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Updated: Jun 16, 2025

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Root microbiota regulates tiller number in rice.

Jingying Zhang1, Bing Wang2, Haoran Xu3

  • 1Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China; Peking-Tsinghua Center for Life Sciences, State Key Laboratory of Gene Function and Modulation Research, Peking-Tsinghua-NIBS Graduate Program, School of Life Sciences, Peking University, Beijing 100871, China; CAS-JIC Centre of Excellence for Plant and Microbial Science, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China.

Cell
|April 23, 2025
PubMed
Summary

The root microbiota significantly influences rice tillering. A bacterial compound, cyclo(Leu-Pro), activates the strigolactone (SL) pathway, regulating tiller number for sustainable agriculture.

Keywords:
cyclo(Leu-Pro)dipeptidefield trialmicrobial cultivationriceroot microbiomeroot microbiotastrigolactone pathwaytiller number

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Area of Science:

  • Plant Science
  • Microbiology
  • Agronomy

Background:

  • Rice tillering is a crucial agronomic trait influenced by genetics and environment.
  • The impact of root microbiota on rice tillering remains largely unexplored.

Purpose of the Study:

  • To investigate the correlation between root microbiota composition and rice tiller number.
  • To elucidate the mechanisms by which root bacteria modulate rice tillering.

Main Methods:

  • Analysis of root microbiota composition and tiller numbers in 182 rice varieties.
  • Cultivation of bacterial isolates to test their effect on tillering in lab and field.
  • Genetic, biochemical, and structural analyses to identify the molecular mechanism.

Main Results:

  • A significant correlation was found between root microbiota composition and rice tiller number.
  • Bacterial isolates demonstrated the ability to regulate rice tillering.
  • Cyclo(Leu-Pro) from Exiguobacterium R2567 activates the strigolactone (SL) signaling pathway by binding to OsD14, inhibiting tillering.

Conclusions:

  • Root microbiota plays a significant role in regulating rice tillering.
  • The cyclo(Leu-Pro) molecule mediates this regulation via the SL pathway.
  • Harnessing root microbiota offers a sustainable strategy for optimizing crop growth.