Two divergent immune receptors of the allopolyploid Nicotiana benthamiana reinforce the recognition of a fungal microbe-associated molecular pattern VdEIX3
文献类型： 外文期刊
作者： Wang, Nan 1 ; Yin, Zhiyuan 2 ; Zhao, Yaning 3 ; Li, Zhengpeng 4 ; Dou, Daolong 2 ; Wei, Lihui 1 ;
作者机构： 1.Jiangsu Acad Agr Sci, Inst Plant Protect, Nanjing, Peoples R China
2.China Agr Univ, Coll Plant Protect, Beijing, Peoples R China
3.Nanjing Agr Univ, Coll Plant Protect, Nanjing, Peoples R China
4.Huaiyin Normal Univ, Sch Life Sci, Jiangsu Key Lab Ecoagr Biotechnol Hongze Lake, Huaian, Peoples R China
关键词： hybrid vigor; divergent evolution; LRR-RLP; ethylene-inducing xylanase (EIX); microbe-associated molecular pattern (MAMP)
期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：6.627； 五年影响因子：7.255 ）
ISSN： 1664-462X
年卷期： 2022 年 13 卷
页码：
收录情况： SCI
摘要： The allotetraploid Solanaceae plant Nicotiana benthamiana contains two closely related receptor-like proteins (RLPs), NbEIX2 and NbRXEG1, which regulate the recognition of VdEIX3 and PsXEG1, respectively. VdEIX3, PsXEG1, and their homologs represent two types of microbe-associated molecular patterns (MAMPs) that are widespread in diverse pathogens. Here, we report that NbRXEG1 also participates in VdEIX3 recognition. Both eix2 and rxeg1 single mutants exhibited significantly impaired but not abolished ability to mediate VdEIX3-triggered immune responses, which are nearly abolished in eix2 rxeg1 double mutants. Moreover, a dominant negative mutant of eix2 that contains a 60 bp deletion failed to respond to VdEIX3 and could suppress VdEIX3-induced cell death in the wild-type N. benthamiana. Further phylogenetic analyses showed that NbEIX2 and NbRXEG1 are obtained from different diploid ancestors by hybridization. These results demonstrate that the allotetraploid N. benthamiana recognizes two types of MAMPs by two homologous but diverged RLPs, which provides a model in which an allopolyploid plant probably exhibits defense hybrid vigor by acquiring divergent immune receptors from different ancestors.
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