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An ABA-serotonin module regulates root suberization and salinity tolerance.

Hai-Ping Lu1,2, Qing Gao3, Jian-Pu Han4

  • 1State Key Laboratory of Rice Biology, Zhejiang Provincial Key Laboratory of Crop Genetic Resources, The Advanced Seed Institute, Zhejiang University, Hangzhou, 310058, China.

The New Phytologist
|July 25, 2022
PubMed
Summary
This summary is machine-generated.

Abscisic acid (ABA) and serotonin form a regulatory module controlling root suberization in plants. This finding is crucial for developing crops resilient to abiotic stresses and for carbon sequestration strategies.

Keywords:
abscisic acid (ABA)root suberizationsalinity toleranceserotonintryptamine 5-hydroxylase

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Area of Science:

  • Plant Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Root suberization forms a barrier against water and mineral loss.
  • Abscisic acid (ABA) and ethylene regulate suberization in response to nutrient stress.
  • ABA's role in coordinating root microbiota and mineral homeostasis is known, but broader regulatory mechanisms are unclear.

Purpose of the Study:

  • To investigate if the ABA-ethylene regulatory system for root suberization is conserved across plant species.
  • To identify additional key molecules involved in regulating root suberization.
  • To elucidate the molecular mechanisms underlying ABA-mediated root suberization.

Main Methods:

  • Comparative analysis of suberization in rice and Arabidopsis.
  • Gene expression analysis of serotonin biosynthesis pathway genes.
  • Functional studies involving gene overexpression and exogenous serotonin application.
  • Assessing plant tolerance to salt stress.

Main Results:

  • Serotonin acts downstream of ABA in regulating root suberization in both rice and Arabidopsis.
  • ABA represses the transcription of OsT5H, a key gene in serotonin biosynthesis, thereby promoting rice root suberization.
  • Overexpression of OsT5H or exogenous serotonin application inhibits suberization and reduces salt tolerance in rice.

Conclusions:

  • An ABA-serotonin regulatory module controls root suberization, a mechanism likely conserved across plants due to the ubiquity of ABA and serotonin.
  • This discovery has implications for breeding stress-resilient crops and enhancing carbon sequestration through suberin-rich roots.