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OsLDDT1, encoding a transmembrane structural DUF726 family protein, is essential for tapetum degradation and pollen formation in rice

文献类型： 外文期刊

作者： Sun, Zhihao 1 ; Liu, Keke 1 ; Chen, Chi 1 ; Chen, Daibo 1 ; Peng, Zequn 1 ; Zhou, Ran 1 ; Liu, Ling 1 ; He, Dengmei 1 ; Duan, Wenjing 1 ; Chen, Hongmei 1 ; Huang, Chenbo 1 ; Ruan, Zheyan 1 ; Zhang, Yingxin 1 ; Cao, Liyong 1 ; Zhan, Xiaodeng 1 ; Cheng, Shihua 1 ; Sun, Lianping 1 ;

作者机构： 1.China Natl Rice Res Inst, Chinese Natl Ctr Rice Improvement, Key Lab Zhejiang Super Rice Res, Hangzhou 311402, Peoples R China

2.China Natl Rice Res Inst, Stat Key Lab Rice Biol, Hangzhou, Peoples R China

3.Northern Rice Res Ctr China Natl Rice Res Inst, Baoqing Northern Rice Res Ctr, Baoqing 155600, Heilongjiang, Peoples R China

4.Heilongjiang Bay Agr Univ, Coll Agron, Daqing 163711, Heilongjiang, Peoples R China

关键词： Rice; Male sterility; OsLDDT1; Fatty acid synthesis; Transmembrane structural protein

期刊名称：PLANT SCIENCE （ 影响因子：5.2； 五年影响因子：5.7 ）

ISSN： 0168-9452

年卷期： 2023 年 329 卷

页码：

收录情况： SCI

摘要： Formation of the pollen wall, which is mainly composed of lipid substances secreted by tapetal cells, is important to ensure pollen development in rice. Although several regulatory factors related to lipid biosynthesis during pollen wall formation have been identified in rice, the molecular mechanisms controlling lipid biosynthesis are unclear. In this study, we isolated the male-sterile rice mutant oslddt1 (leaked and delayed degraded tapetum 1). oslddt1 plants show complete pollen abortion resulting from delayed degradation of the tapetum and blocked formation of Ubisch bodies and pollen walls. OsLDDT1 (LOC_Os03g02170) encodes a DUF726 containing protein of unknown function with highly conserved transmembrane and alpha/beta Hydrolase domains. OsLDDT1 localizes to the endoplasmic reticulum and the gene is highly expressed in rice panicles. Genes involved in regulating fatty acid synthesis and formation of sporopollenin and pollen exine during anther development showed significantly different expression patterns in oslddt1 plants. Interestingly, the wax and cutin contents in mature oslddt1-1 anthers were decreased by 74.07 % and 72.22 % compared to WT, indicating that OsLDDT1 is involved in fatty acid synthesis and affects formation of the anther epidermis. Our results provide as deeper understanding of the role of OsLDDT1 in regulating male sterility and also provide materials for hybrid rice breeding.

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