数字农科院2.0

Transcriptome-Wide Survey of LBD Transcription Factors in Actinidia valvata Under Waterlogging Stress and Functional Analysis of Two AvLBD41 Members

文献类型： 外文期刊

作者： Zhi Li;Ling Gan;Xinghui Wang;Wenjing Si;Haozhao Fang;Jinbao Fang;Yunpeng Zhong;Yameng Yang;Fenglian Ma;Xiaona Ji;Qiang Zhang;Leilei Li;Tao Zhu

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关键词： A. valvata;AvLBD41_7;LBD;transcriptome;waterlogging stress

期刊名称： Horticulturae

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年卷期： 2025 年 11 卷 12 期

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收录情况： SCIE（2025版）

摘要： Actinidia valvata, a promising rootstock for kiwifruit cultivation, demonstrates superior waterlogging tolerance compared with commercial cultivars. Lateral organ boundaries domain (LBD) transcription factors (TFs) are known to be pivotal in plant responses to abiotic stress. Nevertheless, the characterization of the LBD family under waterlogging stress in A. valvata remains limited. In this study, 26 AvLBD genes were identified from a transcriptome dataset, with the majority classified into phylogenetic Class II. Under waterlogging stress, transcript accumulation of most AvLBD41 members, particularly AvLBD41_11 and AvLBD41_7, was markedly increased in roots. Bimolecular fluorescence complementation (BiFC) assays indicated that AvLBD41_7 heterodimerizes with both the AP2/ERF activator AvERF75 and the trihelix repressor AvHRA1, whereas AvLBD41_11 only interacts with AvERF75. Neither AvLBD41 isoform interacts with AvERF73, thereby defining distinct components of a waterlogging-responsive module. Yeast-based assays revealed an absence of transactivation activity for AvLBD41_7, and transient expression analyses confirmed its exclusive nuclear localization. The promoters of both AvLBD41_11 and AvLBD41_7 harbor numerous cis-elements responsive to hormones and abiotic stresses. An AvLBD41_7-derived PCR marker could be used to distinguish A. valvata from A. deliciosa accessions. Collectively, these findings provide a comprehensive functional annotation of the LBD gene family in A. valvata and establish AvLBD41_7 as a potential molecular target for future kiwifruit breeding programs aimed at waterlogging resilience.

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