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Auxin-mediated statolith production for root gravitropism.

Yuzhou Zhang1,2, Peng He1, Xiongfeng Ma3,4

  • 1Key Laboratory of the Ministry of Education for Medicinal Plant Resources and Natural Pharmaceutical Chemistry, National Engineering Laboratory for Resource Development of Endangered Crude Drugs in the Northwest of China, College of Life Sciences, Shaanxi Normal University, No. 620, West Chang'an Avenue, Chang'an District, Xi'an, 710119, China.

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Summary

Auxin regulates starch granule formation and accumulation in plant roots, which are essential for sensing gravity. This study reveals auxin

Keywords:
Arabidopsisauxingravity perception and responseroot gravitropismstatolith

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Area of Science:

  • Plant Biology
  • Plant Physiology
  • Molecular Biology

Background:

  • Root gravitropism is crucial for plant adaptation to terrestrial environments.
  • Auxin's role in root gravitropism is central but its precise mechanisms in gravity perception and response remain incompletely understood.
  • PIN-directed auxin transport establishes local auxin gradients essential for developmental processes.

Purpose of the Study:

  • To elucidate the role of auxin in mediating gravity perception and response in plant roots.
  • To investigate the molecular mechanisms by which auxin influences statolith formation and gravitropism.

Main Methods:

  • Analysis of auxin gradients generated by PIN transporters in the root apex.
  • Investigation of auxin's effect on starch granule synthesis genes (SS4, PGM, ADG1).
  • Utilized the cvxIAA-ccvTIR1 system to assess TIR1-mediated auxin signaling.
  • Examined gravitropic responses and starch granule accumulation in axr3 mutants.

Main Results:

  • Local auxin maxima/gradients regulate the expression of starch granule synthesis genes (SS4, PGM, ADG1), influencing statolith accumulation.
  • TIR1-mediated auxin signaling is essential for starch granule formation and root gravitropism.
  • axr3 mutants exhibit impaired auxin-mediated starch granule accumulation and disrupted gravitropism.

Conclusions:

  • Auxin plays a dual role in gravitropism, regulating both gravity perception (via statolith production) and response.
  • Auxin-mediated statolith production depends on the TIR1/AFB-AXR3 signaling pathway.
  • This study provides a detailed molecular framework for auxin's function in root gravitropism.