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Plant Cell Environ

Title:		Volatile compounds from beneficial rhizobacteria Bacillus spp. promote periodic lateral root development in Arabidopsis
Author(s):		Li Y; Shao J; Xie Y; Jia L; Fu Y; Xu Z; Zhang N; Feng H; Xun W; Liu Y; Shen Q; Xuan W; Zhang R;
Address:		"Jiangsu Provincial Key Lab for Organic Solid Waste Utilization, National Engineering Research Center for Organic-based Fertilizers, Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing Agricultural University, Nanjing, China. State Key Laboratory of Crop Genetics and Germplasm Enhancement and MOA Key Laboratory of Plant Nutrition and Fertilization in Lower-Middle Reaches of the Yangtze River, Nanjing Agricultural University, Nanjing, China. Key Laboratory of Microbial Resources Collection and Preservation, Ministry of Agriculture, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China"
Journal Title:		Plant Cell Environ
Year:		2021
Volume:		20210218
Issue:		5
Page Number:		1663 - 1678
DOI:		10.1111/pce.14021
ISSN/ISBN:		1365-3040 (Electronic) 0140-7791 (Linking)
Abstract:		"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"
Keywords:		"Acetoin/pharmacology Arabidopsis/drug effects/genetics/*microbiology Bacillus amyloliquefaciens/drug effects/*physiology Gene Expression Regulation, Plant/drug effects Indoleacetic Acids/metabolism Models, Biological Plant Roots/drug effects/growth & deve;"
Notes:		"MedlineLi, Yucong Shao, Jiahui Xie, Yuanming Jia, Letian Fu, Yansong Xu, Zhihui Zhang, Nan Feng, Haichao Xun, Weibing Liu, Yunpeng Shen, Qirong Xuan, Wei Zhang, Ruifu eng Research Support, Non-U.S. Gov't 2021/02/07 Plant Cell Environ. 2021 May; 44(5):1663-1678. doi: 10.1111/pce.14021. Epub 2021 Feb 18"