Characterization of the 'Oat-Like Rice' Caused by a Novel AlleleOsMADS1(Olr)Reveals Vital Importance ofOsMADS1in Regulating Grain Shape inOryza sativaL.

文献类型： 外文期刊

第一作者： Li, Penghui

作者： Li, Penghui;Li, Hui;Liu, Zhijian;Zhuang, Yong;Wei, Ming;Gu, Yuanyang;Liu, Yangxuan;Sun, Xiuqiang;Tang, Yuying;Yue, Lu;Lu, Longxiang;Huang, Weizao;Tu, Shengbin;Wang, Songhu;Li, Penghui;Liu, Zhijian;Zhuang, Yong;Wei, Ming;Gu, Yuanyang;Liu, Yangxuan;Sun, Xiuqiang;Tang, Yuying;Yue, Lu;Lu, Longxiang;Tu, Shengbin;Wang, Songhu;Li, Hui;Huang, Weizao;Tu, Shengbin;Wang, Songhu;Luo, Dagang

作者机构：

关键词： Oat-like rice; OsMADS1(Olr); Elongated leafy lemmas and paleae; Grain shape; Conjugated twin brown rice; Rice

期刊名称：RICE （ 影响因子：4.783； 五年影响因子：5.23 ）

ISSN： 1939-8425

年卷期： 2020 年 13 卷 1 期

页码：

收录情况： SCI

摘要： Background Grain shape is a critical agronomic trait affecting grain yield and quality. Exploration and functional characterization of grain shape-related genes will facilitate rice breeding for higher quality and yield. Results Here, we characterized a recessive mutant named Oat-like rice for its unique grain shape which highly resembles oat grains. The Oat-like rice displayed abnormal floral organs, an open hull formed by remarkably elongated leafy lemmas and paleae, occasionally formed conjugated twin brown rice, an aberrant grain shape and a low seed setting rate.By map-based cloning, we discovered that Oat-like rice harbors a novel allele ofOsMADS1gene (OsMADS1(Olr)), which has a spontaneous point mutation that causes the substitution of an amino acid that is highly conserved in the MADS-box domain of the MADS-box family. Further linkage analysis indicated that the point mutation in theOsMADS1(Olr)is associated with Oat-like rice phenotype, and expression analysis of theOsMADS1by qRT-PCR and GUS staining also indicated that it is highly expressed in flower organs as well as in the early stages of grain development. Furthermore,OsMADS1(Olr)-overexpressing plants showed similar phenotypes of Oat-like rice in grain shape, possibly due to the dominant negative effect. AndOsMADS1-RNAi plants also displayed grain phenotypes like Oat-like rice. These results suggested thatOsMADS1(Olr)is responsible for the Oat-like rice phenotype including aberrant grain shape. Moreover, the expression levels of representative genes related to grain shape regulation were apparently altered in Oat-like rice,OsMADS1(Olr)-overexpressing andOsMADS1-RNAi transgenic plants. Finally, compared with Oat-like rice,OsMADS1(Olr)-overexpressing andOsMADS1-RNAi plants, mild phenotype of seed-specificOsMADS1-RNAi transgenic plants indicated thatOsMADS1may has has a direct regulation role in grain development and the grain phenotypes of Oat-like rice,OsMADS1(Olr)-overexpressing andOsMADS1-RNAi plants are majorly caused by the abnormal lemma and palea development. Conclusions Altogether, our results showed that grain shape and a low seed setting rate of the notable 'Oat-like rice' are caused by a spontaneous point mutation in the novel alleleOsMADS1(Olr). Furthermore, our findings suggested thatOsMADS1mediates grain shape possibly by affecting the expression of representative genes related to grain shape regulation. Thus, this study not only revealed thatOsMADS1plays a vital role in regulating grain shape of rice but also highlighted the importance and value ofOsMADS1to improve the quality and yield of rice by molecular breeding.

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