期刊
PLANT JOURNAL
卷 80, 期 5, 页码 758-771出版社
WILEY
DOI: 10.1111/tpj.12666
关键词
plant-microbe interaction; volatile organic compounds; auxin signalling; root development; Arabidopsis thaliana; Escherichia coli; plant-growth-promoting rhizobacteria
资金
- Plant Science Centre-Syngenta Fellowship
- Swiss National Science Foundation [31003A-149271]
- Swiss National Science Foundation (SNF) [31003A_149271] Funding Source: Swiss National Science Foundation (SNF)
Recently, emission of volatile organic compounds (VOCs) has emerged as a mode of communication between bacteria and plants. Although some bacterial VOCs that promote plant growth have been identified, their underlying mechanism of action is unknown. Here we demonstrate that indole, which was identified using a screen for Arabidopsis growth promotion by VOCs from soil-borne bacteria, is a potent plant-growth modulator. Its prominent role in increasing the plant secondary root network is mediated by interfering with the auxin-signalling machinery. Using auxin reporter lines and classic auxin physiological and transport assays we show that the indole signal invades the plant body, reaches zones of auxin activity and acts in a polar auxin transport-dependent bimodal mechanism to trigger differential cellular auxin responses. Our results suggest that indole, beyond its importance as a bacterial signal molecule, can serve as a remote messenger to manipulate plant growth and development.
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