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Promoter variations in a homeobox gene, BrLMI1, contribute to leaf lobe formation in Brassica rapa ssp. chinensis Makino

文献类型： 外文期刊

作者： Li, Pan 1 ; Su, Tongbing 1 ; Li, Hui 1 ; Wu, Yudi 1 ; Wang, Limin 1 ; Zhang, Fenglan 1 ; Wang, Zheng 1 ; Yu, Shuancang 1 ;

作者机构： 1.Beijing Acad Agr & Forestry Sci BAAFS, Beijing Vegetable Res Ctr BVRC, State Key Lab Vegetable Biobreeding, Beijing 100097, Peoples R China

2.Minist Agr, Key Lab Biol & Genet Improvement Hort Crops North, Beijing 100097, Peoples R China

3.Beijing Key Lab Vegetable Germplasm Improvement, Beijing 100097, Peoples R China

期刊名称：THEORETICAL AND APPLIED GENETICS （ 影响因子：5.4； 五年影响因子：5.7 ）

ISSN： 0040-5752

年卷期： 2023 年 136 卷 9 期

页码：

收录情况： SCI

摘要： Key messageBrLMI1is a positive regulatory factor of leaf lobe formation in non-heading Chinese cabbage, and cis-regulatory variations lead to the phenotype of lobed or entire leaf margins.Abstract Leaves are the main consumed organ in leafy non-heading Chinese cabbage (Brassica rapa L. ssp. chinensis Makino), and the shape of the leaves is an important economic trait. However, the molecular regulatory mechanism underlying the lobed-leaf trait in non-heading Chinese cabbage remains unclear. Here, we identified a stable incompletely dominant major locus, qLLA10, for lobed leaf formation in non-heading Chinese cabbage. Based on map-based cloning strategies, BrLMI1, a LATE MERISTEM IDENTITY1 (LMI1)-like gene, was predicted as the candidate gene for qLLA10. Genotyping analysis showed that promoter variations of BrLMI1 in the two parents are responsible for elevating the expression in the lobed-leaf parent and ultimately causing the difference in leaf shape between the two parents, and the promoter activity of BrLMI1 was significantly affected by the promoter variations. BrLMI1 was exclusively localized in the nucleus and expressed mainly at the tip of each lobe. Leaf lobe development was perturbed in BrLMI1-silenced plants produced by virus-induced gene silencing assays, and ectopic overexpression of BrLMI1 in Arabidopsis led to deeply lobed leaves never seen in the wild type, which indicates that BrLMI1 is required for leaf lobe formation in non-heading Chinese cabbage. These findings suggested that BrLMI1 is a positive regulatory factor of leaf lobe formation in non-heading Chinese cabbage and that cis-regulatory variations lead to the phenotype of lobed or entire leaf margins, thus providing a theoretical basis for unraveling the molecular mechanism underlying the lobed leaf phenotype in Brassica crops.

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