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Asexual Reproduction of Aurelia coerulea Polyps in situ on Settling Plates in Jiaozhou Bay,China
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作者 MI Tiezhu ZHU Jianbin +2 位作者 ZHEN Yu WANG Guoshan WANG Jianyan 《Journal of Ocean University of China》 SCIE CAS CSCD 2024年第5期1371-1380,共10页
Jellyfish blooms are increasingly prevalent coastal phenomena,with Aurelia coerulea being a significant contributor.The complex life history of jellyfish,featuring a sessile polyp stage,is a key factor in bloom format... Jellyfish blooms are increasingly prevalent coastal phenomena,with Aurelia coerulea being a significant contributor.The complex life history of jellyfish,featuring a sessile polyp stage,is a key factor in bloom formation,yet it is challenging to study in the field.This study aimed to describe the asexual reproduction of A.coerulea polyps in Jiaozhou Bay,China,and to assess their ability to form sedentary colonies and their relationship with environmental factors.Using settling plates,we observed polyps in situ and documented three asexual reproduction modes:budding,strobilation,and podocyst formation.Environmental parameters including temperature,salinity,dissolved oxygen(DO),chlorophyll a(Chl a),and the biomass of phytoplankton and zooplankton were monitored.Budding was the predominant reproductive method,featuring stolon budding in autumn and direct budding during the winter and spring seasons.Strobilation took place in the colder months,releasing ephyrae between April and May.Polyp abundance was positively correlated with seawater temperature and negatively correlated with DO concentration.Polyps at 1.0 m depth showed higher survivorship and proliferation over 8 months,whereas those at 2.0 m depth experienced a steady decline and died within 4 months.The study enhances our understanding of the life cycle and asexual reproduction strategies of A.coerulea polyps in the field,with implications for predicting and managing jellyfish blooms.The findings underscore the importance of temperature and DO in polyp survival and suggest that initial polyp population proliferation is crucial for long-term survival. 展开更多
关键词 jellyfish bloom POLYPS BUDDING strobilation asexual reproduction
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Construction and Analysis of Asexual Mutant Population of Tetraploid Potato Longshu 7 Induced by EMS 被引量:2
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作者 柳永强 胡新元 +2 位作者 李掌 蒙孔莉 高彦萍 《Agricultural Science & Technology》 CAS 2016年第8期1780-1785,共6页
[Objective] This study was conducted to detect the variation induction ability of ethyl methanesulfonate (EMS), to construct a mutant population. [Method] 0.6%, 1.2% and 2.4% EMS solutions were used for inducing 2 4... [Objective] This study was conducted to detect the variation induction ability of ethyl methanesulfonate (EMS), to construct a mutant population. [Method] 0.6%, 1.2% and 2.4% EMS solutions were used for inducing 2 400 stem segments of test-tube plantlets of tetraploid potato Longshu 7, and an asexual mutant population including leaf, plant type, stem, stolon, glandular hair traits was constructed. [Result] Twenty two mutation types, i.e. etiolated plantlet, albino plantlet, leaf-color gradient, etiolated vein, wrapped bud, lobed leaf, crinkled leaf, deformed compound leaf, cluster, branch, top enlargement, top bifurcation, succulent, stolon distortion, stolon shift, early tuberization, hair stolon, stem enlargement, vine stem, foliage stem, glandular hair and whorled leaf types were observed in total. There were 52 mutant single plants in total, with a mutation rate of 21.67‰. [Conclusion] The glandular hair, clustered short-stem, branched stem and early tuberization types of mutants have higher application value, and are anticipated to be used in potato functional genome research, gene improvement and germplasm innovation. 展开更多
关键词 Tetraploid potato EMS asexual mutant population Longshu 7
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Transcriptome profiling of indole-3-butyric acid-induced adventitious root formation in softwood cuttings of walnut
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作者 Xiaobo Song Ruimin Huang +3 位作者 Hao Liu Junpei Zhang Yingying Chang Dong Pei 《Horticultural Plant Journal》 SCIE CAS CSCD 2024年第6期1336-1348,共13页
Inducing adventitious root(AR)formation in mature walnut species(Juglans L.)is challenging.However,the AR formation of mature trees can be improved by rejuvenation.In rejuvenated cuttings,exogenous indole-3-butyric ac... Inducing adventitious root(AR)formation in mature walnut species(Juglans L.)is challenging.However,the AR formation of mature trees can be improved by rejuvenation.In rejuvenated cuttings,exogenous indole-3-butyric acid(IBA)is essential for AR formation,and the underlying mechanism is still not well understood.Therefore,we utilized transcriptome sequencing to investigate the mechanism of IBA-induced AR formation.Our results revealed that,in comparison to the control group,IBA treatment(9 mmol·L^(-1))significantly increased the endogenous indole-3-acetic acid(IAA)content,leading to an enhanced rooting rate.We performed RNA sequencing to identify differentially expressed genes(DEGs)between the IBA-treated and control(CK)groups at 1,2,3,and 5 days after cutting(DAC).The results showed that,compared to the control cuttings,there were 1539,889,785,and 984 up-regulated genes and 2791,2936,3017,and 1752 down-regulated genes,at 1,2,3,and 5 DAC,respectively.Analysis of RNA-seq data revealed that G-type ATP-binding cassette 36/37(ABCG36/37)and ATP-binding cassette subfamily D 1(ABCD1),associated with IBA transport,were down-regulated in the rejuvenation cuttings.In contrast,PIN-FORMED(PIN)and PINOID(PID),associated with auxin efflux,were up-regulated.We identified 49 auxin/indole-3-acetic acid(AUX/IAA)-encoding genes,including IAA1,IAA3,IAA5,IAA6,IAA8,IAA11,IAA12,IAA19,and IAA20,which were up-regulated at 1-5 DAC in the rejuvenated cuttings.This study highlights that the overexpression of JrWOX5/11 in poplar significantly enhance AR growth,as evidenced by increased root length,surface area,volume,and quantity.Moreover,the co-expression network analysis involving JrWOX11 and JrWOX5 in walnut cuttings elucidates complex genetic interactions,underscoring their pivotal role in the formation of AR.Our data supported the following molecular mechanism of IBA-induced adventitious root formation.Firstly,IBA is converted to free IAA in peroxisomes.Then,the highly concentrated IAA in the procambium and parenchyma cells induces WUSCHEL-related homeobox 11(WOX11)expression at two days.Finally,WOX11 acts redundantly to up-regulate WOX5,initiating the development of root primordia cells. 展开更多
关键词 WALNUT Adventitious root REJUVENATION asexual reproduction WOX transcription factor
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A preliminary study on life history of marine red alga Stylonema alsidii(Zandardini)Drew f.ramosum Zheng et Li
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作者 Bingxin HUANG Yao ZHANG +4 位作者 Yue CHU Youxuan GUO Junxia LIANG Jianan QIN Lanping DING 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2024年第3期915-922,共8页
Stylonema alsidii(Zandardini)Drew f.ramosum Zheng et Li is a common species in the genus Stylonema,but there are limited reports on morphological taxonomy and a lack of studies on life history and the regulation of ea... Stylonema alsidii(Zandardini)Drew f.ramosum Zheng et Li is a common species in the genus Stylonema,but there are limited reports on morphological taxonomy and a lack of studies on life history and the regulation of early development.The early development,discoid formation,and erect thallus growth of Stylonema alsidii f.ramosum were observed under laboratory conditions.In addition,the influence of main environmental factors such as temperature and light intensity on its development was briefly studied,and various stages of its life history were observed.The result shows:(1)there are two reproductive modes:asexual reproduction and sexual reproduction;(2)the morphology of this species varies in different degrees under laboratory culture conditions;(3)sexual reproduction and asexual reproduction can coexist under suitable conditions.Five pathways of life history were inferred from experimental phenomena.Mature sporophytes form mature gametophytes by producing initially isolated or initially attached monospore,and mature gametophytes form mature sporophytes by fertilization of eggs and sperms.The sexual and asexual reproduction processes of Stylonema alsidii f.ramosum were reported for the first time,and this is also the first report on sexual reproduction in the genus Stylonema. 展开更多
关键词 Stylonema alsidii(Zandardini)Drew f.ramosum Zheng et Li life history environmental factor asexual reproduction sexual reproduction
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Effects of temperature and salinity on the asexual reproduction of Aurelia coerulea polyps 被引量:2
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作者 XING Yongze LIU Qian +3 位作者 ZHANG Mei ZHEN Yu MI Tiezhu YU Zhigang 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2020年第1期133-142,共10页
Aurelia coerulea polyp is an important stage in the outbreaks of this species.To test the combined effects of salinity and temperature on the survival and asexual reproduction of polyps,we maintained 864 polyps at var... Aurelia coerulea polyp is an important stage in the outbreaks of this species.To test the combined effects of salinity and temperature on the survival and asexual reproduction of polyps,we maintained 864 polyps at various salinities(15,25,33,and 40)and temperatures(9,12,15,18,21,and 24℃).Polyps could mostly survive in all treatment combinations except in salinity 15 treatments with low temperatures(9-15℃).Budding occurred at all temperatures(9-24℃),while strobilation only occurred at the low temperatures(9-15℃).The range of 12-15℃was suitable for strobilation and ephyrae release.The optimal range of salinity for asexual reproduction was 25-33.Low(15)or high(40)salinity could significantly reduce the numbers of new buds or ephyrae,and low salinity of 15 retarded and even prevented strobilation at low temperatures.The optimal treatment for budding and strobilation was 21℃-salinity 25 and 12℃-salinity 33,respectively.Salinity had less of an impact than temperature on asexual reproduction,except for the polyps in high or low osmotic pressure conditions. 展开更多
关键词 AURELIA coerulea POLYP temperature SALINITY asexual REPRODUCTION
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The putative elongator complex protein Elp3 is involved in asexual development and pathogenicity by regulating autophagy in the rice blast fungus 被引量:1
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作者 ZHANG Li-mei CHEN Shu-ting +9 位作者 QI Min CAO Xue-qi LIANG Nan LI Qian TANG Wei LU Guo-dong ZHOU Jie YU Wen-ying WANG Zong-hua ZHENG Hua-kun 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2021年第11期2944-2956,共13页
Autophagy is responsible for maintaining fundamental cellular homeostasis and is,therefore,essential for diverse development processes.This study reported that PoElp3,the putative catalytic subunit of Elongator comple... Autophagy is responsible for maintaining fundamental cellular homeostasis and is,therefore,essential for diverse development processes.This study reported that PoElp3,the putative catalytic subunit of Elongator complex,is involved in the maintenance of autophagy homeostasis to facilitate asexual development and pathogenicity in the rice blast fungus Pyricularia oryzae.It was found that the ΔPoelp3 strains were defective in vegetative growth,conidiation,stress response,and pathogenicity.The mutants exhibited hyper-activated autophagy in the vegetative hyphae under both nutrient-rich and nutrient-deficient conditions.The hyper-activation of autophagy possibly suppressed the production of vegetative hyphae in the ΔPoelp3 strains.Moreover,the ΔPoelp3 strains were found to be more sensitive to rapamycin during vegetative-and invasive-hyphal growth but have no effect on Target-of-Rapamycin(TOR)signaling inhibition.Taken together,these results demonstrated that PoElp3 is involved in asexual development and pathogenicity by regulating autophagy in the rice blast fungus. 展开更多
关键词 elongator ELP3 AUTOPHAGY asexual development PATHOGENICITY Pyricularia oryzae
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Photosynthesis-Dependent Extracellular Ca2+ Influx Triggers an Asexual Reproductive Cycle in the Marine Red Macroalga Porphyra yezoensis 被引量:1
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作者 Megumu Takahashi Naotsune Saga Koji Mikami 《American Journal of Plant Sciences》 2010年第1期1-11,共11页
Asexual propagation to increase the number of gametophytic clones via the growth of asexual haploid spores is a unique survival strategy found in marine multicellular algae. However, the mechanisms regulating the asex... Asexual propagation to increase the number of gametophytic clones via the growth of asexual haploid spores is a unique survival strategy found in marine multicellular algae. However, the mechanisms regulating the asexual life cycle are largely unknown. Here, factors involved in the regulation of production and discharge of asexual spores, so-called monospores, are identified in the marine red macroalga Porphyra yezoensis. First, enhanced discharge of monospores was found by incubation of gametophytes in ASPMT1, a modified version of the previously established synthetic medium ASP12. Comparison of the compositions of ASPMT1 and our standard medium, ESL, indicated that the Ca2+ concentration in ASPMT1 was three times lower than that in ESL medium. Thus, we modified ASPMT1 by increasing its Ca2+ concentration, resulting in reduction of monospore discharge. These findings demonstrate the role of reduced Ca2+ concentrations in enhancing monospore production and release. Moreover, it was also observed that initiation of asexual life cycle required illumination, was repressed by DCMU, and was induced by a Ca2+ ionophore in the dark. Taken together, these results indicate that photosynthesis-dependent Ca2+ influx triggers the asexual life cycle by promoting the production and discharge of monospores in P. yezoensis. 展开更多
关键词 asexual Life Cycle Bangiophyceae CA2+ INFLUX Monospore PHOTOSYNTHESIS Porphyra YEZOENSIS Rhodophyta Synthetic Medium
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Vegetative Compatibility and Asexual Recombination in Magnaporthe grisea from Jiangsu Province, China
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作者 WANG Yan-li, ZHANG Zheng-guang and ZHENG Xiao-bo(The Key Laboratory of Monitoring and Management of Plant Diseases and Insects , Ministry of Agriculture/College of Plant Protection, Nanjing Agricultural University , Nanjing 210095 , P.R.China) 《Agricultural Sciences in China》 CAS CSCD 2003年第7期768-772,共5页
Vegetative compatibility among isolates of different races in Magnaporthe grisea collected from Jiangsu Province and asexual recombination among compatible isolates by anastomosis were tested. Twenty isolates involvin... Vegetative compatibility among isolates of different races in Magnaporthe grisea collected from Jiangsu Province and asexual recombination among compatible isolates by anastomosis were tested. Twenty isolates involving seven races from diseased rice plants were paired on polished rice rose bengal medium and incubated at 25℃ in darkness for 18 days. Among 173 pairings tested, solid hyphal fusion lines formed by anastomosis between 124 pairings, indicated that these isolates were vegetative compatible with each other. The result showed that most M. grisea isolates were vegetative compatible. Furthermore, 17 vegetative compatible pairings between monoconidial isolates with MBCsIPTr marker and isolates with MBCrIPTs marker were selected to detect the asexual recombination between the compatible isolates of different races. The asexual recombinants with MBCrIPTr marker were detected in single hyphal fragment progenies in thirteen of the seventeen pairings. The percentage of recombinants was about 0. 6 -11.3%. Results showed that vegetative compatibility was prevailing among isolates of M. grisea in Jiangsu Province in vitro. These results also suggested that asexual recombination may be an important mechanism for M. grisea to maintain genetic diversity in nature. 展开更多
关键词 Magnaporthe grisea Vegetative compatibility asexual recombination
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Influences of Different Habitats on Asexual Propagation of Wild Gastrodia elata f. glauca being Domesticated in Ganzi
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作者 Xueqiang XIE 《Agricultural Science & Technology》 CAS 2015年第10期2111-2114,共4页
[Objective] The influences of different habitats on asexual propagation of wild Geg(abbreviation for Gastrodia elata Bl. f. glauca S. Chow) being domesticated in Ganzi prefecture was studied. [Method] The research tri... [Objective] The influences of different habitats on asexual propagation of wild Geg(abbreviation for Gastrodia elata Bl. f. glauca S. Chow) being domesticated in Ganzi prefecture was studied. [Method] The research trial was carried out in the following three kinds of habitats at the same time: the plastic greenhouses, the birch forest of shady slope and the shrubbery of sunny slope, and the results were analyzed with group data average hypothesis test method. [Result] The overall tuber(the juvenile tuber, the immature tuber and the mature tuber) yield and the mature tuber yield were both very significantly higher in the plastic greenhouses than in the other two types of habitats, and respectively reached 9.52 and 6.70 kg/m2; the mature tuber drying rate was dramatically or very dramatically lower in the plastic greenhouses than in the other two types of habitats, and was 23.84%; the stabilities of the overall tuber yield, the mature tuber yield and the drying rate were all reduced in the order of greenhouses, birch forest and shrubbery; and the dry mature tuber yield of the plastic greenhouses was the highest in the three kinds of habitats, and was 1.60 kg/m2. [Conclusion] A good habitat had to be created or chosen in the domesticating cultivation of the wild Geg in Ganzi prefecture. The preferred choice was the plastic greenhouse, the alternative one was the deciduous broadleaved forest of shady slope. The imitating wild planting of the wild Geg should be done in the warm moist deciduous broad-leaved forest of shady slope. 展开更多
关键词 HABITAT Gastrodia elata BI. f. glauca S. Chow asexual propagation Domesticating cultivation Imitating wild planting Overall tuber yield sum Mature tu- ber yield Drying rate
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Effect of Tree Species and Dosage of Rhizomorph Wood on Asexual Propagation of Wild Gastrodia elata. Bl. f. glauca S. Chow in Ganzi
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作者 Xueqiang XIE 《Agricultural Science & Technology》 CAS 2015年第9期1840-1844,共5页
The effects of the tree species and the dosages of Armillariella mellea rhizomoph wood on asexual propagation of wild Gastrodia elata Bl. f. glauca S. Chow were studied in Ganzi prefecture. The results showed that tre... The effects of the tree species and the dosages of Armillariella mellea rhizomoph wood on asexual propagation of wild Gastrodia elata Bl. f. glauca S. Chow were studied in Ganzi prefecture. The results showed that tree species had a very significant effect on asexual reproduction yield of wild Gastrodia elata Bl. f. glauca S. Chow. The drying rate and yield of Gastrodia elata Bl. f. glauca S. Chow cultured by close grained woods such as Quercus spinosa David ex Fr. was extremely significant higher than that cultured by coarse grained wood such as Betula platyphylla Suk. The dosage had a very significant effect on the yield of wild Gastrodia elata Bl. f. glauca S. Chow whereas it had no influence on the drying rate. 展开更多
关键词 Tree species of Armillariella mellea rhizomoph wood Dosage of Armil- lariella mellea rhizomorph wood Gastrodia elata BI. f. glauca S. Chow asexual propagation Yield Drying rate
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<i>In Vitro</i >Culture of <i>Plasmodium falciparum</i>: Obtention of Synchronous Asexual Erythrocytic Stages
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作者 María Roncalés Jaume Vidal +1 位作者 Pedro A. Torres Esperanza Herreros 《Open Journal of Epidemiology》 2015年第1期71-80,共10页
Cultivation of the erythrocytic stages of Plasmodium parasites, specifically the most important and deadly for humans, Plasmodium falciparum, has required a lot of effort and time in order to develop a continuous in v... Cultivation of the erythrocytic stages of Plasmodium parasites, specifically the most important and deadly for humans, Plasmodium falciparum, has required a lot of effort and time in order to develop a continuous in vitro culture. Moreover, the development of methods to synchronize P. falciparum parasites (which grow asynchronously in vitro) has become an essential tool in research to study different immulogical, biochemical or physiological aspects of the parasite. We have compared two different synchronization methods, one based on differential permeability of the membrane of parasitized erythrocytes, and the other on the sedimentation behavior in gelatin solution. An optimized method has been established which allows for maintaining a healthy, highly synchronous culture for longer periods of time. Asexual erythrocytic stages of a complete P. falciparum cycle have been obtained, which is the starting point of the stage-specific assays of the activity of new antimalarial drugs. 展开更多
关键词 P. FALCIPARUM SYNCHRONOUS asexual Stages Stage SPECIFICITY
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Scale Breeding and Reproduction Technique of Ficus tikoua Bur.Container Seedlings
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作者 Tinghong TAN Fan GAO +5 位作者 Yang XIAO Mingxing DAI Shunping BAI Shimei LIAO Chaojun FENG Chunfang WU 《Plant Diseases and Pests》 CAS 2023年第5期16-18,23,共4页
Based on the principle of asexual reproduction,a kind of scale breeding and reproduction technique of Ficus tikoua Bur.container seedlings was explored by using the characteristics of strong adaptability to the enviro... Based on the principle of asexual reproduction,a kind of scale breeding and reproduction technique of Ficus tikoua Bur.container seedlings was explored by using the characteristics of strong adaptability to the environment and fast growth and reproduction.Using non-woven bag as a breeding container for seedlings,the scale breeding and reproduction technique of F.tikoua container seedlings was summarized through the important links of seedling bed construction,seedling collection,soil configuration,container selection,cutting cultivation,field management,and disease and pest control.This technique can achieve differential,massive and sustainable efficient breeding and reproduction of F.tikoua seedlings in a short time. 展开更多
关键词 Ficus tikoua Bur Pharmaceutical/food resource asexual reproduction Container seedling Scale breeding and reproduction
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Biomass Allocation of Scirpus mariqueter Along an Elevational Gradient in a Salt Marsh of the Yangtse River Estuary 被引量:11
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作者 孙书存 蔡永立 刘红 《Acta Botanica Sinica》 CSCD 2001年第2期178-185,共8页
Scirpus mariqueter Tang et Zhang is a typical pioneer plant colonizing the bare beaches of the Yangtse River estuary. To explore the life history strategy of the species with reference to environmental physical stre... Scirpus mariqueter Tang et Zhang is a typical pioneer plant colonizing the bare beaches of the Yangtse River estuary. To explore the life history strategy of the species with reference to environmental physical stress, the biomass allocations to different plant components and some related morphological parameters were examined along an elevational gradient within a salt marsh. Authors found that S. mariqueter performed best at medium elevation within the marsh, with relatively high density of shoot and individual ramet dry mass. Biomass allocation to corm was the highest at low elevations, and the least at high elevations, suggesting that a conservative strategy was adopted by the species to cope with the harsh physical conditions at the low elevation. The investment in rhizome decreased from low to high elevations, while the proportion of inflorescence mass increased, indicating that during the life history, the species shifts from predominant asexual reproduction to predominant sexual reproduction. This may be favourable for the species to colonize larger area, and to spread and persist at a meta_population level. Correlation analyses showed that sexual reproduction was inversely related to growth and asexual reproduction. However, it is difficult to determine the relationship between asexual reproduction and growth possibly because of the varied function of the corms of the species in different life history stages. 展开更多
关键词 asexual reproduction CORM salt marsh sexual reproduction life history strategy trade_off
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Molecular identification and culture observation on Acrochaete leptochaete (Chaetophoraceae, Chlorophyta) from China 被引量:3
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作者 邓蕴彦 汤晓荣 +2 位作者 黄冰心 滕林宏 丁兰平 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2012年第3期476-484,共9页
Acrochaete leptochaete (Huber) Nielsen (Chaetophoraceae, Chlorophyta) was isolated from the macroalgae Chaetomorpha collected from intertidal pools in Rongcheng, Shandong, China. 18S rDNA combined with ITS regions... Acrochaete leptochaete (Huber) Nielsen (Chaetophoraceae, Chlorophyta) was isolated from the macroalgae Chaetomorpha collected from intertidal pools in Rongcheng, Shandong, China. 18S rDNA combined with ITS regions were used to ascertain the morphological identification of the isolated material. Based on the unialgal culture, asexual reproduction and growth characteristics of A. leptochaete were investigated over wide ranges of temperature and irradiance. Results revealed that asexual reproduction of A. leptochaete could be realized by biflagellate zoospores. The zoospores germinated directly to give self- replicating generations. Zoospore germination was bipolar. A temperature range from 13-21 ℃ and a lower irradiance of 36 μmol/(m2.s) were most favorable for the growth ofA. leptochaete. Thallus organization, an important taxonomic criterion for the genus Acrochaete, was affected markedly by temperature and irradiance. Our results extend the knowledge about the species' general biology and its morphological plasticity. For classification and identification of a simple microphytic algae like A. leptochaete, which are traditionally placed in the class Chaetophoraceae, we propose that molecular tools associated with culture observations are applied. 展开更多
关键词 Acrochaete leptochaete asexual reproduction culture observation growth characteristics molecular identification
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Genetic Diversity of the Pepper Pathogen <i>Phytophthora capsici</i>on Farms in the Amazonian High Jungle of Peru 被引量:1
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作者 Jon Hulvey Oscar Hurtado-Gonzalez +4 位作者 Liliana Aragón-Caballero Daniel Gobena Dylan Storey Ledare Finley Kurt Lamour 《American Journal of Plant Sciences》 2011年第3期461-466,共6页
Phytophthora capsici is an important oomycete pathogen of Capsicum peppers worldwide. Populations of P. capsici recovered from coastal regions in Peru were previously shown to be dominated by a single clonal lineage r... Phytophthora capsici is an important oomycete pathogen of Capsicum peppers worldwide. Populations of P. capsici recovered from coastal regions in Peru were previously shown to be dominated by a single clonal lineage referred to as PcPE-1. During 2008, 219 isolates of P. capsici were collected from Capsicum pubescens (Rocoto), C. annum (Pimento), and C. baccatum (Aji) at 9 farms in the Amazonian high jungle in the areas surrounding Oxapampa, and one coastal location, Carabayllo. Two isolates of P. capsici were also recovered from Cyclanthera pedata (Caigua fruit) near one field. All isolates were characterized using a panel of eight single nucleotide polymorphism (SNP) markers that are fixed for heterozygosity in the PcPE-1 lineage. A subset of isolates was also characterized using amplified fragment length polymorphism (AFLP) markers. Nine discreet SNP multi-locus genotypes were identified, and the PcPE-1 lineage was recovered from all of the field sites. Both A1 and A2 mating types were recovered from two sites. The implications of the genotypic diversity and distribution identified in this study are discussed. 展开更多
关键词 Population Genetics DNA Markers CLONALITY asexual REPRODUCTION Sexual REPRODUCTION
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Advances in Research of Cutting Breeding Technology of Xanthoceras sorbifolium Bunge
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作者 Tao LIU Mei YU +5 位作者 Lei WANG Dan WU Xiaoman XIE Zhen WANG Xueyong ZHANG Yongjun ZHAO 《Asian Agricultural Research》 2020年第6期43-48,52,共7页
Cutting breeding is an important method of asexual reproduction of Xanthoceras sorbifolium Bunge.At present,it has been found that the factors influencing the cuttings of X.sorbifolium mainly include cutting material ... Cutting breeding is an important method of asexual reproduction of Xanthoceras sorbifolium Bunge.At present,it has been found that the factors influencing the cuttings of X.sorbifolium mainly include cutting material type,substrate type,cutting season,cutting material length and thickness,mother tree age,cutting material pretreatment method,hormone species concentration and soaking time.Besides,different regions,control conditions,and germplasm types have different cutting rooting rates.This paper introduced some of the problems in the cuttings of X.sorbifolium,and came up with some recommendations to provide a reference for the future research and technical promotion of X.sorbifolium cuttings. 展开更多
关键词 Xanthoceras sorbifolium Bunge CUTTING Rooting rate asexual reproduction Research advances
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Indolbutyric Acid and Time of the Year Influence on Rooting of Chrysanthemum Cuttings
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作者 Marina Romano Nogueira Marcos Vieira Ferraz +5 位作者 Amanda Kelly Dias Bezerra Renata Bachin Mazzini-Guedes Carla Rafaele Xavier Costa Lívia Caroline Praseres de Almeida Suzana Targanski Sajovic Pereira Kathia Fernandes Lopes Pivetta 《American Journal of Plant Sciences》 2018年第3期507-516,共10页
The objective of this study was to analyze the effect of the seasons and indol butyric acid (IBA), as well as the preparation of IBA solutions on rooting growth of “Fine Time” chrysanthemum cuttings. The first exper... The objective of this study was to analyze the effect of the seasons and indol butyric acid (IBA), as well as the preparation of IBA solutions on rooting growth of “Fine Time” chrysanthemum cuttings. The first experiment was arranged in a 4 × 2 factorial scheme: IBA concentrations (0, 1000, 2000 and 3000 mg·L-1) during summer and winter with 4 replicates of two pots and six cuttings per pot. In the second experiment, the storage of IBA solution (1000 mg·L-1) at 15°C was studied with four replicates of 10 cuttings per plot in a period of four weeks. In the third experiment, dilution and supply of IBA (1000 mg·L-1 or 1000 mg·kg-1) were studied;there were eight treatments: (1) IBA mixed with industrial talc;(2) IBA diluted in 50% alcohol and oven dried at 30°C;(3) IBA diluted in 50% alcohol and oven dried at 70°C;(4) IBA diluted in NaOH and supplied via aqueous solution;(5) IBA diluted in acetone and supplied via aqueous solution;(6) IBA diluted in alcohol 92.8% and supplied via alcoholic solution;(7) IBA diluted in alcohol 50% and supplied via alcoholic solution;(8) IBA mixed and supplied via lanolin;with four replicates of 10 cuttings per plot. Twenty-one days after cutting implementation, the following variables were evaluated: rooting percentage, number, average length and root dry mass. Statistical analysis and time-of-year averages were compared using the Tukey test at 5%;polynomial regression for IBA concentration and preparation data. The means of dilution and delivery were compared by the Scott-Knott test. Treatment with IBA at a concentration of 3000 mg·kg-1 resulted in 90% rooting in the winter and 100% in the summer for all treatments. Results suggest the concentration of 2000 mg·L-1 in the summer and 2000 and 3000 mg·L-1 during the winter provided better quality for the root system. Cuttings treated with IBA diluted in 50% alcohol and oven dried at 30°C showed higher number, length and vigor of the roots. 展开更多
关键词 DENDRANTHEMA grandiflora CUTTING asexual Propagation
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ASF1 regulates asexual and sexual reproduction in Stemphylium eturmiunum by DJ-1 stimulation of the PI3K/AKT signaling pathway
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作者 Shi Wang Xiaoman Liu +8 位作者 Chenlin Xiong Susu Gao Wenmeng Xu Lili Zhao Chunyan Song Xiaoyong Liu Timothy Y.James Zhuang Li Xiuguo Zhang 《Fungal Diversity》 SCIE 2023年第6期159-176,共18页
Most fungi display a mixed mating system with both asexual and sexual reproduction.The timing of the two modes of reproduction must be carefully coordinated through signal perception and coordination in the cell along... Most fungi display a mixed mating system with both asexual and sexual reproduction.The timing of the two modes of reproduction must be carefully coordinated through signal perception and coordination in the cell along with chromatin modification.Here,we investigated coordination of reproductive output by investigating the function of the histone chaper-one anti-silencing factor 1(ASF1)in a fungal species amenable to characterization of both asexual and sexual reproduction.We used knockout approach to show that SeASF1 influenced asexual and sexual reproduction in Stemphylium eturmiunum.SeASF1-deleted strains failed to produce pseudothecia,but produce abnormal conidia and showed an irregular distribution of nuclei in mycelium.Transcriptome sequencing was then used to identify genes with altered expression in the SeASF1-deleted strains.The transcriptional expression of the identified SeDJ-1 was strongly regulated by SeASF1.The interaction of SeDJ-1 and SeASF1 was confirmed using Y2H,Co-IP,and pull-down.Due to some components of phosphatidylinositol 3-kinase/protein kinase B(PI3K/AKT)signaling pathway were known to interact with DJ-1 in mammals,we verified SePI3K,an element of PI3K/AKT signaling pathway in S.eturmiunum,was directly linked to SeDJ-1 and then these two proteins were defined as a coordinator of reproduction.However,knockout of SeDJ-1 or SePI3K altered the asexual and sexual repro-duction,but SePI3K recovered the asexual and sexual development of∆Sedj-1.The SeDJ-1-M6 segment of SeDJ-1 was essential for its interaction with SePI3K and played a critical role in restoring sexual reproduction in the∆Sepi3k,providing a deep understanding of the regulatory mechanism of SeDJ-1 in S.eturmiunum development.Summarily,SeASF1 is able to trigger SeDJ-1 and SeDJ-1can also activate SePI3K,which is orchestrally involved in asexual and sexual reproduction in S.eturmiunum.All these results reveal that SeASF1 manipulates asexual and sexual reproduction in S.eturmiunum by SeDJ-1 perception of PI3K/AKT signaling pathway.These data highlight the deep similarities in coordinating asexual and sexual processes in both fungi and eukaryotes in general. 展开更多
关键词 ASF1 DJ-1 Stemphylium eturmiunum PI3K/AKT signaling pathway asexual and sexual reproduction
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Growth and Quality of Clonal Plantlets of Conilon Coffee(Coffea canephora Pierre ex A.Froehner)Influenced by Types of Cuttings
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作者 Abraao Carlos Verdin Filho Aldo Luiz Mauri +6 位作者 Paulo Sergio Volpi Aymbire Francisco Almeida da Fonseca Romario Gava Ferrao Maria Amelia Gava Ferrao Wagner Nunes Rodrigues Saul de Andrade Júnior Tafarel Victor Colodetti 《American Journal of Plant Sciences》 2014年第14期2148-2153,共6页
To achieve high crop yieldin agriculture, the production of plantlets of superior quality is one of thebasic prerequisites. For conilon coffee, the current recommendation in theproduction of clonal plantlets through v... To achieve high crop yieldin agriculture, the production of plantlets of superior quality is one of thebasic prerequisites. For conilon coffee, the current recommendation in theproduction of clonal plantlets through vegetative propagation is to usediagonal cuttings, in bevel form. However, there are indications that othertypes of cutting have been successfully used to produce plantlets. In thiscontext, this experiment was conducted with the objective of studying thedevelopment of plantlets of conilon coffee obtained by different types ofcuttings. The experiment was conducted in a greenhouse. The cuttings wereobtained from the middle portion of orthotropic stems of standardized plants.The experiment followed a split plot in time design, with three types ofcuttings (bevel, sharp bevel and straight) and two times of evaluation, withfour repetitions. At 30 and 120 days after planting, plantlets were collectedand evaluated. The results show the increase occurred in the variables due tothe straight cut when compared to the others, except for stem diameter.Emphasizing in this context, the straight cut promoted an increase in seedlingheight, production of biomass and in the Dickson’s quality index when comparedto cuttings in bevel and sharp bevel. 展开更多
关键词 Coffea canephora asexual Propagation Vegetative Propagation MULTIPLICATION
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Different Responses of Sexual and Asexual Reproduction of Arundinella hirta to Flooding 被引量:3
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作者 Zeng Bo Fu Tianfei +1 位作者 Ulrich Schurr Arnd J.Kuhn 《Frontiers in Biology》 CSCD 2006年第1期46-49,共4页
The sexual and asexual reproductive features of the graminoid species Arundinella hirta growing at riversides of the Jialing River were analyzed.It was found that the total seed mass,seed number per plant,and sexual r... The sexual and asexual reproductive features of the graminoid species Arundinella hirta growing at riversides of the Jialing River were analyzed.It was found that the total seed mass,seed number per plant,and sexual reproductive allocation of A.hirta decreased with decreasing bank elevation,and plants growing at the lowest elevations of banks subjected to intense flooding did not show sexual reproduction.The total plant biomass and the number of ramifications per plant increased with flooding intensity,which implies that,contrary to sexual reproduction,asexual reproduction of A.hirta was enhanced by flooding. 展开更多
关键词 Arundinella hirta asexual reproduction FLOODING reproductive allocation sexual reproduction
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