Temperature-dependent jumonji demethylase modulates flowering time by targeting H3K36me2/3 in Brassica rapa
文献类型： 外文期刊
作者： Xin, Xiaoyun 1 ; Li, Peirong 1 ; Zhao, Xiuyun 1 ; Yu, Yangjun 1 ; Wang, Weihong 1 ; Jin, Guihua 1 ; Wang, Jiao 1 ; Sun, Liling 1 ; Zhang, Deshuang 1 ; Zhang, Fenglan 1 ; Yu, Shuancang 1 ; Su, Tongbing 1 ;
作者机构： 1.Beijing Acad Agr & Forestry Sci, Beijing Vegetable Res Ctr, State Key Lab Vegetable Biobreeding, Beijing, Peoples R China
2.Beijing Acad Agr & Forestry Sci, Natl Engn Res Ctr Vegetables, Beijing Vegetable Res Ctr, Beijing, Peoples R China
3.Beijing Key Lab Vegetable Germplasms Improvement, Beijing, Peoples R China
4.Key Lab Biol & Genet Improvement Hort Crops North, Beijing, Peoples R China
期刊名称：NATURE COMMUNICATIONS （ 影响因子：14.7； 五年影响因子：16.1 ）
ISSN：
年卷期： 2024 年 15 卷 1 期
页码：
收录情况： SCI
摘要： 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.
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