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Vacuolar processing enzyme positively modulates plant resistance and cell death in response to Phytophthora parasitica infection

2022; Elsevier BV; Volume: 22; Issue: 5 Linguagem: Inglês

10.1016/j.jia.2022.08.124

2352-3425

Xianxian Gao, Ya-ling TANG, Qing-yao SHI, Yushu Wei, Xiao-xue WANG, Weixing Shan, Xiaoyu Qiang,

Plant Pathogenic Bacteria Studies

Oomycete, particularly Phytophthora species, cause the most devastating crop diseases, such as potato late blight, and threaten the sustainable crop production worldwide. Our previous studies identified Resistance to Phytophthora parasitica 1 (RTP1) as a negative regulator of Arabidopsis resistance to multiple biotrophic pathogens and RTP1 loss-of-function plants displayed rapid cell death and reactive oxygen species (ROS) production during early colonization of P. parasitica. In this study, we aim to decipher the mechanism of RTP1-mediated cell death, and identified a member of vaculoar processing enzymes (VPEs), γVPE, playing a role in rtp1-mediated resistance to P. parasitica and cell death occurrence. Our results showed up-regulation of the expression of γVPE as well as increased VPE/caspase 1-like protease activity in P. parasitica-infected rtp1 mutant plants. Besides, we found that the VPE/caspase 1-like protease activity was required for the cell death occurrence in Arabidopsis plants during the infection of P. parasitica as well as rtp1-mediated resistance to P. parasitica. Further pathogenicity assays on either Arabidopsis γvpe mutant plants or leaves of Nicotiana benthamiana with transient overexpression of γVPE demonstrated γVPE could positively affect plant resistance to P. parasitica. Together, our studies suggest that γVPE might function as an important regulator of plant defense and cell death occurrence in response to P. parasitica infection, and VPE/caspase 1-like protease activity is required for rtp1-mediated resistance to P. parasitica.