生物技术通报 ›› 2025, Vol. 41 ›› Issue (4): 198-210.doi: 10.13560/j.cnki.biotech.bull.1985.2024-1031

• 研究报告 • 上一篇    

转录因子VcMYB17调控蓝莓抗旱性的功能研究

田琴(), 刘奎, 吴翔纬, 纪媛媛, 曹一博(), 张凌云()   

  1. 林木资源高效生产全国重点实验室 森林培育与保护教育部重点实验室 北京林业大学林学院,北京 100083
  • 收稿日期:2024-10-21 出版日期:2025-04-26 发布日期:2025-04-25
  • 通讯作者: 曹一博,女,博士,副教授,研究方向 :经济林抗逆分子机理、经济林果实发育调控机制;E-mail: caoyibo@bjfu.edu.cn
    张凌云,女,博士,教授,研究方向 :经济林(果树)果实发育机理与品质调控、林木抗逆分子机理;E-mail: lyzhang@bjfu.edu.cn
  • 作者简介:田琴,女,硕士研究生,研究方向 :经济林(果树)培育与利用;E-mail: 2311925828@qq.com
  • 基金资助:
    山东省重点研发计划(2024LZGCQY025);北京林业大学“5·5工程”科研创新团队项目(BLRC2023B08)

Functional Study of Transcription Factor VcMYB17 in Regulating Drought Tolerance in Blueberry

TIAN Qin(), LIU Kui, WU Xiang-wei, JI Yuan-yuan, CAO Yi-bo(), ZHANG Ling-yun()   

  1. State Key Laboratory of Efficient Production of Forest Resources, Key Laboratory of Forest Silviculture and Conservation of the Ministry of Education, College of Forestry, Beijing Forestry University, Beijing 100083
  • Received:2024-10-21 Published:2025-04-26 Online:2025-04-25

摘要:

目的 解析转录因子VcMYB17在蓝莓响应干旱胁迫过程中的功能,为蓝莓品种改良提供基因资源。 方法 利用生物信息学分析VcMYB17的基本特征。通过RT-qPCR分析VcMYB17的组织表达特异性,检测不同激素处理和干旱胁迫下VcMYB17的表达水平,以及过表达VcMYB17对抗旱应答基因表达水平的影响。瞬时转化烟草检测VcMYB17的亚细胞定位,并在酵母中验证其是否具有转录激活活性。利用农杆菌侵染获得VcMYB17-OE转基因拟南芥及蓝莓愈伤,观察转基因材料的干旱表型,并测定存活率、鲜重、失水率、相对电导率、MDA含量、POD和SOD活性。 结果 VcMYB17是R2R3型MYB转录因子。VcMYB17在蓝莓叶片中高表达,外源施加ABA、GA、MeJA、SA及PEG处理均导致VcMYB17表达水平下调。VcMYB17定位于细胞核,具有转录激活活性。干旱胁迫下,过表达VcMYB17的拟南芥植株及蓝莓愈伤生长受到明显抑制,MDA积累增加,但SOD、POD活性降低;且VcMYB17-OE植株中抗旱应答基因,如AtERD1AtERD15AtP5CS1AtRD29AAtRD22AtDREB1A的表达显著低于野生型。 结论 VcMYB17是定位于细胞核的R2R3型MYB转录因子,ABA、GA、MeJA、SA及PEG处理抑制VcMYB17的表达。过表达VcMYB17抑制抗旱应答基因的表达,导致拟南芥及蓝莓愈伤的抗旱性下降。

关键词: VcMYB17, 基因功能, 蓝莓, 抗旱性, 干旱胁迫, 转基因植物

Abstract:

【Objectve】This study aims to clarify the functional mechanism of the transcription factor VcMYB17 in blueberry drought stress response, providing potential genetic resources for blueberry cultivar improvement. Method Bioinformatics methods were employed to characterize the basic properties of VcMYB17. RT-qPCR was used to analyze the tissue specificity of VcMYB17, the response of VcMYB17 to different hormones and drought stress, and the effect of overexpression of VcMYB17 on drought resistance genes in Arabidopsis thaliana. Subcellular localization of VcMYB17 was examined in transiently transformed tobacco, and its transcriptional activating activity was verified in yeast. The VcMYB17-OE transgenic blueberry callus and A. thaliana were obtained through Agrobacterium infection. Drought stress phenotypes were evaluated, including measurements of survival rate, fresh weight, water loss rate, relative conductivity, malondialdehyde (MDA) content, and peroxidase (POD), and superoxide dismutase (SOD) activities. Result VcMYB17 is an R2R3 type MYB transcription factor that is highly expressed in the leaves of blueberry. Exogenous treatment with ABA, GA, MeJA, SA and PEG causes the expressions of VcMYB17 to be downregulated. VcMYB17 is localized in the nucleus and has transcriptional activating activity. Under drought stress, the overexpression of VcMYB17 inhibits plant growth, makes plants accumulate more MDA content and decrease POD and SOD activities. Furthermore, the expressions of drought response genes such as AtERD1, AtERD15, AtP5CS1, AtRD29A, AtRD22 and AtDREB1A in VcMYB17-OE plants are significantly lower than that in wild type plants. Conclusion VcMYB17 is an R2R3 MYB transcription factor localized in the nucleus. The expression of VcMYB17 is inhibited by ABA, GA, MeJA, SA and PEG. Overexpression of VcMYB17 decreases the expression of drought response genes, resulting in reduced drought resistance in A. thaliana and blueberry callus.

Key words: VcMYB17, gene function, blueberry, resistance to drought, drought stress, transgenic plant