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Mutation of DEFECTIVE EMBRYO SAC1 results in a low seed-setting rate in rice by regulating embryo sac development

文献类型： 外文期刊

作者： Hu, Xia 1 ; Yu, Ping 1 ; Zhang, Yingxin 1 ; Gao, Zhiqiang 2 ; Sun, Bin 3 ; Wu, Weixun 1 ; Deng, Chenwei 4 ; Abbas, Adil 1 ; Hong, Yongbo 1 ; Sun, Lianping 1 ; Liu, Qunen 1 ; Xue, Pao 1 ; Wang, Beifang 1 ; Zhan, Xiaodeng 1 ; Cao, Liyong 1 ; Cheng, Shihua 1 ;

作者机构： 1.China Natl Rice Res Inst, Hangzhou 311400, Zhejiang, Peoples R China

2.Gannan Normal Univ, Ganzhou 341000, Jiangxi, Peoples R China

3.Shanghai Acad Agr Sci, Shanghai 201403, Peoples R China

4.Zhoukou Acad Agr Sci, Zhoukou 466001, Henan, Peoples R China

关键词： Embryo sac; female sterile; fertilization; OsDES1; rice; seed-setting rate

期刊名称：JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：6.9； 五年影响因子：8.0 ）

ISSN： 0022-0957

年卷期： 2023 年 74 卷 5 期

页码：

收录情况： SCI

摘要： The seed-setting rate has a significant effect on grain yield in rice (Oryza sativa L.). Embryo sac development is essential for seed setting; however, the molecular mechanism underlying this process remains unclear. Here, we isolated defective embryo sac1 (des1), a rice mutant with a low seed-setting rate. Cytological examination showed degenerated embryo sacs and reduced fertilization capacity in des1. Map-based cloning revealed a nonsense mutation in OsDES1, a gene that encodes a putative nuclear envelope membrane protein (NEMP)-domain-containing protein that is preferentially expressed in pistils. The OsDES1 mutation disrupts the normal formation of functional megaspores, which ultimately results in a degenerated embryo sac in des1. Reciprocal crosses showed that fertilization is abnormal and that the female reproductive organ is defective in des1. OsDES1 interacts with LONELY GUY (LOG), a cytokinin-activating enzyme that acts in the final step of cytokinin synthesis; mutation of LOG led to defective female reproductive organ development. These results demonstrate that OsDES1 functions in determining the rice seed-setting rate by regulating embryo sac development and fertilization. Our study sheds light on the function of NEMP-type proteins in rice reproductive development. OsDES1encodes a NEMP-domain protein that interacts with a cytokinin-activating enzyme, LOG, to determine the seed-setting rate in rice by regulating embryo sac development.

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