Identification of the LBD Gene Family in Lettuce (Lactuca sativa) and Functional Analysis of LsLBD9 in Leaf Development

文献类型： 外文期刊

第一作者： Wang, Chenchen

作者： Wang, Chenchen;Xu, Zhaoyang;Zhou, Jun;Wang, Chenchen;Zhang, Bin;Liu, Xue;Han, Xiangyang;Xu, Zhaoyang;Dong, Kangting;Li, Dayong;Zhang, Bin;Liu, Xue;Han, Xiangyang;Li, Dayong;Zhang, Bin;Liu, Xue;Han, Xiangyang;Li, Dayong;Dong, Kangting

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关键词： Lettuce; LBD gene family; Leaf development; LsLBD9

期刊名称：JOURNAL OF PLANT GROWTH REGULATION （ 影响因子：4.4； 五年影响因子：4.9 ）

ISSN： 0721-7595

年卷期： 2025 年 44 卷 6 期

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收录情况： SCI

摘要： Leaf development directly determines the yield and quality of lettuce (Lactuca sativa L.), an important leafy vegetable of the Asteraceae family. Nevertheless, the molecular mechanisms underlying leaf development in lettuce remain incompletely characterized. The LATERAL ORGAN BOUNDARIES DOMAIN (LBD) transcription factor family plays a pivotal role in leaf development across various plant species. This study presents a comprehensive analysis of the genome-wide characteristics of LBD genes in the lettuce genome. In total, 45 LBD genes (named LsLBD1-45) were identified, showing uneven distribution on nine chromosomes. Phylogenetic analysis divides them into Class I and Class II. Phylogenetic analysis revealed that LsLBD9 was one of the homologs of ASYMMETRIC LEAVES 2 (AS2), a key regulator in leaf development in Arabidopsis thaliana. Transcriptional analyses indicated the potential involvement of LsLBD9 in early leaf development. We proved that LsLBD9 was a cytoplasmic- and nuclear-localized protein, which exhibited self-activation activity in yeast. Overexpression of LsLBD9 resulted in abaxial leaf curling in lettuce. Yeast two-hybrid (Y2H) assay and luciferase complementation assay revealed the interaction between LsLBD9 and LsAS1 (ASYMMETRIC LEAVES 1), suggesting that LsLBD9 may function through interaction with (LsAS1). These results laid the foundation for a deeper understanding of the LBD gene family in lettuce and for further investigation of the molecular mechanisms by which LsLBD9 participates in the development of lettuce leaves.

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