Light-Dark Modulates Root Hydrotropism Associated with Gravitropism by Involving Amyloplast Response in Arabidopsis

Ying Li, Wei Yuan, Luocheng Li, Rui Miao, Hui Dai, Jianhua ZHANG, Weifeng Xu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The role of amyloplasts in the interactions between hydrotropism and gravitropism has been previously described. However, the effect of light-dark on the interactions between the two tropisms remains unclear. Here, by developing a method that makes it possible to mimic natural conditions more closely than the conventional lab conditions, we show that hydrotropism is higher in wild-type Arabidopsis seedlings whose shoots are illuminated but whose roots are grown in the dark compared with seedlings that are fully exposed to light. Root gravitropism is substantially decreased because of the reduction of amyloplast content in the root tip with decreased gene expression in PGM1 (a key starch biosynthesis gene), which may contribute to enhanced root hydrotropism under darkness. Furthermore, the starch-deficient mutant pgm1-1 exhibits greater hydrotropism compared with wild-type. Our results suggest that amyloplast response and starch reduction occur under light-dark modulation, followed by decreased gravitropism and enhanced hydrotropism in Arabidopsis root.

Original languageEnglish
Article number108198
JournalCell Reports
Volume32
Issue number13
DOIs
Publication statusPublished - 29 Sep 2020

Scopus Subject Areas

  • Biochemistry, Genetics and Molecular Biology(all)

User-Defined Keywords

  • amyloplast
  • gravitropism
  • hydrotropism
  • PGM1
  • root

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