期刊
NEW PHYTOLOGIST
卷 207, 期 3, 页码 778-789出版社
WILEY
DOI: 10.1111/nph.13395
关键词
defence responses; early infection; ethylene; Heterodera schachtii; jasmonic acid; plant-parasitic nematodes; salicylic acid
资金
- DOC fFORTE fellowship of the Austrian Academy of Sciences
- Austrian Science Fund [L00687, P21067-B12]
- MEYS CR [LDLD14120]
- Austrian Science Fund (FWF) [P21067] Funding Source: Austrian Science Fund (FWF)
- Austrian Science Fund (FWF) [P 21067] Funding Source: researchfish
Heterodera schachtii, a plant-parasitic cyst nematode, invades host roots and induces a specific syncytial feeding structure, from which it withdraws all required nutrients, causing severe yield losses. The system H. schachtii-Arabidopsis is an excellent research model for investigating plant defence mechanisms. Such responses are suppressed in well-established syncytia, whereas they are induced during early parasitism. However, the mechanisms by which the defence responses are modulated and the role of phytohormones are largely unknown. The aim of this study was to elucidate the role of hormone-based defence responses at the onset of nematode infection. First, concentrations of main phytohormones were quantified and the expression of several hormone-related genes was analysed using quantitative real-time (qRT)-PCR or GeneChip. Further, the effects of individual hormones were evaluated vianematode attraction and infection assays using plants with altered endogenous hormone concentrations. Our results suggest a pivotal and positive role for ethylene during nematode attraction, whereas jasmonic acid triggers early defence responses against H.schachtii. Salicylic acid seems to be a negative regulator during later syncytium and female development. We conclude that nematodes are able to impose specific changes in hormone pools, thus modulating hormone-based defence and signal transduction in strict dependence on their parasitism stage.
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