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Physiol Plant

Title:		Protecting tobacco plants from O(3) injury by Bacillus velezensis with production of acetoin
Author(s):		Liu L; Zhao X; Huang Y; Ke L; Wang R; Qi G;
Address:		"College of Life Science and Technology, Huazhong Agricultural University, Wuhan, China. Technology Center, Enshi State Tobacco Cooperation, Hubei Province Tobacco CO., Ltd., Enshi, China"
Journal Title:		Physiol Plant
Year:		2020
Volume:		20200628
Issue:		2
Page Number:		158 - 171
DOI:		10.1111/ppl.13120
ISSN/ISBN:		1399-3054 (Electronic) 0031-9317 (Linking)
Abstract:		"Plant growth-promoting rhizobacteria (PGPRs) confer benefits to crops by producing volatile organic compounds (VOCs) to trigger induced systemic tolerance (IST). Here we show that Bacillus velezensis GJ11, a kind of PGPRs, produce VOCs such as 2,3-butanediol and acetoin to trigger IST and cause stomatal closure against O(3) injury in tobacco plants. Compared to 2,3-butanediol, acetoin was more effective on triggering IST against O(3) injury. The bdh-knockout strain GJ11Deltabdh with a blocked metabolic pathway from acetoin to 2,3-butanediol produced more acetoin triggering stronger IST against O(3) injury than GJ11. Both acetoin and GJ11Deltabdh effectively enhance the antioxidant enzymes activity (e.g. superoxide dismutase and catalases) that is favorable for scavenging the reactive oxygen species like H(2) O(2) in leaves after exposure to O(3) . Consequently, less H(2) O(2) accumulation was observed, and reasonably less chlorophylls and proteins were damaged by H(2) O(2) in the tobacco leaves treated with acetoin or GJ11Deltabdh. The field experiment also showed that both acetoin and GJ11Deltabdh could protect tobacco plants from O(3) injury after application by root-drench. This study provides new insights into the role of rhizobacterial B. velezensis and its volatile component of acetoin in triggering defense responses against stresses such as O(3) in plants"
Keywords:		*Acetoin *Bacillus Butylene Glycols Tobacco;
Notes:		"MedlineLiu, Lidong Zhao, Xiuyun Huang, Yong Ke, Luxin Wang, Rui Qi, Gaofu eng 31870030/National Natural Science Foundation of China/ Denmark 2020/05/10 Physiol Plant. 2020 Oct; 170(2):158-171. doi: 10.1111/ppl.13120. Epub 2020 Jun 28"