文献类型： 外文期刊

作者： Fang, Linchuan ¹ ; Wang, Zeming ² ; Su, Lingye ³ ; Gong, Linzhong ⁴ ; Xin, Haiping ³ ;

作者机构： 1.Wuhan Acad Agr Sci, Wuhan, Peoples R China

2.Chinese Acad Sci, Inst Bot, Beijing Key Lab Grape Sci & Enol, Lab Plant Resources, Beijing, Peoples R China

3.Chinese Acad Sci, Sino Africa Joint Res Ctr, Wuhan Bot Garden, Key Lab Plant Germplasm Enhancement & Specialty Ag, Wuhan, Peoples R China

4.Hubei Acad Agr Sci, Inst Fruit Trees & Tea, Wuhan, Peoples R China

关键词： Abiotic stress; Resveratrol; Cold acclimation; Abscisic acid; Reactive oxygen species

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： 2024 年 890 卷

页码：

收录情况： SCI

摘要： The R2R3 Myb transcription factor exhibits a wide range of functions and participates in various biological processes in plant development, secondary metabolism, and abiotic stress tolerance, among others. Vitis Myb14 initially identified for its involvement in resveratrol synthesis in grapevines. In this study, we investigate its role in abiotic stress tolerance. Significant differences in expression were observed between two grape varieties, Vitis amurensis (Cold-hardy) and V. vinifera (Cold-sentitive), under abiotic and hormone treatments. Both VvMyb14 and VaMyb14 demonstrated responsiveness to cold, drought and high salt treatment, but VaMyb14 exhibited a quicker and more pronounced response. To investigate further, we overexpressed VaMyb14 in A. thalina and found that VaMyb14 OE plants showed significantly enhanced cold and drought tolerance compared to wild-type plants. Additionally, the transgenic lines exhibited increased antioxidant enzyme activity, particularly POD ac-tivity, and reduced MDA content. Microarray analysis of VaMyb14 OE plants revealed up-regulation of several ABA metabolism and signal transduction genes, including several LTPs, PP2Cs, RD29B, COR78 and other structural genes, indicating that VaMyb14 has the capacity to reprogram a significant signaling pathway. Furthermore, comparative mRNA sequencing profiling of 35S:VaMyb14 grapevine callus indicated its involve-ment its function involved in ROS scavenging and ABA signaling. These findings collectively demonstrate that Vitis Myb14 serves as a critical regulator in grapevine stress responses, contributing to improved defense against necrotrophic pathogens, enhanced phytoalexin resveratrol production, and increased drought or cold tolerance.