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Gravity sensing in plants.

Xiaolian Wang1,2,3, Xinyue Cai1,2, Huan Huo1,2

  • 1Center for Plant Biology, State Key Laboratory of Green Biomanufacturing, School of Life Sciences, Tsinghua University, Beijing, 100084, China.

The New Phytologist
|June 4, 2026
PubMed
Summary
This summary is machine-generated.

Plant gravitropism, essential for growth, is now understood at a molecular level. New findings reveal how amyloplasts and LAZY proteins mediate gravity sensing, with potential agricultural impacts.

Keywords:
LAZYTOCamyloplastcolumella cellendodermal cellgravitropismgravity sensingstatocyte

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Area of Science:

  • Plant biology
  • Gravitropism research
  • Plant physiology

Background:

  • Plants exhibit gravitropism, with shoots growing up and roots down, guided by gravity.
  • Specialized cells called statocytes in shoots and roots sense gravity.
  • The starch-statolith hypothesis has long explained gravity sensing, but lacked molecular detail.

Purpose of the Study:

  • To review current knowledge on plant gravity sensing mechanisms.
  • To integrate insights from vascular and nonvascular plants for evolutionary context.
  • To discuss potential agricultural applications of gravity-sensing research.

Main Methods:

  • Review of existing literature on plant gravitropism.
  • Analysis of molecular mechanisms of gravity perception.
  • Comparative study across plant lineages.

Main Results:

  • A 2023 discovery established the molecular basis of gravity sensing: sedimenting amyloplasts repolarize LAZY proteins.
  • This defines gravity sensing as amyloplast sedimentation to LAZY protein repolarization.
  • Alternative gravity-sensing pathways independent of starch-statoliths may exist.

Conclusions:

  • The molecular mechanism of gravity sensing via amyloplasts and LAZY proteins is now clearer.
  • Further research is needed to understand alternative gravity-sensing pathways.
  • Understanding gravitropism can lead to significant agricultural advancements.