LAX1, functioning with MADS-box genes, determines normal palea development in rice

文献类型： 外文期刊

第一作者： Liu, Erbao

作者： Liu, Erbao;Du, Mingyu;Zhu, Shangshang;Lyu, Huineng;Zeng, Siyuan;Hong, Delin;Liu, Qiangming;Wu, Guocan;Jiang, Jianhua;Dang, Xiaojing;Dong, Zhiyao;Hong, Delin

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关键词： Oryza sativa; Palea length; Lax1-7; MADS-box genes; Functional analysis

期刊名称：GENE （ 影响因子：3.5； 五年影响因子：3.3 ）

ISSN： 0378-1119

年卷期： 2023 年 883 卷

页码：

收录情况： SCI

摘要： Normal floral organ development in rice is necessary for grain formation. Many MADS-box family genes that belong to ABCDE model have been widely implicated in rice flower development. The LAX1 allele encodes a plant-specific basic helix-loop-helix (bHLH) transcription factor, which is the main regulator of axillary meristem formation in rice. However, the molecular mechanisms of LAX1 allele together with MADS-box family genes underlying palea development have not been reported. We found a short palea mutant plant in a population of indica rice variety 9311 treated with cobalt 60. We report the map-based cloning and characterization of lax1-7, identified as a new mutant allele of the LAX1 locus, and the role of its wild-type allele LAX1 in rice palea development. Through complementary experiments, combined with genetic and molecular biological analyses, the function of the LAX1 allele was determined. We showed that LAX1 allele is expressed specifically in young spikelets and encodes a nucleus-localized protein. In vitro and in vivo experiments revealed that the LAX1 protein physically interacts with OsMADS1, OsMADS6 and OsMADS7. The LAX1 allele is pleiotropic for the maintenance of rice palea identity via cooperation with MADS-box genes and other traits, including axillary meristem initiation, days to heading, plant height, panicle length and spikelet fertility.

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