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Different genotypes regulate the microbial community structure in the soybean rhizosphere 被引量:1
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作者 QU Zheng LI Yue-han +3 位作者 XU Wei-hui CHEN Wen-jing HU Yun-long WANG Zhi-gang 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2023年第2期585-597,共13页
The soybean rhizosphere has a specific microbial community,but the differences in microbial community structure between different soybean genotypes have not been explained.The present study analyzed the structure of t... The soybean rhizosphere has a specific microbial community,but the differences in microbial community structure between different soybean genotypes have not been explained.The present study analyzed the structure of the rhizosphere microbial community in three soybean genotypes.Differences in rhizosphere microbial communities between different soybean genotypes were verified using diversity testing and community composition,and each genotype had a specific rhizosphere microbial community composition.Co-occurrence network analysis found that different genotype plant hosts had different rhizosphere microbial networks.The relationship between rhizobia and rhizosphere microorganisms in the network also exhibited significant differences between different genotype plant hosts.The ecological function prediction found that different genotypes of soybean recruited the specific rhizosphere microbial community.These results demonstrated that soybean genotype regulated rhizosphere microbial community structure differences.The study provides a reference and theoretical support for developing soybean microbial inoculum in the future. 展开更多
关键词 SOYBEAN rhizosphere GENOTYPE microbial community host plants
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Heavy metal (Pb,Zn) uptake and chemical changes in rhizosphere soils of four wetland plants with different radial oxygen loss 被引量:12
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作者 Junxing Yang Zuoluo Ma +2 位作者 Zhihong Ye Xueyan Guo Rongliang Qiu 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2010年第5期696-702,共7页
Lead and Zn uptake and chemical changes in rhizosphere soils of four emergent-rooted wetland plants;Aneilema bracteatum,Cyperus alternifolius,Ludwigia hyssopifolia and Veronica serpyllifolia were investigated by two e... Lead and Zn uptake and chemical changes in rhizosphere soils of four emergent-rooted wetland plants;Aneilema bracteatum,Cyperus alternifolius,Ludwigia hyssopifolia and Veronica serpyllifolia were investigated by two experiments:(1) rhizobag filled with "clean" or metal-contaminated soil for analysis of Pb and Zn in plants and rhizosphere soils;and (2) applied deoxygenated solution for analyzing their rates of radial oxygen loss (ROL).The results showed that the wetland plants with different ROL rates had significant effects on the mobility and chemical forms of Pb and Zn in rhizosphere under flooded conditions.These effects were varied with different metal elements and metal concentrations in the soils.Lead mobility in rhizosphere of the four plants both in the "clean" and contaminated soils was decreased,while Zn mobility was increased in the rhizosphere of the "clean" soil,but decreased in the contaminated soil.Among the four plants,V.serpyllifolia,with the highest ROL,formed the highest degree of Fe plaque on the root surface,immobilized more Zn in Fe plaque,and has the highest effects on the changes of Zn form (EXC-Zn) in rhizosphere under both "clean" and contaminated soil conditions.These results suggested that ROL of wetland plants could play an important role in Fe plaque formation and mobility and chemical changes of metals in rhizosphere soil under flood conditions. 展开更多
关键词 LEAD ZINC rhizosphere wetland plant radial oxygen loss
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Characterization of Bacterial Community Structure and Diversity in Rhizosphere Soils of Three Plants in Rapidly Changing Salt Marshes Using 16S rDNA 被引量:18
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作者 WANG Meng CHEN Jia-Kuan LI Bo 《Pedosphere》 SCIE CAS CSCD 2007年第5期545-556,共12页
The structure and diversity of the bacterial communities in rhizosphere soils of native Phragmites australis and Scirpus rnariqueter and alien Spartina alterniflora in the Yangtze River Estuary were investigated by co... The structure and diversity of the bacterial communities in rhizosphere soils of native Phragmites australis and Scirpus rnariqueter and alien Spartina alterniflora in the Yangtze River Estuary were investigated by constructing 16S ribosomal DNA (rDNA) clone libraries. The bacterial diversity was quantified by placing the clones into operational taxonomic unit (OTU) groups at the level of sequence similarity of 〉 97%. Phylogenetic analysis of the resulting 398 clone sequences indicated a high diversity of bacteria in the rhizosphere soils of these plants. The members of Alphaproteobacteria, Betaproteobacteria, Gammaproteobacteria, and Deltaproteobacteria of the phylum Proteobacteria were the most abundant in rhizobacteria. Chao 1 nonpaxametric diversity estimator coupled with the reciprocal of Simpson's index (l/D) was applied to sequence data obtained from each library to evaluate total sequence diversity and quantitatively compare the level of dominance. The results showed that Phragmites, Scirpus, and Spartina rhizosphere soils contained 200, 668, and 382 OTUs, respectively. The bacterial communities in the Spartina and Phragraites rhizosphere soils displayed species dominance revealed by 1/D, whereas the bacterial community in Scirpus rhizosphere soil had uniform distributions of species abundance. Overall, analysis of 16S rDNA clone libraries from the rhizosphere soils indicates that the changes in bacterial composition may occur concomitantly with the shift of species composition in plant communities. 展开更多
关键词 16S rDNA bacterial diversity plant succession rhizosphere salt marshes
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Seasonal comparison of bacterial communities in rhizosphere of alpine cushion plants in the Himalayan Hengduan Mountains 被引量:4
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作者 Shuai Chang Jianguo Chen +2 位作者 Jianqiang Su Yang Yang Hang Sun 《Plant Diversity》 SCIE CAS CSCD 2018年第5期209-216,共8页
Positive associations between alpine cushion plants and other species have been extensively studied.However,almost all studies have focused on the associations between macrofauna.Studies that have investigated positiv... Positive associations between alpine cushion plants and other species have been extensively studied.However,almost all studies have focused on the associations between macrofauna.Studies that have investigated positive associations between alpine cushion plants and rhizospheric microbes have been limited to the vegetation growing season.Here,we asked whether the positive effects that alpine cushion plants confer on rhizospheric microbe communities vary with seasons.We assessed seasonal variations in the bacterial diversity and composition in rhizosphere of two alpine cushion plants and surrounding bare ground by employing a high throughput sequencing method targeting the V3 region of bacterial 16 S rRNA genes.Soil properties of the rhizosphere and the bare ground were also examined.We found that cushion rhizospheres harbored significantly more C,N,S,ammonia nitrogen,and soil moisture than the bare ground.Soil properties in cushion rhizospheres were not notably different,except for soil pH.Bacterial diversities within the same microhabitats did not vary significantly with seasons.We concluded that alpine cushion plants had positive effects on the rhizospheric bacterial communities,even though the strength of the effect varied in different cushion species.Cushion species and the soil sulfur content were probably the major factors driving the spatial distribution and structure of soil bacterial communities in the alpine communities dominated by cushion plants. 展开更多
关键词 ALPINE Cushion plant Positive effect rhizosphere BACTERIA Soil nutrient
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Plant growth-promoting properties and anti-fungal activity of endophytic bacterial strains isolated from Thymus altaicus and Salvia deserta in arid lands
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作者 ZHAO Mengqi SU Huan +5 位作者 HUANG Yin Rashidin ABDUGHENI MA Jinbiao GAO Jiangtao GUO Fei LI Li 《Journal of Arid Land》 SCIE CSCD 2023年第11期1405-1420,共16页
Endophytes,as crucial components of plant microbial communities,significantly contribute to enhancing the absorption of nutrients such as nitrogen and phosphorus by their hosts,promote plant growth,and degrade pathoge... Endophytes,as crucial components of plant microbial communities,significantly contribute to enhancing the absorption of nutrients such as nitrogen and phosphorus by their hosts,promote plant growth,and degrade pathogenic fungal mycelia.In this study,an experiment was conducted in August 2022 to explore the growth-promoting potential of endophytic bacterial strains isolated from two medical plant species,Thymus altaicus and Salvia deserta,using a series of screening media.Plant samples of Thymus altaicus and Salvia deserta were collected from Zhaosu County and Habahe County in Xinjiang Uygur Autonomous Region,China,in July 2021.Additionally,the inhibitory effects of endophytic bacterial strains on the four pathogenic fungi(Fusarium oxysporum,Fulvia fulva,Alternaria solani,and Valsa mali)were determined through the plate confrontation method.A total of 80 endophytic bacterial strains were isolated from Thymus altaicus,while a total of 60 endophytic bacterial strains were isolated from Salvia deserta.The endophytic bacterial strains from both Thymus altaicus and Salvia deserta exhibited plant growth-promoting properties.Specifically,the strains of Bacillus sp.TR002,Bacillus sp.TR005,Microbacterium sp.TSB5,and Rhodococcus sp.TR013 demonstrated strong cellulase-producing activity,siderophore-producing activity,phosphate solubilization activity,and nitrogen-fixing activity,respectively.Out of 140 endophytic bacterial strains isolated from Thymus altaicus and Salvia deserta,104 strains displayed anti-fungal activity against Fulvia fulva,Alternaria solani,Fusarium oxysporum,and Valsa mali.Furthermore,the strains of Bacillus sp.TR005,Bacillus sp.TS003,and Bacillus sp.TSB7 exhibited robust inhibition rates against all the four pathogenic fungi.In conclusion,the endophytic bacterial strains from Thymus altaicus and Salvia deserta possess both plant growth-promoting and anti-fungal properties,making them promising candidates for future development as growth-promoting agents and biocontrol tools for plant diseases. 展开更多
关键词 endophytic bacteria Thymus altaicus Salvia deserta pathogenic fungi plant growth-promoting properties anti-fungal activity
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Application of PCR primer sets for detection of <i>Pseudomonas</i>sp. functional genes in the plant rhizosphere 被引量:2
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作者 Jong-Shik Kim Pauline M. Mele David E. Crowley 《Journal of Agricultural Chemistry and Environment》 2013年第1期8-15,共8页
Plant growth promoting pseudomonads play an important role in disease suppression and there is considerable interest in development of bio-marker genes that can be used to monitor these bacteria in agricultural soils.... Plant growth promoting pseudomonads play an important role in disease suppression and there is considerable interest in development of bio-marker genes that can be used to monitor these bacteria in agricultural soils. Here, we report the application ofa PCR primer sets targeting genes encoding the main antibiotic groups. Distribution of the genes was variably distributed across type strains of 28 species with no phylogenetic groupingfor the detected antibioticsgenes, phlD for 2,4-diacetylphloroglucinol (2,4-DAPG) and phzCD for phenazine-1-carboxylic acid or hcnBC for hydrogen cyanide production. Analysis of field soils showed that primer sets for phlD and phzCD detected these genes in a fallowed neutral pH soil following wheat production, but that the copy numbers were below the detection limits in bulk soils having an acidic pH. In contrast, PCR products for the phzCD, pltc and hcnBc genes were detectable in mature root zones following plantingwith wheat. The ability to rapidly characterize populations of antibiotics producers using specific primer sets will improve our ability to assess the impacts of management practices on the functional traits of Pseudomonas spp. populations in agricultural soils. 展开更多
关键词 PGPR (plant growth-promotING rhizosphere) PSEUDOMONAS PCR 16S rDNA plant-Microbe Interactions
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Genotypic Difference of Plants in K-Enrichment Capability and the Distribution of K in Plant Rhizosphere 被引量:1
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作者 YANWEIDONG SHIWEIMNG 《Pedosphere》 SCIE CAS CSCD 1997年第2期165-170,共6页
Plant genotypic difference of pot assiu m-enr ich ment capab ility and p ot assi um (K ) d ist rib ut ion at root-soil ioterface of different plant genotypes were studied by using seven plant species and eight varieti... Plant genotypic difference of pot assiu m-enr ich ment capab ility and p ot assi um (K ) d ist rib ut ion at root-soil ioterface of different plant genotypes were studied by using seven plant species and eight varieties oftobacco (Nicotiana tabacum L.). The results indicated that K enrichment capability was: Ethiopian guizotia(Guizotia abyssinica Cass.)>feather cockscomb (Celosia arpentea L.)>alligator alternanthera (Alternantheraphiloxeroides (Mart.) Griseb.)> tobacco>sesbania (Sesbania cannabina (Retz.) Pers.)>wheat (Thticumaestivum L.)>broadbean (Vicia faba L.). Ethiopian guizotia showed very high K-enrichment capability atdifferent soil K levels, and the K content in its dry matter was over 110 mg kg-1 when soil K was fullysupplied, and about 60 mg kg-1 when no K fertilizer was applied. For alligator alternanthera, the capabilityto accumulate K was closely related with its growth medium. When it was grown on soils, both the K contentand K uptake rate of the plant were similar to those of tobacco. Evident K dep1etion was observed in therhizosphere of all plant species, and the depletion rate was related to the capability of K enrichment of plant. 展开更多
关键词 K-enriched plants K enrichment rhizosphere tobacco (Nicotiana tabacum L.)
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Nitrification intensity and ammonia-oxidizing bacteria and archaea in different wetland plant rhizosphere soils 被引量:1
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作者 Yan Chunni Huang Juan +3 位作者 Yang Sisi Cao Chong Peng Cheng Li Runqing 《Journal of Southeast University(English Edition)》 EI CAS 2017年第4期466-472,共7页
In order to explore the nitrogen removal process in constructed wetlands(CW s),the moisture,ammonia nitrogen(NH4+-N),nitrate nitrogen(NO3"-N)and nitrification intensity in three wetland plant rhizosphere soils(Ac... In order to explore the nitrogen removal process in constructed wetlands(CW s),the moisture,ammonia nitrogen(NH4+-N),nitrate nitrogen(NO3"-N)and nitrification intensity in three wetland plant rhizosphere soils(Acorns calamus,Typha orientalis,Iris pseudacorus)were investigated at a relatively normal temperature range of15to25The relative abundance of ammonia-oxidizing bacteria(AOB)and ammonia-oxidizing archaea(AOA)were also achieved using fluorescence in situ hybridization(FISH).It is found that T.orientalis achieves the highest nitrification intensity of2.03m g(h?kg)while the second is I.pseudacorrs(1.74m g/(h?kg)),and followed by A.calamus(1.65m g/(h?kg))throughout the experiment.FISH reveals that the abundance of bacteria(1010g_1wet soil)is higher than that of archaea(109g_1wet soil),and AOBare the dominant bacteria in the ammonia oxidation process.The abundance of AOB in te rhizosphere soils from high to low T.orientalis(1.88x1010g"1),I pseudacorus(1.23x1010g1),A.calamus(5.07x109g"1)while the abundance of AOA from high to low ae I.pseudacorus(4.00x109g1),A.calamus(3.52x109g"1),T.orientalis(3.48x109g"1).The study provides valuable evidence of plant selection for nitrogen removal in CWs. 展开更多
关键词 wetland plant rhizosphere nitrification intensity ammonia-oxidizing bacteria ammonia-oxidizing archaea florescence in situ hybridization
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Response of nitrogen fractions in the rhizosphere and bulk soil to organic mulching in an urban forest plantation
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作者 Xiaodan Sun Gang Wang +3 位作者 Yuqian Ye Qingxu Ma Qingwei Guan Davey L.Jones 《Journal of Forestry Research》 SCIE CAS CSCD 2021年第6期2577-2588,共12页
Nitrogen is an essential component in forest ecosystem nutrient cycling.Nitrogen fractions,such as dissolved nitrogen,ammonium,nitrate,and microbial biomass nitrogen,are sensitive indicators of soil nitrogen pools whi... Nitrogen is an essential component in forest ecosystem nutrient cycling.Nitrogen fractions,such as dissolved nitrogen,ammonium,nitrate,and microbial biomass nitrogen,are sensitive indicators of soil nitrogen pools which affect soil fertility and nutrient cycling.However,the responses of nitrogen fractions in forest soils to organic mulching are less well understood.The rhizosphere is an important micro-region that must be considered to better understand element cycling between plants and the soil.A field investigation was carried out on the effect of mulching soil in a 15-year-old Ligustrum lucidum urban plantation.Changes in total nitrogen and nitrogen fractions in rhizosphere and bulk soil in the topsoil(upper 20 cm)and in the subsoil(20-40 cm)were evaluated following different levels of mulching,in addition to nitrogen contents in fine roots,leaves,and organic mulch.The relationships between nitrogen fractions and other measured variables were analysed.Organic mulching had no significant effect on most nitrogen fractions except for the rhizosphere microbial biomass nitrogen(MBN),and the thinnest(5 cm)mulching layer showed greater effects than other treatments.Rhizosphere MBN was more sensitive to mulching compared to bulk soil,and was more affected by soil environmental changes.Season and soil depth had more pronounced effects on nitrogen fractions than mulching.Total nitrogen and dissolved nitrogen were correlated to soil phosphorus,whereas other nitrogen fractions were strongly affected by soil physical properties(temperature,water content,bulk density).Mulching also decreased leaf nitrogen content,which was more related to soil nitrogen fractions(except for MBN)than nitrogen contents in either fine roots or organic mulch.Frequent applications of small quantities of organic mulch contribute to nitrogen transformation and utilization in urban forests. 展开更多
关键词 rhizosphere Nitrogen fraction Organic mulching Soil–plant interaction Urban plantation forest
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Different responses of soil fauna gut and plant rhizosphere microbiomes to manure applications
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作者 Shuai Du Xiang Zhao +2 位作者 Yue Zhang Changlong Shu Ju-Pei Shen 《Soil Ecology Letters》 CSCD 2024年第2期57-69,共13页
Microbial attributes were compared between soil fauna gut and plant rhizosphere.•Manure applications decreased or increased gut or rhizosphere bacterial diversity.•Stochastic or deterministic processes drove gut or rh... Microbial attributes were compared between soil fauna gut and plant rhizosphere.•Manure applications decreased or increased gut or rhizosphere bacterial diversity.•Stochastic or deterministic processes drove gut or rhizosphere bacterial assembly.•Manure applications increased bacterial network complexity of gut and rhizosphere.Diverse microbes inhabit animals and plants,helping their hosts perform multiple functions in agricultural ecosystems.However,the responses of soil fauna gut and plant rhizosphere microbiomes to livestock manure applications are still not well understood.Here we fed Protaetia brevitarsis larvae(PBL)with chicken manure and collected their frass.The frass and manure were applied as fertilizers to lettuce pots.We then compared the changes of microbial diversity,community assembly,and potential functions between the gut group(i.e.,all PBL gut and frass samples)and the rhizosphere group(i.e.,all rhizosphere soil samples).We revealed that manure applications(i.e.,feeding or fertilization)decreased bacterial diversity in the gut group but increased that in the rhizosphere group.Particularly,the proportions of Bacilli in the gut group and Gammaproteobacteria in the rhizosphere group were increased(up to a maximum of 33.8%and 20.4%,respectively)after manure applications.Stochastic and deterministic processes dominated community assembly in the gut and rhizosphere microbiomes,respectively.Manure applications increased the microbial co-occurrence network complexity of both the gut and rhizosphere groups.Moreover,the proportions of functional taxa associated with human/animal pathogens in the gut group and carbon/nitrogen cycling in the rhizosphere group were enhanced(up to 2.6-fold and 24.6-fold,respectively).Our findings illustrate the different responses of microbial diversity,community assembly,and potential functions in soil fauna gut and plant rhizosphere to manure applications.The results could enhance our knowledge on the reasonable utilization of animal and plant microbiomes in agricultural management. 展开更多
关键词 soil fauna gut plant rhizosphere manure applications community assembly microbial functions
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Root Exudates, Rhizosphere Zn Fractions, and Zn Accumulation of Ryegrass at Different Soil Zn Levels 被引量:23
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作者 XU Wei-Hong LIU Huai +1 位作者 MA Qi-Fu XIONG Zhi-Ting 《Pedosphere》 SCIE CAS CSCD 2007年第3期389-396,共8页
A glasshouse experiment was conducted using a root-bag technique to study the root exudates, rhizosphere Zn fractions, and Zn concentrations and accumulations of two ryegrass cultivars (Lolium perenne L. cvs. Airs an... A glasshouse experiment was conducted using a root-bag technique to study the root exudates, rhizosphere Zn fractions, and Zn concentrations and accumulations of two ryegrass cultivars (Lolium perenne L. cvs. Airs and Tede) at different soil Zn levels (0, 2, 4, 8, and 16 mmol kg^-1 soil). Results indicated that plant growth of the two cultivars was not advérsely affected at soil Zn level ≤ 8 mmol kg^-1. Plants accumulated more Zn as soil Zn levels increased, and Zn concentrations of shoots were about 540 μg g^-1 in Aris and 583.9 μg g^-1 in Tede in response to 16 mmol Zn kg^-1 soil. Zn ratios of shoots to roots across the soil Zn levels were higher in Tede than in Airs, corresponding with higher rhizosphere available Zn fractions (exchangeable, bound to manganese oxides, and bound to organic matter) in Airs than in Tede. Low-molecular-weight (LMW) organic acids (oxalic, tartaric, malic, and succinic acids) and amino acids (proline, threonine, glutamic acid, and aspartic acid, etc.) were detected in root exudates, and the concentrations of LMW organic acids and amino acids increased with addition of 4 mmol Zn kg^-1 soil compared with zero Zn addition. Higher rhizosphere concentrations of oxalic acid, glutamic acid, alanine, phenylalanine, leucine, and proline in Tede than in Airs likely resulted in increased Zn uptake from the soil by Tede than by Airs. The results suggested that genotypic differences in Zn accumulations were mainly because of different root exudates and rhizosphere Zn fractions. 展开更多
关键词 plant Zn accumulation rhizosphere Zn fractions root exudates RYEGRASS soil Zn level
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Plant growth-promoting rhizobacteria(PGPR)and its mechanisms against plant diseases for sustainable agriculture and better productivity 被引量:2
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作者 PRANAB DUTTA GOMATHY MUTHUKRISHNAN +12 位作者 SABARINATHAN KUTALINGAM GOPALASUBRAMAIAM RAJAKUMAR DHARMARAJ ANANTHI KARUPPAIAH KARTHIBA LOGANATHAN KALAISELVI PERIYASAMY MARUMUGAM PILLAI GK UPAMANYA SARODEE BORUAH LIPA DEB ARTI KUMARI MADHUSMITA MAHANTA PUNABATI HEISNAM AK MISHRA 《BIOCELL》 SCIE 2022年第8期1843-1859,共17页
Plant growth-promoting rhizobacteria(PGPR)are specialized bacterial communities inhabiting the root rhizosphere and the secretion of root exudates helps to,regulate the microbial dynamics and their interactions with t... Plant growth-promoting rhizobacteria(PGPR)are specialized bacterial communities inhabiting the root rhizosphere and the secretion of root exudates helps to,regulate the microbial dynamics and their interactions with the plants.These bacteria viz.,Agrobacterium,Arthobacter,Azospirillum,Bacillus,Burkholderia,Flavobacterium,Pseudomonas,Rhizobium,etc.,play important role in plant growth promotion.In addition,such symbiotic associations of PGPRs in the rhizospheric region also confer protection against several diseases caused by bacterial,fungal and viral pathogens.The biocontrol mechanism utilized by PGPR includes direct and indirect mechanisms direct PGPR mechanisms include the production of antibiotic,siderophore,and hydrolytic enzymes,competition for space and nutrients,and quorum sensing whereas,indirect mechanisms include rhizomicrobiome regulation via.secretion of root exudates,phytostimulation through the release of phytohormones viz.,auxin,cytokinin,gibberellic acid,1-aminocyclopropane-1-carboxylate and induction of systemic resistance through expression of antioxidant defense enzymes viz.,phenylalanine ammonia lyase(PAL),peroxidase(PO),polyphenyloxidases(PPO),superoxide dismutase(SOD),chitinase andβ-glucanases.For the suppression of plant diseases potent bio inoculants can be developed by modulating the rhizomicrobiome through rhizospheric engineering.In addition,understandings of different strategies to improve PGPR strains,their competence,colonization efficiency,persistence and its future implications should also be taken into consideration. 展开更多
关键词 plant growth-promoting rhizobacteria BIOCONTROL plant diseases PGPR mechanisms Sustainable agriculture
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Synergistic combination of arbuscular mycorrhizal fungi and plant growth-promoting rhizobacteria modulates morpho-physiological characteristics and soil structure in Nitraria tangutorum bobr.Under saline soil conditions 被引量:2
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作者 Jing Pan CuiHua Huang +5 位作者 Fei Peng Tao Wang Jie Liao ShaoXiu Ma QuanGang You Xian Xue 《Research in Cold and Arid Regions》 CSCD 2022年第6期393-402,共10页
Nitraria tangutorum Bobr.,a typical xero-halophyte,can be used for vegetation restoration and reconstruction in arid and semiarid regions affected by salinity.However,global climate change and unreasonable human activ... Nitraria tangutorum Bobr.,a typical xero-halophyte,can be used for vegetation restoration and reconstruction in arid and semiarid regions affected by salinity.However,global climate change and unreasonable human activity have exacerbated salinization in arid and semi-arid regions,which in turn has led to the growth inhibition of halophytes,including N.tangutorum.Arbuscular mycorrhizal fungi(AMF)and plant growth-promoting rhizobacteria(PGPR)have the potential to improve the salt tolerance of plants and their adaptation to saline soil environments.In this study,the effects of single and combined inoculations of AMF(Glomus mosseae)and PGPR(Bacillus amyloliquefaciens FZB42)on N.tangutorum were evaluated in severe saline soil conditions.The results indicate that AMF and PGPR alone may not adapt well to the real soil environment,and cannot ensure the effect of either growth promotion or salt-tolerance induction on N.tangutorum seedlings.However,the combination of AMF and PGPR significantly promoted mycorrhizal colonization,increased biomass accumulation,improved morphological development,enhanced photosynthetic performance,stomatal adjustment ability,and the exchange of water and gas.Co-inoculation also significantly counteracted the adverse effect of salinity on the soil structure of N.tangutorum seedlings.It is concluded that the effectiveness of microbial inoculation on the salt tolerance of N.tangutorum seedlings depends on the functional compatibility between plants and microorganisms as well as the specific combinations of AMF and PGPR. 展开更多
关键词 Nitraria tangutorum Bobr. Arbuscular mycorrhizal fungi plant growth-promoting rhizobacteria Morphological development Photosynthesis physiology Soil structure
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Assessing bacterial communities in the rhizosphere of 8-year-old genetically modified poplar(Populus spp.) 被引量:2
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作者 Wenxu Zhu Yanguang Chu +4 位作者 Changjun Ding Qinjun Huang Bingyu Zhang Weixi Zhang Xiaohua Su 《Journal of Forestry Research》 SCIE CAS CSCD 2016年第4期939-947,共9页
Microbe communities in rhizosphere ecosystems are important for plant health but there is limited knowledge of them in the rhizospheres of genetically modified(GM) plants, especial for tree species. We used the ampl... Microbe communities in rhizosphere ecosystems are important for plant health but there is limited knowledge of them in the rhizospheres of genetically modified(GM) plants, especial for tree species. We used the amplitude sequencing method to analyze the V4 regions of the 16 S r RNA gene to identify changes in bacterial diversity and community structure in two GM lines(D520 and D521), one non-genetically modified(nonGM) line and in uncultivated soil. After chimera filtering,468.133 sequences in the domain Bacteria remained. There were ten dominant taxonomic groups(with [1 % of all sequences) across the samples. 241 of 551 genera(representing a ratio of 97.33 %) were common to all samples.A Venn diagram showed that 1.926 operational taxonomic units(OTUs) were shared by all samples. We found a specific change, a reduction in Chloroflexi, in the microorganisms in the rhizosphere soil planted with poplars. Taken together, the results showed few statistical differences in the bacterial diversity and community structure between the GM line and non-GM line, this suggests that there was no or very limited impact of this genetic modification on the bacterial communities in the rhizosphere. 展开更多
关键词 rhizosphere communities Bacteria sequencing poplar planted taxonomic representing genera microbial
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How do nitrogen-limited alpine coniferous forests acquire nitrogen?A rhizosphere perspective 被引量:1
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作者 Huajun Yin Bartosz Adamczyk +5 位作者 Qitong Wang Biao Zhu Wanji Guo Xiaomin Zhu Qing Liu Ziliang Zhang 《Forest Ecosystems》 SCIE CSCD 2022年第6期745-754,共10页
Background:Alpine coniferous forest ecosystems dominated by ectomycorrhizal(ECM)tree species are generally characterized by low soil nitrogen(N)availability but stabilized plant productivity.Thus,elucidating potential... Background:Alpine coniferous forest ecosystems dominated by ectomycorrhizal(ECM)tree species are generally characterized by low soil nitrogen(N)availability but stabilized plant productivity.Thus,elucidating potential mechanisms by which plants maintain efficient N acquisition is crucial for formulating optimized management practices in these ecosystems.Methods:We summarize empirical studies conducted at a long-term field monitoring station in the alpine coniferous forests on the eastern Tibetan Plateau,China.We propose a root-soil interaction-based framework encompassing key components including soil N supply,microbial N transformation,and root N uptake in the rhizosphere.Results:We highlight that,(i)a considerable size of soil dissolved organic N pool mitigates plant dependence on inorganic N supply;(ii)ectomycorrhizal roots regulate soil N transformations through both rhizosphere and hyphosphere effects,providing a driving force for scavenging soil N;(iii)a complementary pattern of plant uptake of different soil N forms via root-and mycorrhizal mycelium-pathways enables efficient N acquisitions in response to changing soil N availability.Conclusions:Multiple rhizosphere processes abovementioned collaboratively contribute to efficient plant N acquisition in alpine coniferous forests.Finally,we identify several research outlooks and directions to improve the understanding and prediction of ecosystem functions in alpine coniferous forests under on-going global changes. 展开更多
关键词 plant nitrogen acquisition Root-soil interaction Alpine coniferous forests Nitrogen limitation rhizosphere
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Effect of Plant Growth-Promoting Rhizobacteria at Various Nitrogen Rates on Corn Growth 被引量:1
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作者 Yaru Lin Dexter B. Watts +2 位作者 Joseph W. Kloepper Anthony O. Adesemoye Yucheng Feng 《Agricultural Sciences》 2019年第12期1542-1565,共24页
Plant growth-promoting rhizobacteria (PGPR) colonize plant roots and promote plant growth by producing and secreting various chemical regulators in the rhizosphere. With the recent interest in sustainable agriculture,... Plant growth-promoting rhizobacteria (PGPR) colonize plant roots and promote plant growth by producing and secreting various chemical regulators in the rhizosphere. With the recent interest in sustainable agriculture, an increasing number of researchers are investigating ways to improve the efficiency of PGPR use to reduce chemical fertilizer inputs needed for crop production. Accordingly, greenhouse studies were conducted to evaluate the impact of PGPR inoculants on biomass production and nitrogen (N) content of corn (Zea mays L.) under different N levels. Treatments included three PGPR inoculants (two mixtures of PGPR strains and one control without PGPR) and five N application levels (0%, 25%, 50%, 75%, and 100% of the recommended N rate of 135 kg N ha&#8722;1). Results showed that inoculation of PGPR significantly increased plant height, stem diameter, leaf area, and root morphology of corn compared to no PGPR application under the same N levels at the V6 growth stage, but few differences were observed at the V4 stage. PGPR with 50% of the full N rate produced corn biomass and N concentrations equivalent to or greater than that of the full N rate without inoculants at the VT stage. In conclusion, mixtures of PGPR can potentially reduce inorganic N fertilization without affecting corn plant growth parameters. Future research is needed under field conditions to determine if these PGPR inoculants can be integrated as a bio-fertilizer in crop production nutrient management strategies. 展开更多
关键词 plant growth-promotING RHIZOBACTERIA CORN GROWTH NITROGEN FERTILIZATION Root Morphology NITROGEN Use Efficiency
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Potential seed germination-enhancing plant growth-promoting rhizobacteria for restoration of Pinus chiapensis ecosystems
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作者 Cristina Domínguez-Castillo Julia María Alatorre-Cruz +5 位作者 Dolores Castañeda-Antonio Jose Antonio Munive Xianwu Guo Jesús Francisco López-Olguín Luis Ernesto Fuentes-Ramírez Ricardo Carreño-López 《Journal of Forestry Research》 SCIE CAS CSCD 2021年第5期2143-2153,共11页
Rhizosphere soil samples of three Pinus chiapensis sites were analyzed for their physicochemical properties,soil bacteria isolated and screened in vitro for growthpromoting abilities.Nine isolates that showed promise ... Rhizosphere soil samples of three Pinus chiapensis sites were analyzed for their physicochemical properties,soil bacteria isolated and screened in vitro for growthpromoting abilities.Nine isolates that showed promise were identified to five genera Dyella,Luteimonas,Euterobacter,Paraburkholderia and Bacillus based on the sequences of16 S rRNA gene.All the strains were isolated from nondisturbed stands.These bacteria significantly decreased germination time and increased sprout sizes.Indole acetic acid and gibberellin production and phosphate solubilisation were detected.Results indicate that these biochemicals could be essential for P.chiapensis distribution and suggest the possibility that PGPR inoculation on P.chiapensis seeds prior to planting could improve germination and possibly seedling development. 展开更多
关键词 Pinus chiapensis plant growth-promoting rhizobacteria Dyella Luteimonas ENTEROBACTER
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Application Progress of Plant Growth-promoting Bacteria in Crops
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作者 Ting ZHANG Ling ZHANG +3 位作者 Yingying ZHANG Ran ZHENG Fuxing XIANG Jie LI 《Agricultural Biotechnology》 CAS 2022年第6期18-21,38,共5页
Plant growth-promoting bacteria(PGPBs)can promote plant growth and improve crop yield.They can induce plant systemic resistance to resist biotic and abiotic stresses.In recent years,with the development of green ecolo... Plant growth-promoting bacteria(PGPBs)can promote plant growth and improve crop yield.They can induce plant systemic resistance to resist biotic and abiotic stresses.In recent years,with the development of green ecological agriculture,new biological fertilizers such as microbial inocula and microbial fertilizers based on PGPBs have been gradually applied in crop planting.Based on plant growth promotion and disease control,the application progress of PGPBs in crops from the aspects of growth promotion mechanism,growth promotion effect,resistance to biological and abiotic stresses were discussed,aiming to provide reference for the relevant research and application of PGPBs in crops. 展开更多
关键词 plant growth-promoting bacteria(PGPBs) CROPS Application progress
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间作黄芪对当归根际土壤微生物的影响 被引量:1
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作者 李媛媛 谢丰璞 +8 位作者 王楠 高静 黄文静 李铂 孙晓春 宋忠兴 唐志书 王二欢 马存德 《中国野生植物资源》 CSCD 2024年第1期79-86,92,共9页
目的:探讨根际土壤微生物对中药材种植模式的响应方式。方法:以间作黄芪及单作下当归根际土壤为研究对象,基于高通量测序技术,分析土壤微生物在不同季节及种植模式下群落组成及功能的差异。结果:间作下Chao1指数、ACE指数高于单作,变形... 目的:探讨根际土壤微生物对中药材种植模式的响应方式。方法:以间作黄芪及单作下当归根际土壤为研究对象,基于高通量测序技术,分析土壤微生物在不同季节及种植模式下群落组成及功能的差异。结果:间作下Chao1指数、ACE指数高于单作,变形菌门、放线菌门、酸杆菌门、绿弯菌门和芽单胞菌门为间作下的优势菌门,芽单胞菌门的相对丰度在间作下高于单作。11月间作下γ变形菌纲、7月间作下全噬菌纲的丰度显著高于单作。KEGG功能预测表明,在不同时间及间作下根际土壤细菌与细胞过程、环境信息处理、遗传信息处理、代谢功能下属的23类二级功能基因的相对丰度存在显著差异;参与氮循环的功能基因K00371(narH/narY/nxrB)、(K00374 narI/narV)等OTU数在间作下显著高于单作;不同门、纲在间作下的共生网络比单作下连接紧密且更复杂。结论:当归间作黄芪影响土壤细菌群落组成,增加其丰富度及功能的丰富性,影响土壤氮循环能力,促进土壤微生物间的交互作用。 展开更多
关键词 土壤微生物 根际 高通量测序 多样性 种植方式
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生物刺激素对烤烟根际微生态及烟叶品质的影响
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作者 王政 欧清华 +5 位作者 冯烨君 吴彪 赵岂彬 邓泳 李博 敖金成 《西北农林科技大学学报(自然科学版)》 CSCD 北大核心 2024年第10期59-68,共10页
【目的】探究生物刺激素在烤烟栽培上的应用效果,为植烟土壤改良及烟叶品质改善提供新的思路。【方法】采用大田试验,以常规施肥为对照(CK),在CK基础上设施用海藻酸(BS1)、古生物源生物刺激素(BS2)和矿源黄腐酸(BS3)3个生物刺激素处理,... 【目的】探究生物刺激素在烤烟栽培上的应用效果,为植烟土壤改良及烟叶品质改善提供新的思路。【方法】采用大田试验,以常规施肥为对照(CK),在CK基础上设施用海藻酸(BS1)、古生物源生物刺激素(BS2)和矿源黄腐酸(BS3)3个生物刺激素处理,于烤烟盛花期取烟株根围土壤测定土壤理化性质(pH、阳离子交换量及有机质、碱解氮、速效磷、速效钾含量)、酶(蔗糖酶、硝酸还原酶、过氧化氢酶、脲酶)活性及微生物群落多样性;于烤烟成熟时调查农艺性状(株高、茎围、有效叶片数、最大腰叶长、最大腰叶宽、顶叶长、顶叶宽、叶面积),并对上部叶(倒数第5~6片烟叶)进行标识,调制后进行化学成分(总糖、还原糖、烟碱、总氮、钾、氯、淀粉含量,糖碱比、氮碱比、钾氯比)测算,分析3种生物刺激素对植烟土壤微生态环境及烟叶品质的影响。【结果】与CK相比,BS1和BS3处理不同程度提高了植烟土壤氮、磷、钾速效养分含量及阳离子交换量,极显著提高了土壤蔗糖酶和脲酶活性;明显提高土壤优势菌门奇古菌门(Thaumarchaeota)和根肿黑粉菌门(Entorrhizomycota)的相对丰度,以及优势菌属根肿黑粉菌属(Entorrhiza)的相对丰度,而降低子囊菌门(Ascomycota)和镰刀菌属(Fusarium)的相对丰度;BS3处理土壤细菌、真菌群落的丰富度和多样性及其功能代谢途径丰度均高于CK、BS1和BS2处理;施用生物刺激素可促进烤烟生长发育和烟叶开片,其中BS3处理有利于提高烟叶化学成分适宜性和协调性。【结论】矿源黄腐酸处理改良土壤、促进烤烟生长及提升烟叶品质的综合效应较优,是适合烤烟施用的生物刺激素。 展开更多
关键词 生物刺激素 植烟土壤 根际微生态 烟草栽培 烟叶品质
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