Volatile compounds from beneficial rhizobacteria Bacillus spp. promote periodic lateral root development in Arabidopsis

文献类型： 外文期刊

第一作者： Li, Yucong

作者： Li, Yucong;Shao, Jiahui;Fu, Yansong;Xu, Zhihui;Zhang, Nan;Feng, Haichao;Xun, Weibing;Shen, Qirong;Zhang, Ruifu;Xie, Yuanming;Jia, Letian;Xuan, Wei;Xie, Yuanming;Jia, Letian;Xuan, Wei;Liu, Yunpeng;Zhang, Ruifu

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关键词： auxin; Bacillus; lateral root; oscillation; PGPR; prebranch site; volatile compounds

期刊名称：PLANT CELL AND ENVIRONMENT （ 影响因子：7.228； 五年影响因子：7.791 ）

ISSN： 0140-7791

年卷期： 2021 年 44 卷 5 期

页码：

收录情况： SCI

摘要： Lateral root formation is coordinated by both endogenous and external factors. As biotic factors, plant growth-promoting rhizobacteria can affect lateral root formation, while the regulation mechanism is unclear. In this study, by applying various marker lines, we found that volatile compounds (VCs) from Bacillus amyloliquefaciens SQR9 induced higher frequency of DR5 oscillation and prebranch site formation, accelerated the development and emergence of the lateral root primordia and thus promoted lateral root development in Arabidopsis. We demonstrated a critical role of auxin on B. amyloliquefaciens VCs-induced lateral root formation via respective mutants and pharmacological experiments. Our results showed that auxin biosynthesis, polar transport and signalling pathway are involved in B. amyloliquefaciens VCs-induced lateral roots formation. We further showed that acetoin, a major component of B. amyloliquefaciens VCs, is less active in promoting root development compared to VC blends from B. amyloliquefaciens, indicating the presence of yet uncharacterized/unknown VCs might contribute to B. amyloliquefaciens effect on lateral root formation. In summary, our study revealed an auxin-dependent mechanism of B. amyloliquefaciens VCs in regulating lateral root branching in a non-contact manner, and further efforts will explore useful VCs to promote plant root development.

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