Rhizosphere microbial communities and organic acids secreted by aluminum-tolerant and aluminum-sensitive soybean in acid soil |
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Authors: | Tongyi Yang Genlin Liu Yongchun Li Simei Zhu Ailan Zou Jinliang Qi Yonghua Yang |
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Institution: | (1) State Key Laboratory of Pollution Control and Resource Reuse, NJU-NFU Institute of Plant Molecular Biology, State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing, 210093, People’s Republic of China; |
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Abstract: | This study aimed to investigate the correlation between organic acids secreted by two soybeans genotypes, BX10 aluminum (Al)
tolerant] and BD2 (Al sensitive) and rhizosphere microbial communities in acid soil. The organic acids secreted by BX10 and
BD2 were significantly different at each growth stage. Both fungi/bacteria and gram-negative bacteria/gram-positive bacteria
ratio values were affected by the two soybean genotypes at different growth periods. Compared with BD2, phospholipid fatty
acid of BX10 showed higher Shannon diversity at the seedling and flowering stages, but had lower Shannon diversity at the
pod-setting stage. Redundancy analysis and canonical correspondence analysis revealed that the organic acids including tartaric
acid, lactic acid, and citric acid significantly affected rhizosphere bacterial communities. Sequence analysis indicated that
uncultured Acidobacterium, Chloroflexi, and actinomycete enriched in BD2, whereas some uncultured bacteria enriched in BX10. The two soybean genotypes
exhibit distinct rhizosphere microbial communities; root organic acid exudates may affect composition of microbial communities
of rhizosphere soil: tartaric acid may negatively affect rhizosphere bacteria at the seedling stage, lactic acid may positively
affect rhizosphere actinomycetes at the flowering stage, and succinic acid may stimulate fungi at the pod-setting stage. |
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