scholarly journals Effect of Epichloë gansuensis endophyte on rhizosphere bacterial communities and nutrient concentrations and ratios in the perennial grass species Achnatherum inebrians during three growth seasons

2020 ◽  
Vol 71 (12) ◽  
pp. 1050
Author(s):  
Wenpeng Hou ◽  
Chao Xia ◽  
Michael J. Christensen ◽  
Jianfeng Wang ◽  
Xiuzhang Li ◽  
...  
Keyword(s):  
Bacterial Community ◽  
Soil Fertility ◽  
Host Plants ◽  
Perennial Grass ◽  
Rhizosphere Bacteria ◽  
Achnatherum Inebrians ◽  
Grass Endophyte ◽  
Different Seasons ◽  
Rhizosphere Bacterial Community ◽  
Grass Growth

Achnatherum inebrians is an invasive perennial grass widespread in natural grasslands of north-west China and plays an important role in grassland ecological restoration. The presence of the seed-borne endophytic fungus Epichloë gansuensis in A. inebrians promotes grass growth, increases resistance to abiotic stress, and affects the rhizosphere microbial community of host plants. However, the relationships among E. gansuensis, rhizosphere bacteria and plant contents of carbon (C), nitrogen (N), phosphorus (P) and potassium (K) during different growing seasons are not clear. We examined changes in the rhizosphere bacterial community and in nutrient contents and ratios in A. inebrians with (E+) and without (E−) E. gansuensis in May, August and December. The Shannon diversity index was higher for rhizosphere bacteria of E+ than E− plants in the three different seasons. Leaf C, N and P contents and root P and K contents were higher in E+ than E− plants in May, and leaf K and root C were higher in E+ than E− plants in August. Leaf C:N ratios were lower in E+ than E− plants in December, and leaf C:K ratios were lower in E+ than E− plants in August and December. In addition, our results indicate significant interactions among rhizosphere bacteria, C, N, P and K contents, and endophyte treatment in three different seasons. In conclusion, E. gansuensis enhanced the C, N, P and K contents of host plants, and affected nutrient ratios of A. inebrians probably by increasing rhizosphere bacterial diversity and altering rhizosphere bacterial community structure. This study provides new findings on the ecological function of the endophyte E. gansuensis, including its potential role in enhancing soil fertility. The improvements in soil fertility were utilised in extrapolating to forage grass–endophyte associations.

scholarly journals Response of Sugarcane Rhizosphere Bacterial Community to Drought Stress

2021 ◽  
Vol 12 ◽  
Author(s):  
Qi Liu ◽  
Xiaowen Zhao ◽  
Yue Liu ◽  
Sasa Xie ◽  
Yuanjun Xing ◽  
...  
Keyword(s):  
Community Structure ◽  
Drought Stress ◽  
Bacterial Community ◽  
Bacterial Community Structure ◽  
Host Plants ◽  
Community Response ◽  
Rhizosphere Bacteria ◽  
Rhizosphere Microorganisms ◽  
Rdna Sequencing ◽  
Rhizosphere Bacterial Community

Sugarcane is an important sugar and energy crop, and its yield is greatly affected by drought. Although a large number of studies have shown that rhizosphere microorganisms can help improve the adaptability of plants to biotic or abiotic stresses, there is a lack of studies on the adaptability of sugarcane rhizosphere microbial communities to host plants. Therefore, we conducted drought stress treatment and normal irrigation treatment on three sugarcane varieties GT21, GT31, and GT42 widely cultivated in Guangxi. Using 16S rDNA sequencing technology to analyze the changes in abundance of the sugarcane rhizosphere bacterial community under different treatments, combined with the determination of soil enzyme activity, soil nutrient content, and sugarcane physiological characteristics, we explored the sugarcane rhizosphere bacterial community response to drought stress. In addition, we used the structural equation model to verify the response path of sugarcane rhizosphere bacteria. The results show that the bacterial community structure in the rhizosphere of sugarcane is stable under normal water conditions. The change in the bacterial community structure under drought stress has a 25.2% correlation with the drought adaptability of sugarcane, but the correlation with drought stress is as high as 42.17%. The changes in abundance of rhizosphere bacteria under drought stress are mainly concentrated in the phylum Rhizobiales and Streptomycetales. This change is directly related to the physiological state of the host plant under drought stress, soil available phosphorus, soil urease and soil acid protease. We investigated the response species of rhizosphere microorganisms and their response pathways under drought stress, providing a scientific basis for rhizosphere microorganisms to assist host plants to improve drought adaptability.

scholarly journals Changes in diversity and composition of rhizosphere bacterial community during natural restoration stages in antimony mine

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e12302
Author(s):  
Renyan Duan ◽  
Yuxiang Lin ◽  
Jianing Zhang ◽  
Minyi Huang ◽  
Yihuan Du ◽  
...  
Keyword(s):  
Bacterial Community ◽  
Bacterial Diversity ◽  
Ecological Restoration ◽  
Relative Abundance ◽  
High Throughput Sequencing ◽  
Rhizosphere Bacteria ◽  
Open Pit ◽  
Natural Restoration ◽  
Rhizosphere Bacterial Community ◽  
Early Restoration

Background Open pit antimony (Sb) mining causes serious soil pollution, and phytoremediation is a low-cost approach to remediate heavy metal contaminated soil. Rhizosphere bacteria play an important role in ecological restoration in mining areas. There is a knowledge gap on how to find suitable rhizosphere microorganisms to improve the phytoremediation effect. Understanding the differences of rhizosphere bacterial diversity in different restoration stages is helpful to find suitable bacteria for ecological restoration. Methods A method of the substitution of “space” for “time” was used to study the effect of natural restoration on rhizosphere bacterial community. According to the dominant vegetation types (herb, shrub, and tree) in the natural restoration area of Sb mining, the early restoration (ER), middle restoration (MR), and later restoration (LR) from the largest Sb mine (Xikuangshan mine) in the world were selected to evaluate the differences in the composition and diversity of rhizosphere bacteria during three natural restoration stages. Each restoration stage had five samples. To determine the relationship between restoration stages and bacterial diversity in the rhizosphere, high throughput sequencing of PCR amplified were used. Results Alpha diversity, as assessed by Chao indices, appeared lowest in ER but this trend was not seen with other diversity metrics, including the Simpson and Shannon. Beta diversity analysis suggested there were differences in rhizobacterial community structure associate with restoration stage. At the phylum level, natural restoration led to a significant increase in the relative abundance of Actinobacteria in the MR, and a significant decrease in the relative abundance of Patescibacteria in the LR. Additionally, Calditrichaeota, Deferribacteres and Epsilonbacteraeota were only found in ER. At the genus level, the relative abundance of RB41 and Haliangium were highest in LR plots, while that of Bacillus and Gaiella were highest in ER plots. Additionally, the Azorhizobium genus was only detected in the ER phase. Overall, our findings suggested that several rhizosphere microbial communities had significant differences among three natural restoration stages (ER, MR, and LR) and the rhizosphere bacterial communities mainly appeared in the early restoration stage can be preferred for remediation of pollution soil in Xikuangshan.

Composition and co-occurrence patterns of Phragmites australis rhizosphere bacterial community

2021 ◽  
Author(s):  
Siwen Hu ◽  
Rujia He ◽  
Wanjie Wang ◽  
Dayong Zhao ◽  
Jin Zeng ◽  
...  
Keyword(s):  
Bacterial Community ◽  
Phragmites Australis ◽  
Rhizosphere Bacterial Community ◽  
Occurrence Patterns

scholarly journals Bacillus amyloliquefaciens FH-1 significantly affects cucumber seedlings and the rhizosphere bacterial community but not soil

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jingjing Wang ◽  
Song Xu ◽  
Rong Yang ◽  
Wei Zhao ◽  
Dan Zhu ◽  
...  
Keyword(s):  
Bacterial Community ◽  
Soil Properties ◽  
Bacillus Amyloliquefaciens ◽  
Soil Conditions ◽  
Plant Growth Promoting Bacteria ◽  
Linear Discriminant ◽  
Cucumber Seedlings ◽  
Ecological Roles ◽  
Plant Growth Promoting ◽  
Rhizosphere Bacterial Community

AbstractPlant growth-promoting bacteria (PGPB) inoculants have been applied worldwide. However, the ecological roles of PGPB under different soil conditions are still not well understood. The present study aimed to explore the ecological roles of Bacillus amyloliquefaciens FH-1 (FH) on cucumber seedlings, rhizosphere soil properties, and the bacterial community in pot experiments. The results showed that FH had significant effects on cucumber seedlings and the rhizosphere bacterial community but not on soil properties. The FH promoted cucumber seedlings growth, reduced the rhizosphere bacterial diversity, increased Proteobacteria, and decreased Acidobacteria. Linear discriminant analysis (LDA) effect size (LEfSe) revealed that FH enriched two taxa (GKS2_174 and Nannocystaceae) and inhibited 18 taxa (mainly Acidobacteria, Actinobacteria, BRC1, Chloroflexi, Plantctomycetes, and Verrucomicrobia). Co-occurrence network analysis demonstrated that FH increased bacteria-bacteria interactions and that Bacillus (genus of FH) had few interactions with the enriched and inhibited taxa. This might indicate that FH does not directly affect the enriched and inhibited taxa. Correlation analysis results displayed that cucumber seedlings’ weight and height/length (except root length) were significantly correlated with the 18 inhibited taxa and the enriched taxa Nannocystaceae. It was speculated that FH might promote cucumber seedling growth by indirectly enriching Nannocystaceae and inhibiting some taxa from Acidobacteria, Actinobacteria, BRC1, Chloroflexi, Plantctomycetes, and Verrucomicrobia.

Interaction of plant genotype and management in the persistence of a perennial grass exposed to grazing and soil fertility stresses

2015 ◽  
Vol 71 (4) ◽  
pp. 540-558 ◽  
Author(s):  
R. A. Culvenor ◽  
R. J. Simpson
Keyword(s):  
Soil Fertility ◽  
Perennial Grass ◽  
Plant Genotype

Shift of millet rhizosphere bacterial community during the maturation of parent soil revealed by 16S rDNA high-throughput sequencing

2019 ◽  
Vol 135 ◽  
pp. 157-165 ◽  
Author(s):  
Lixia Xu ◽  
Yansha Han ◽  
Min Yi ◽  
Huilan Yi ◽  
Erhu Guo ◽  
...  
Keyword(s):  
Bacterial Community ◽  
16S Rdna ◽  
High Throughput ◽  
High Throughput Sequencing ◽  
Rhizosphere Bacterial Community

scholarly journals A change in the bacterial community of spider mites decreases fecundity on multiple host plants

2018 ◽  
Vol 8 (6) ◽  
Author(s):  
Yu‐Xi Zhu ◽  
Yue‐Ling Song ◽  
Ary A. Hoffmann ◽  
Peng‐Yu Jin ◽  
Shi‐Mei Huo ◽  
...  
Keyword(s):  
Bacterial Community ◽  
Host Plants ◽  
Spider Mites

Comprehensive effects of salt stress and peanut cultivars on the rhizosphere bacterial community diversity of peanut

2021 ◽  
Vol 204 (1) ◽  
Author(s):  
Yang Xu ◽  
Zhimeng Zhang ◽  
Hong Ding ◽  
Saiqun Wen ◽  
Guanchu Zhang ◽  
...  
Keyword(s):  
Salt Stress ◽  
Bacterial Community ◽  
Community Diversity ◽  
Bacterial Community Diversity ◽  
Rhizosphere Bacterial Community ◽  
Peanut Cultivars
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