three ecotype groups,and will facilitate screening of molecular markers for accelerating rapeseed breeding. 展开更多
关键词 Brassica NAPUS genome RESEQUENCING selective sweep ecotype DIVERGENCE GWAS floweringtime trait
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Environmental conditions and genetic differentiation:what drives the divergence of coexisting Leymus chinensis ecotypes in a large-scale longitudinal gradient? 被引量:4
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作者 Shan Yuan Chengyuan Guo +1 位作者 Linna Ma Renzhong Wang 《Journal of Plant Ecology》 SCIE 2016年第5期616-628,共13页
Aims The two coexisting Leymus chinensis ecotypes exhibit remarkable divergences in adaptive strategies under drought and salinity in semi-humid meadows and semi-arid steppes.In order to detect the major genetic and e... Aims The two coexisting Leymus chinensis ecotypes exhibit remarkable divergences in adaptive strategies under drought and salinity in semi-humid meadows and semi-arid steppes.In order to detect the major genetic and environmental factors dominating the intraspecific phenotype variations and ecotype formation,the questions regarding the two distinct phenotypic forms(ecotypes)in L.chin-ensis were addressed:(i)did environments drive the L.chinensis ecotype formation?(ii)was there a molecular basis for the morphological divergence between the two ecotypes?(iii)which driving force dominated the intraspecies divergence,divergent natural selection,genetic drift or stabilizing selection?Methods We applied a series experiments on demographical,morphological and physiological traits of two Leymus chinensis ecotypes with gray green(GG)and yellow green(YG)leaf color in nine wild sites along a longitudinal gradient from 114°to 124°E in northeast China.The environmental data including mean annual precipitation,mean annual temperature,elevation and soil properties were collected.We compared the differences of morphological,physiological and genetic differentiations between the two ecotypes.Important FindingsThe GG type exhibited stronger fitness than YG type from the population densities,morphological traits(e.g.shoot height,leaf area,leaf and seed weights et al.),leaf mass per area(LMA)and physiological traits[relative water content(RWC),proline,soluble sugar contents].Most of above phenotypes(e.g.total shoot densities,spike length et al.)were significantly correlated with mean annual precipitation,mean annual temperature and soil water content(SWC),rarely a correlated with soil pH and soil nutrient.Transplanted populations showed convergence trend by their leaf chlorophyll contents and osmotic adjustments(proline and soluble sugar contents)in the greenhouse,but still exhibited their divergences between two ecotypes in the outdoor transplantation,suggesting that whether L.chinensis ecotype differentiated could be largely affected by the environmental conditions.Furthermore,by the comparison result of quantitative genetic variation(Q_(ST))values from phenotypes with theoretical neutral genetic differentiation(F_(ST)),differentiation in phenotypic traits greatly surpassed neutral predictions,implying that directional natural selection played a crucial role in L.chinen-sis ecotype differentiation.In addition,microsatellite analysis from Neighbor-joining tree and Bayesian assignment generated into two groups according to ecotypes,indicating molecular genetic differentiation also propelled the two ecotypes divergence.We conclude that L.chinensis population variations were driven by combing divergent natural selection(precipitation,temperature and SWCs)along the large-scale gradient and significantly intrinsic genetic differentiation. 展开更多
关键词 genetic differentiation large-scale gradient microsatellites phenotypic traits Leymus chinensis ecotypes
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Discovery of a high-altitude ecotype and ancient lineage of Arabidopsis thaliana from Tibet 被引量:3
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作者 Liyan Zeng Zhuoya Gu +22 位作者 Min Xu Ning Zhao Weidong Zhu Takahiro Yonezawa Tianmeng Liu Lha Qiong Tashi Tersing Lingli Xu Yang Zhang Rongyan Xu Ningyu Sun Yanyan Huang Jiankun Lei Liang Zhang Feng Xie Fang Zhang Hongya Gu Yupeng Geng Masami Hasegawa Ziheng Yang M. James C. Crabbe Fan Chen Yang Zhong 《Science Bulletin》 SCIE EI CAS CSCD 2017年第24期1628-1630,共3页
Arabidopsis thaliana(A.thaliana)has long been a model species for dicotyledon study,and was the first flowering plant to get its genome completed sequenced[1].Although most wild A.thaliana are collected in Europe,seve... Arabidopsis thaliana(A.thaliana)has long been a model species for dicotyledon study,and was the first flowering plant to get its genome completed sequenced[1].Although most wild A.thaliana are collected in Europe,several studies have found a rapid A.thaliana west-east expansion from Central Asia[2].The Qinghai-Tibet Plateau(QTP)is close to Central Asia and known for its high alti- 展开更多
关键词 Discovery of a high-altitude ecotype and ancient lineage of Arabidopsis thaliana from Tibet QTP
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New insights into diet breadth of polyphagous and oligophagous aphids on two Arabidopsis ecotypes 被引量:1
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作者 Christopher Wattier Amelie Turbant +3 位作者 Lisa Sargos-Vallade Jerome Pelloux Christine Rusterucci Anas Cherqui 《Insect Science》 SCIE CAS CSCD 2019年第4期753-769,共17页
We investigated whether plant ecotype might affect aphid performance and behavioi. The probing behaviors of the polyphagous aphid Myzus persicae and the oligophagous aphid Brevicoryne brassicae on two ecotypes of Arab... We investigated whether plant ecotype might affect aphid performance and behavioi. The probing behaviors of the polyphagous aphid Myzus persicae and the oligophagous aphid Brevicoryne brassicae on two ecotypes of Arabidopsis thaliana, WS and Col-0 were recorded using the direct current electrical penetration graph method (DC-EPG). Myzus persicae displayed a significant preference for the WS ecotype but was not greatly disturbed on Col-0, while B. brassicae discriminated between the two A. thaliana ecotypes, feeding less on WS than on Col-0. A Principal Component Analysis of aphid probing behavior data recorded on Col-0 and WS ecotypes showed that the one of M. persicae was positively correlated with the phloem ingestion phases while the one of B. brassicae was more related to nonfeeding phase. The survival of the aphid species was followed during early larval stages on the two ecotypes and a significantly higher mortality was observed of B. brassicae neonates compared to M. persicae. Both reared on WS. Moreover, transcriptomic analysis of non infested plant leaves from both ecotypes was monitored and underlined constitutive differences between Col-0 and WS gene expression that might explain the different aphid behaviors. Among a unigene set comprising 39 042 sequences for A. thaliana, 6% were differently expressed affecting, for example, the secondary metabolites and cell wall pathways: two third upregulated in WS and one third upregulated in Col-0. Thus, the "ecotype” variable should be taken into account when setting up a plant-insect experimental research. 展开更多
关键词 ARABIDOPSIS THALIANA Brevicoryne brassicae ecotypeS EPG microarray MYZUS persicae
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Analysis on the indicator species and ecological groups of pelagic ostracods in the East China Sea 被引量:9
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作者 XU Zhaoli 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2008年第6期83-93,共11页
Ecological adaptation and ecological groups of pelagic ostracods were examined in the East China Sea (23°30′-33°00′N, 118°30′ -128°00′E), in relation to temperature and salinity. The data we... Ecological adaptation and ecological groups of pelagic ostracods were examined in the East China Sea (23°30′-33°00′N, 118°30′ -128°00′E), in relation to temperature and salinity. The data were collected in four surveys conducted from 1997 to 2000. The density, yield density, or negative exponent models were used to determine the optimal temperature and salinity of water for the thriving growth of pelagic ostracods. Thereafter, ecological groups and potential distribution patterns of pelagic ostracods were determined based on the predicted parameters such as optimal temperature and salinity, consulting the geographic distribution. The analytical results indicate that, among the numerical dominant pelagic ostracods in the East China Sea (ECS), Euconchoecia aculeata, E. elongata, E. chierchiae, E. maimai, and Cypridina dentata, etc. are offshore subtropical water species. These species are widely distributed in the area, and they can be brought by the warm current to north offshore during spring and winter. The predicated optimal temperature (OT) and optimal salinity (OS) for Paraconchoecia decipiens, P. echinata, P. spini- fera, P. oblonga, Conchoecia magna and Porroeciaporrecta are all greater than 25℃ and 34 separately. These species are mainly distributed in the waters of the Kuroshio, the Taiwan Warm Current, and the Taiwan Strait, and therefore are designated as ocean- ic tropical water species. On the other hand, Pseudoconchoecia concerttrica is considered as offshore subtropical water species based on its geographical distribution although its OT is 19℃. The other species, though their OSs are approximately 34 and with OTs ranging from 20° to 25℃, are considered as offshore subtropical water species because they were found to be widely distributed from the South China Sea to the East China Sea. 展开更多
关键词 ZOOPLANKTON pelagic ostracods ecotype temperature SALINITY East China Sea indicator species
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Effect of different levels of nitrogen deficiency on switchgrass seedling growth 被引量:4
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作者 Yi Zhu Xifeng Fan +2 位作者 Xincun Hou Juying Wu Tao Wang 《The Crop Journal》 SCIE CAS 2014年第4期223-234,共12页
Switchgrass(Panicum virgatum L.) is a warm-season rhizomatous perennial grass that can tolerate diverse abiotic stresses while yielding relatively high biomass, and is considered a leading biofuel feedstock for margin... Switchgrass(Panicum virgatum L.) is a warm-season rhizomatous perennial grass that can tolerate diverse abiotic stresses while yielding relatively high biomass, and is considered a leading biofuel feedstock for marginal lands. Nitrogen(N) is crucial for the growth and development of switchgrass, and its tolerance to low N supply and high N use efficiency are very important for its production under poor conditions. The large-scale planting of switchgrass on marginal lands could be an effective approach to solving the problem of feedstock supply for biomass energy. This study used a hydroponic experiment to evaluate the effect of N deficiency on switchgrass seedlings. Three N treatments(0, 0.15, and 1.50 mmol L-1Hoagland's solution)and six cultivars were used, three of each ecotype(upland and lowland). The results showed that biomass, leaf area, root surface area, net photosynthesis, and total chlorophyll content significantly decreased under low N treatments compared with those in full strength Hoagland's nutrient solution. However, once established, all plants survived extreme N stress(0 mmol L-1) and, to some extent, were productive. Cultivar Kanlow performed best of the six cultivars under stress. Significant interactions between stress treatment and cultivars showed that breeding for cultivars with high yield and superior performance under N deficiency is warranted. The lowland outperformed the upland ecotypes under stress, suggesting that lowland cultivars may survive and be productive under a wider range of stress conditions.However, given the better adaptability of lowland ecotypes to hydroponic cultivation, further study is needed. 展开更多
关键词 BIOFUEL NITROGEN DEFICIENCY SWITCHGRASS ecotype
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Study on Relationship Between Cucumber Germplasm and Propamocarb Residue Using Subjective Rating Technique 被引量:1
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作者 Wu Peng Qin Zhi-wei +3 位作者 Zhou Xiu-yan Wu Tao Xin Ming Guo Qian-qian 《Journal of Northeast Agricultural University(English Edition)》 CAS 2014年第1期1-9,共9页
Propamocarb (PM) residue in cucumber (Cucumis sativus L.) receives little attention. As is well known to all, high PM residue of cucumber could lead to increase in the violation rates of maximum residue limits and... Propamocarb (PM) residue in cucumber (Cucumis sativus L.) receives little attention. As is well known to all, high PM residue of cucumber could lead to increase in the violation rates of maximum residue limits and ultimately cause harm to human health. Knowledge of PM residue could help cucumber breeders in developing cultivars with low PM residue and improving cucumber quality. In this study, 32 representative cucumber accessions (26 breeding lines and six cultivars) from different regions of China were evaluated for their PM residue in fruit and leaf to provide meaning to the subjective rating, which was highly correlated with PM residual content of fruit (r=0.97) and leaf (r=0.94). In addition, PM residual content of North China ecotype was the highest and Pickling ecotype was the lowest in fruit and leaf of cucumber. The leaf had significantly higher (P〈0.01) PM residual content than the fruit, and poor correlation between leaf and fruit was represented. This study verified PM residual relationship between fruit and leaf, and laid the foundation for further identification of germplasm resources and breeding of new varieties for low PM residue of cucumber. 展开更多
关键词 CUCUMBER ecotype gas chromatography GERMPLASM propamocarb residue
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Genetic Diversity of Indigenous Chicken (Gallus Gallus domesticus) from Ecozones of Egypt and Kingdom of Saudi Arabia 被引量:1
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作者 Ayman Sabry Alaa Ahmed Mohamed Mohamed Hassen 《Open Journal of Applied Sciences》 2021年第6期775-787,共13页
Genetic diversity of two chicken ecotypes from Ismailia-Egypt (ISM) and Taif-Saudi Arabia (TA) was evaluated using 39 microsatellites. DNA was extracted from blood of 25 chickens/ecotype. The number of alleles was 157... Genetic diversity of two chicken ecotypes from Ismailia-Egypt (ISM) and Taif-Saudi Arabia (TA) was evaluated using 39 microsatellites. DNA was extracted from blood of 25 chickens/ecotype. The number of alleles was 157 and 138, the number of alleles/locus averaged 4.2±2.2 and 3.6±1.6, and the highest number of private alleles was 9 and 5 for ISM and TA, respectively. Percentage of shared alleles between the two ecotypes was 45%. This panel of markers is reasonably informative as the mean polymorphic information content for ISM and TA was 0.47±0.21, and 0.41±0.2. Similar average of observed heterozygosity was attained for both ecotypes. Conversely, averages of expected heterozygosity differed between two ecotypes, 0.52±0.23 vs. 0.45±0.21 for ISM and TA. 8 and 12 loci have significantly deviated from HWE of ISM and TA. Estimate of genetic distance was 0.2 and F<sub>ST</sub> index was 0.29. Results showed only 6% of genetic diversity is shared between these two ecotypes. 展开更多
关键词 ecotypeS Genetic Diversity MICROSATELLITE Polymorphic Information Content Hardy Weinberg Expectation
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