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BASIC PENTACYSTEINE2 fine-tunes corm dormancy release in Gladiolus.

Jingru Li1, Wenqiang Pan1, Jiahui Liang1,2

  • 1Beijing Key Laboratory of Development and Quality Control of Ornamental Crops, Department of Ornamental Horticulture, China Agricultural University, Beijing 100193, China.

Plant Physiology
|January 20, 2023
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Summary
This summary is machine-generated.

Bud dormancy release in Gladiolus is accelerated by GhBPC2, a protein that epigenetically regulates gene expression. This process involves histone modifications and targets key genes like GhABI5, impacting plant growth.

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Area of Science:

  • Plant Biology
  • Epigenetics
  • Hormone Signaling

Background:

  • Bud dormancy is crucial for geophyte growth and flowering, but its regulation, unlike seed dormancy, remains poorly understood.
  • Abscisic acid (ABA) is the primary hormone regulating dormancy, with cold storage promoting dormancy release in Gladiolus by reducing ABA levels.
  • Epigenetic mechanisms controlling ABA-related processes during dormancy release are largely unknown.

Purpose of the Study:

  • To investigate the epigenetic mechanisms underlying cold-induced corm dormancy release (CDR) in Gladiolus.
  • To identify key regulatory factors involved in ABA signaling during CDR.
  • To elucidate the role of GhBPC2 in the epigenetic regulation of CDR.

Main Methods:

  • Chromatin immunoprecipitation sequencing (ChIP-seq) to analyze histone modifications.
  • Gene expression analysis to assess the impact of GhBPC2 on target genes.
  • Biochemical assays to confirm protein-DNA interactions and recruitment of regulatory complexes.

Main Results:

  • GhBPC2 directly binds to the GhNCED and GhABI5 loci, down-regulating their expression to promote CDR.
  • Histone modifications at the GhABI5 locus change during CDR, with increased H3K27me3 and decreased H3K4me3.
  • GhBPC2 recruits PRC2 and GhEBS to modulate H3K27me3 and H3K4me3, thereby fine-tuning GhABI5 expression.

Conclusions:

  • GhBPC2 epigenetically regulates corm dormancy release in Gladiolus.
  • The mechanism involves GhBPC2 mediating GhABI5 expression through histone modifications and recruitment of PRC2 and GhEBS.
  • This study reveals novel insights into the epigenetic control of plant dormancy.