文献类型： 外文期刊
作者： Liu, Erbao 1 ; Zhu, Shangshang 2 ; Du, Mingyu 1 ; Lyu, Huineng 2 ; Zeng, Siyuan 2 ; Liu, Qiangming 3 ; Wu, Guocan 4 ; Jiang, Jianhua 5 ; Dang, Xiaojing 5 ; Dong, Zhiyao 6 ; Hong, Delin 2 ;
作者机构： 1.Anhui Agr Univ, Coll Agr, Hefei 230036, Peoples R China
2.Nanjing Agr Univ, Natl Key Lab Crop Genet & Germplasm Enhancement &, Nanjing 210095, Peoples R China
3.Chongqing Acad Agr Sci, Chongqing 401329, Peoples R China
4.Ningde Inst Agr Sci, Ningde 355017, Peoples R China
5.Anhui Acad Agr Sci, Hefei 230001, Peoples R China
6.Jilin Normal Univ, Coll Life Sci, Jilin 136000, Peoples R China
7.Nanjing Agr Univ, State Key Lab Crop Genet & Germplasm Enhancement, Nanjing 210095, Peoples R China
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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