数字农科院2.0

Mutations In The Rice Oschr4 G.ene, Encoding A Chd3 F amily Chromatin Remodeler, Induce Narrow And Rolled Leaves With Increased Cuticular Wax

文献类型： 外文期刊

作者： Wang, Daofeng;Fang, Jingjing;Xiao, Langtao;Guo, Tingting;Yuan, Shoujiang;Zhao, Jinfeng;Li, Xueyong

作者机构：

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

ISSN： 1422-0067

年卷期： 2019 年 20 卷 10 期

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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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