Rhizosphere microorganisms can influence the timing of plant flowering

Tao Lu, Mingjing Ke, Michel Lavoie, Yujian Jin, Xiaoji Fan, Zhenyan Zhang, Zhengwei Fu, Liwei Sun, Michael Gillings, Josep Peñuelas, Haifeng Qian*, Yong Guan Zhu

*Corresponding author for this work

Research output: Contribution to journalArticle

43 Citations (Scopus)
16 Downloads (Pure)

Abstract

Background: Plant phenology has crucial biological, physical, and chemical effects on the biosphere. Phenological drivers have largely been studied, but the role of plant microbiota, particularly rhizosphere microbiota, has not been considered. Results: We discovered that rhizosphere microbial communities could modulate the timing of flowering of Arabidopsis thaliana. Rhizosphere microorganisms that increased and prolonged N bioavailability by nitrification delayed flowering by converting tryptophan to the phytohormone indole acetic acid (IAA), thus downregulating genes that trigger flowering, and stimulating further plant growth. The addition of IAA to hydroponic cultures confirmed this metabolic network. Conclusions: We document a novel metabolic network in which soil microbiota influenced plant flowering time, thus shedding light on the key role of soil microbiota on plant functioning. This opens up multiple opportunities for application, from helping to mitigate some of the effects of climate change and environmental stress on plants (e.g. abnormal temperature variation, drought, salinity) to manipulating plant characteristics using microbial inocula to increase crop potential.

Original languageEnglish
Article number231
Pages (from-to)1-12
Number of pages12
JournalMicrobiome
Volume6
Issue number1
DOIs
Publication statusPublished - 26 Dec 2018

Bibliographical note

Copyright the Author(s) 2018. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

Keywords

  • rhizosphere
  • microbiota
  • root exudate
  • nitrogen
  • indole acetic acid
  • Arabidopsis
  • flowering time

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