Cell Reports (Aug 2023)

BrMYB108 confers resistance to Verticillium wilt by activating ROS generation in Brassica rapa

  • Tongbing Su,
  • Weihong Wang,
  • Zheng Wang,
  • Peirong Li,
  • Xiaoyun Xin,
  • Yangjun Yu,
  • Deshuang Zhang,
  • Xiuyun Zhao,
  • Jiao Wang,
  • Liling Sun,
  • Guihua Jin,
  • Fenglan Zhang,
  • Shuancang Yu

Journal volume & issue
Vol. 42, no. 8
p. 112938

Abstract

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Summary: Increasing plant resistance to Verticillium wilt (VW), which causes massive losses of Brassica rapa crops, is a challenge worldwide. However, few causal genes for VW resistance have been identified by forward genetic approaches, resulting in limited application in breeding. We combine a genome-wide association study in a natural population and quantitative trait locus mapping in an F2 population and identify that the MYB transcription factor BrMYB108 regulates plant resistance to VW. A 179 bp insertion in the BrMYB108 promoter alters its expression pattern during Verticillium longisporum (VL) infection. High BrMYB108 expression leads to high VL resistance, which is confirmed by disease resistance tests using BrMYB108 overexpression and loss-of-function mutants. Furthermore, we verify that BrMYB108 confers VL resistance by regulating reactive oxygen species (ROS) generation through binding to the promoters of respiratory burst oxidase genes (Rboh). A loss-of-function mutant of AtRbohF in Arabidopsis shows significant susceptibility to VL. Thus, BrMYB108 and its target ROS genes could be used as targets for genetic engineering for VL resistance of B. rapa.

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