期刊
JOURNAL OF EXPERIMENTAL BOTANY
卷 67, 期 1, 页码 107-118出版社
OXFORD UNIV PRESS
DOI: 10.1093/jxb/erv440
关键词
Heterodera schachtii; MAPK phosphatase; MAPK signalling; PP2C phosphatase; plant-pathogen response; plant-nematode interactions
资金
- Austrian Science Fund (FWF) [L687, I255, P27254, P21067]
- Austrian Academy of Science (DOC fFORTE fellowship)
- Lithuanian-Swiss co-operation programme to reduce economic and social disparities within the enlarged EU [CH-3-SMM-01/10]
- Research Council of Lithuania [MIP-003/2014]
Plant-parasitic cyst nematodes infect plants and form highly sophisticated feeding sites in roots. It is not known which plant cell signalling mechanisms trigger plant defence during the early stages of nematode parasitism. Mitogen-activated protein kinases (MAPKs) are central components of protein phosphorylation cascades transducing extracellular signals to plant defence responses. MAPK phosphatases control kinase activities and the signalling outcome. The involvement and the role of MPK3 and MPK6, as well as the MAPK phosphatase AP2C1, is demonstrated during parasitism of the beet cyst nematode Heterodera schachtii in Arabidopsis. Our data reveal notable activation patterns of plant MAPKs and the induction of AP2C1 suggesting the attenuation of defence signalling in plant cells during early nematode infection. It is demonstrated that the ap2c1 mutant that is lacking AP2C1 is more attractive but less susceptible to nematodes compared with the AP2C1-overexpressing line. This implies that the function of AP2C1 is a negative regulator of nematode-induced defence. By contrast, the enhanced susceptibility of mpk3 and mpk6 plants indicates a positive role of stress-activated MAPKs in plant immunity against nematodes. Evidence is provided that phosphatase AP2C1, as well as AP2C1-targeted MPK3 and MPK6, are important regulators of plant-nematode interaction, where the co-ordinated action of these signalling components ensures the timely activation of plant defence.
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