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Temperature-dependent jumonji demethylase modulates flowering time by targeting H3K36me2/3 in Brassica rapa
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Temperature-dependent jumonji demethylase modulates flowering time by targeting H3K36me2/3 in Brassica rapa
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Journal Article
Temperature-dependent jumonji demethylase modulates flowering time by targeting H3K36me2/3 in Brassica rapa
2024
Overview
Global warming has a severe impact on the flowering time and yield of crops. Histone modifications have been well-documented for their roles in enabling plant plasticity in ambient temperature. However, the factor modulating histone modifications and their involvement in habitat adaptation have remained elusive. In this study, through genome-wide pattern analysis and quantitative-trait-locus (QTL) mapping, we reveal that
BrJMJ18
is a candidate gene for a QTL regulating thermotolerance in thermotolerant
B. rapa
subsp.
chinensis
var.
parachinensis
(or Caixin, abbreviated to
Par
). BrJMJ18 encodes an H3K36me2/3 Jumonji demethylase that remodels H3K36 methylation across the genome. We demonstrate that the BrJMJ18 allele from
Par
(BrJMJ18
Par
) influences flowering time and plant growth in a temperature-dependent manner via characterizing overexpression and CRISPR/Cas9 mutant plants. We further show that overexpression of BrJMJ18
Par
can modulate the expression of
BrFLC3
, one of the five
BrFLC
orthologs. Furthermore, ChIP-seq and transcriptome data reveal that BrJMJ18
Par
can regulate chlorophyll biosynthesis under high temperatures. We also demonstrate that three amino acid mutations may account for function differences in BrJMJ18 between subspecies. Based on these findings, we propose a working model in which an H3K36me2/3 demethylase, while not affecting agronomic traits under normal conditions, can enhance resilience under heat stress in
Brassica rapa
.
The study reveals that the
BrJMJ18
gene, encoding an H3K36me2/3 Jumonji demethylase, is a candidate gene for a QTL regulating thermotolerance in a thermotolerant
Brassica rapa
subspecies, and its allele (
BrJMJ18
Par
) can modulate flowering time, plant growth, and chlorophyll biosynthesis in a temperature-dependent manner.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
/ 45/15
/ 45/91
/ 82/79
/ Alleles
/ Brassica
/ Brassica rapa - growth & development
/ CRISPR
/ Flowers - growth & development
/ Gene Expression Regulation, Plant
/ Genomes
/ Histones
/ Humanities and Social Sciences
/ Jumonji Domain-Containing Histone Demethylases - genetics
/ Jumonji Domain-Containing Histone Demethylases - metabolism
/ Plants, Genetically Modified
/ Science
