1. PmHs1pro‐1 monitors Bsursaphelenchus xylophilus infection and activates defensive response in resistant Pinus massoniana.
- Author
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Xie, Yini, Liu, Bin, Zhou, Zhichun, Gao, Kai, Yin, Hengfu, Zhao, Yunxiao, and Liu, Qinghua
- Abstract
Plant resistance (
R ) genes play a crucial role in the detection of effector proteins secreted by pathogens, either directly or indirectly, as well as in the subsequent activation of downstream defence mechanisms. However, little is known about howR genes regulate the defence responses of conifers, particularlyPinus massoniana , against the destructive pine wood nematode (PWN;Bursaphelenchus xylophilus ). Here, we isolated and characterisedPmHs1 pro‐1 , a nematode‐resistance gene ofP. massoniana , using bioinformatics, molecular biology, histochemistry and transgenesis. Tissue‐specific expressional pattern and localisation ofPmHs1 pro‐1 suggested that it was a crucial positive regulator in response to PWN attack in resistantP. massoniana . Meanwhile, overexpression ofPmHs1 pro‐1 was found to activate reactive oxygen species (ROS) metabolism‐related enzymes and the expressional level of their key genes, including superoxide dismutase, peroxidase and catalase. In addition, we showed thatPmHs1 pro‐1 directly recognised the effector protein BxSCD1of PWN, and induced the ROS burst responding to PWN invasion in resistantP. massoniana . Our findings illustrated the molecular framework ofR genes directly recognising the effector protein of pathology in pine, which offered a novel insight into the plant–pathogen arms race. [ABSTRACT FROM AUTHOR]- Published
- 2024
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