Rhizosphere bacteria induced by aluminum-tolerant and aluminum-sensitive soybeans in acid soil
2012
Yang, T., Nanjing Univ. (China). State Key Lab. of Pharmaceutical Biotechnology | Ding, Y., Nanjing Univ. (China). State Key Lab. of Pharmaceutical Biotechnology | Zhu, Y., Nanjing Univ. (China). State Key Lab. of Pharmaceutical Biotechnology | Li, Y., Nanjing Univ. (China). State Key Lab. of Pharmaceutical Biotechnology | Wang, X., Nanjing Univ. (China). State Key Lab. of Pharmaceutical Biotechnology | Yang, R., Nanjing Univ. (China). State Key Lab. of Pharmaceutical Biotechnology | Lu, G., Nanjing Univ. (China). State Key Lab. of Pharmaceutical Biotechnology | Qi, J., Nanjing Univ. (China). State Key Lab. of Pharmaceutical Biotechnology | Yang, Y., Nanjing Univ. (China). State Key Lab. of Pharmaceutical Biotechnology
The aim of this study was to assess the effect of two different soybean genotypes, BX10 (Al-tolerant) and BD2 (Al-sensitive), on rhizosphere microbial communities and organic acids. Organic acid analysis in the rhizosphere soil indicated that BX10 increased the concentration of citric acid, whereas BD2 decreased it; malic acid was only found in the rhizosphere soil of BX10. Redundancy analysis results also showed that the two soybean genotypes induced distinct rhizosphere microbial communities. Citric and malic acids had a significantly positive correlation with rhizosphere bacteria of BX10. The community level physiological profiling showed that BX10 might have more influence than BD2 on the ability to metabolize organic C substrates. Sequence analysis indicated that both soybeans stimulated some rhizobacteria, such as Acinetobacter, Candidatus Amoebinatus, and uncultured Proteobacterium. This study revealed that rhizobacteria of two soybeans may be related to their organic acid exudation.
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