Ectopic Expression of HbRPW8-a from Hevea brasiliensis Improves Arabidopsis thaliana Resistance to Powdery Mildew Fungi (Erysiphe cichoracearum UCSC1)
文献类型： 外文期刊
作者： Li, Xiaoli 1 ; He, Qiguang 2 ; Liu, Yuhan 1 ; Xu, Xinze 1 ; Xie, Qingbiao 3 ; Li, Zhigang 1 ; Lin, Chunhua 1 ; Liu, Wenbo 1 ; Chen, Daipeng 1 ; Li, Xiao 1 ; Miao, Weiguo 1 ;
作者机构： 1.Hainan Univ, Key Lab Green Prevent & Control Trop Plant Dis &, Minist Educ, Sch Plant Protect, Haikou 570228, Hainan, Peoples R China
2.Chinese Acad Trop Agr Sci, Hainan Prov Key Lab Trop Crops Cultivat & Physiol, Key Lab Biol & Genet Resources Rubber Tree, Minist Agr & Rural Affairs,Rubber Res Inst, Haikou 571101, Hainan, Peoples R China
3.Hainan Univ, Inst Trop Crops, Hainan Key Lab Sustainable Utilizat Trop Bioresou, Haikou 570228, Hainan, Peoples R China
关键词： Hevea brasiliensis; RPW8; powdery mildew; resistance gene; salicylic acid
期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：6.208； 五年影响因子：6.628 ）
ISSN：
年卷期： 2022 年 23 卷 20 期
页码：
收录情况： SCI
摘要： The RPW8s (Resistance to Powdery Mildew 8) are atypical broad-spectrum resistance genes that provide resistance to the powdery mildew fungi. Powdery mildew of rubber tree is one of the serious fungal diseases that affect tree growth and latex production. However, the RPW8 homologs in rubber tree and their role of resistance to powdery mildew remain unclear. In this study, four RPW8 genes, HbRPW8-a, b, c, d, were identified in rubber tree, and phylogenetic analysis showed that HbRPW8-a was clustered with AtRPW8.1 and AtRPW8.2 of Arabidopsis. The HbRPW8-a protein was localized on the plasma membrane and its expression in rubber tree was significantly induced upon powdery mildew infection. Transient expression of HbRPW8-a in tobacco leaves induced plant immune responses, including the accumulation of reactive oxygen species and the deposition of callose in plant cells, which was similar to that induced by AtRPW8.2. Consistently, overexpression of HbRPW8-a in Arabidopsis thaliana enhanced plant resistance to Erysiphe cichoracearum UCSC1 and Pseudomonas syringae pv. tomato DC30000 (PstDC3000). Moreover, such HbRPW8-a mediated resistance to powdery mildew was in a salicylic acid (SA) dependent manner. Taken together, we demonstrated a new RPW8 member in rubber tree, HbRPW8-a, which could potentially contribute the resistance to powdery mildew.
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