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Msp40 effector of root-knot nematode manipulates plant immunity to facilitate parasitism

文献类型: 外文期刊

作者: Niu, Junhai 1 ; Liu, Pei 1 ; Liu, Qian 1 ; Chen, Changlong 1 ; Guo, Quanxin 1 ; JunmeiYin; GuangsuiYang; Jian, Heng 1 ;

作者机构: 1.China Agr Univ, Dept Plant Pathol, Beijing 100193, Peoples R China

2.China Agr Univ, Key Lab Plant Pathol, Minist Agr, Beijing 100193, Peoples R China

3.CATAS Key Lab Crop Gene Resources & Germplasm Enh, Trop Crops Genet Resources Inst, Danzhou 571737, Hainan, Peoples R

期刊名称:SCIENTIFIC REPORTS ( 影响因子:4.379; 五年影响因子:5.133 )

ISSN: 2045-2322

年卷期: 2016 年 6 卷

页码:

收录情况: SCI

摘要: Root-knot nematodes (RKNs) are obligate biotrophic parasites that invade plant roots and engage in prolonged and intimate relationships with their hosts. Nematode secretions, some of which have immunosuppressing activity, play essential roles in successful parasitism; however, their mechanisms of action remain largely unknown. Here, we show that the RKN-specific gene MiMsp40, cloned from Meloidogyne incognita, is expressed exclusively in subventral oesophageal gland cells and is strongly upregulated during early parasitic stages. Arabidopsis plants overexpressing MiMsp40 were more susceptible to nematode infection than were wild type plants. Conversely, the host-derived MiMsp40 RNAi suppressed nematode parasitism and/or reproduction. Moreover, overexpression of MiMsp40 in plants suppressed the deposition of callose and the expression of marker genes for bacterial elicitor elf18-triggered immunity. Transient expression of MiMsp40 prevented Bax-triggered defence-related programmed cell death. Co-agroinfiltration assays indicated that MiMsp40 also suppressed macroscopic cell death triggered by MAPK cascades or by the ETI cognate elicitors R3a/Avr3a. Together, these results demonstrate that MiMsp40 is a novel Meloidogyne-specific effector that is injected into plant cells by early parasitic stages of the nematode and that plays a role in suppressing PTI and/or ETI signals to facilitate RKN parasitism.

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