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The PtrC2H2.2-6-PtrCYP86A7/A8 Module Regulates Poplar Drought Tolerance Through Mediating Cutin and Wax Biosynthesis

Jiu-Jiu Zhao1, Shuang-Lian Deng1, Hao Li1

  • 1Forest Ecology and Conservation in the Upper Reaches of the Yangtze River Key Laboratory of Sichuan Province, Sichuan Mt. Emei Forest Ecosystem National Observation and Research Station, College of Forestry, Sichuan Agricultural University, Chengdu, China.

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|October 24, 2025
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Summary

A novel regulatory pathway involving PtrPPK1 and PtrC2H2.2-6 controls plant drought tolerance by modulating cuticle biosynthesis genes, offering targets for developing resilient trees.

Keywords:
PopulusPtrC2H2.2‐6PtrCYP86A7PtrCYP86A8drought

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Area of Science:

  • Plant Biology
  • Molecular Genetics
  • Biochemistry

Background:

  • The plant cuticle is vital for reducing water loss and enhancing drought tolerance.
  • CYP86A genes are key regulators of cuticle biosynthesis, but their expression control is not fully understood.

Purpose of the Study:

  • To elucidate the regulatory mechanisms controlling cuticle biosynthesis genes under water stress.
  • To identify key factors involved in poplar drought tolerance.

Main Methods:

  • Bioinformatics and biochemical analyses to identify protein interactions.
  • Gene expression analysis (transcriptional and protein levels).
  • RNA interference (RNAi) and overexpression studies in poplar.

Main Results:

  • A C2H2-type transcription factor, PtrC2H2.2-6, was identified and downregulated under water stress.
  • PtrC2H2.2-6 negatively regulates PtrCYP86A7 and PtrCYP86A8, key cuticle biosynthesis genes.
  • PtrPPK1 phosphorylates and degrades PtrC2H2.2-6, relieving repression and enhancing drought tolerance.
  • Silencing PtrC2H2.2-6 or overexpressing PtrCYP86A7/A8 improved wax accumulation and drought resistance.

Conclusions:

  • The PtrPPK1-PtrC2H2.2-6-PtrCYP86A7/A8 module is a critical regulator of drought tolerance in poplar.
  • This pathway modulates wax accumulation and water retention capacity.
  • Potential targets for breeding drought-resistant forest trees have been identified.