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POLLEN STERILITY, a novel suppressor of cell division, is required for timely tapetal programmed cell death in rice

文献类型： 外文期刊

作者： Che, Ronghui 1 ; Hu, Bin 1 ; Wang, Wei 1 ; Xiao, Yunhua 1 ; Liu, Dapu 2 ; Yin, Wenchao 2 ; Tong, Hongning 2 ; Chu, Chengc 1 ;

作者机构： 1.Chinese Acad Sci, Innovat Acad Seed Design, Inst Genet & Dev Biol, State Key Lab Plant Genom, Beijing 100101, 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.Univ Jinan, Sch Biol & Sci Technol, Jinan 250022, Peoples R China

4.South China Agr Univ, Coll Agr, Guangzhou 510642, Peoples R China

关键词： programmed cell death; tapetum; pollen sterility; grain size; rice

期刊名称：SCIENCE CHINA-LIFE SCIENCES （ 影响因子：6.038； 五年影响因子：4.754 ）

ISSN： 1674-7305

年卷期：

页码：

收录情况： SCI

摘要： Timely programmed cell death (PCD) of the tapetum supplying nutrients to microspores is a prerequisite for normal pollen development. Here we identified a unique mutant of rice (Oryza sativa L.), pollen sterility (post), which showed aborted pollens accompanied with extra-large husks. Due to failure of timely PCD of tapetal cells, post exhibited abnormal pollen wall patterning and defective pollen grains. By map-based cloning, we identified a causal gene, POST, encoding a novel protein which is ubiquitously localized in cells. RNA in situ hybridization showed that POST is highly detected in the tapetum and microspores at stages 8 and 9. Transcriptome analysis indicated that POST could function as an important regulator of the metabolic process involved in tapetal PCD. Compared with wild-type rice, post mutant has an increased cell number resulting from elevated expression of cell cycle associated genes in grain husks. Overexpression of POST inhibits grain size in wild type, while appropriate expression of POST in post mutant can recover the seed fertility but has little effect on the large grains, illustrating that fine-tuning of POST expression could be a potential strategy for rice yield improvement. The connection between cell division and cell death conferred by POST provides novel insights into the understanding of the tapetal PCD process.

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