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Mutations in the Rice OsCHR4 Gene, Encoding a CHD3 Family Chromatin Remodeler, Induce Narrow and Rolled Leaves with Increased Cuticular Wax

文献类型： 外文期刊

作者： Guo, Tingting 1 ; Wang, Daofeng 2 ; Fang, Jingjing 2 ; Zhao, Jinfeng 2 ; Yuan, Shoujiang 3 ; Xiao, Langtao 1 ; Li, Xue 1 ;

作者机构： 1.Hunan Agr Univ, Coll Biosci & Biotechnol, Hunan Prov Key Lab Crop Germplasm Innovat & Utili, Hunan Prov Key Lab Phytohormones, Changsha 410128, Hunan, Peoples R China

2.Chinese Acad Agr Sci, Inst Crop Sci, Natl Key Facil Crop Gene Resources & Genet Improv, Beijing 100081, Peoples R China

3.Shandong Rice Res Inst, Jinan 250100, Shandong, Peoples R China

关键词： auxin; chromatin remodeling factor; cuticular wax; drought tolerance; epigenetic regulation; leaf width; histone modification; narrow leaf; OsCHR4; rice

期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：5.923； 五年影响因子：6.132 ）

ISSN： 1422-0067

年卷期： 2019 年 20 卷 10 期

页码：

收录情况： SCI

摘要： Leaf blade width, curvature, and cuticular wax are important agronomic traits of rice. Here, we report the rice Oschr4-5 mutant characterized by pleiotropic phenotypes, including narrow and rolled leaves, enhanced cuticular wax deposition and reduced plant height and tiller number. The reduced leaf width is caused by a reduced number of longitudinal veins and increased auxin content. The cuticular wax content was significantly higher in the Oschr4-5 mutant, resulting in reduced water loss rate and enhanced drought tolerance. Molecular characterization reveals that a single-base deletion results in a frame-shift mutation from the second chromodomain of OsCHR4, a CHD3 (chromodomain helicase DNA-binding) family chromatin remodeler, in the Oschr4-5 mutant. Expressions of seven wax biosynthesis genes (GL1-4, WSL4, OsCER7, LACS2, LACS7, ROC4 and BDG) and four auxin biosynthesis genes (YUC2, YUC3, YUC5 and YUC6) was up-regulated in the Oschr4-5 mutant. Chromatin immunoprecipitation assays revealed that the transcriptionally active histone modification H3K4me3 was increased, whereas the repressive H3K27me3 was reduced in the upregulated genes in the Oschr4-5 mutant. Therefore, OsCHR4 regulates leaf morphogenesis and cuticle wax formation by epigenetic modulation of auxin and wax biosynthetic genes expression.

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[1]Mutations in the Rice OsCHR4 Gene, Encoding a CHD3 Family Chromatin Remodeler, Induce Narrow and Rolled Leaves with Increased Cuticular Wax. Guo, Tingting,Xiao, Langtao,Wang, Daofeng,Fang, Jingjing,Zhao, Jinfeng,Li, Xueyong,Yuan, Shoujiang. 2019

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