木寡糖提高拟南芥抗病性

Xylo-oligosaccharides Elicits Disease Resistance in Arabidopsis

木寡糖是一种植物源寡糖,对动物体的生理功能多且显著,而其是否作为寡糖素诱发植物防卫尚不明确。本文分析了不同浓度木寡糖诱导拟南芥植株对不同营养型病原的抗性。结果表明,木寡糖能诱发拟南芥对半活体病原细菌丁香假单胞菌番茄致病变种、活体病原烟草花叶病毒和死体病原真菌核盘菌的抗性,且具有剂量依赖效应,随着木寡糖浓度的提高到100μg/mL,对Pst DC3000和TMV诱导抗病效果逐渐增强;当木寡糖浓度提高到50μg/mL,对核盘菌的诱导抗病效果不再升高;说明木寡糖是一种新的可诱发拟南芥广谱抗病性的寡糖素。本研究为进一步解析木寡糖诱发植物免疫的信号传导和开发新的病害控制策略提供了依据。

Plant-origined xylo-oligosaccharides(XOS)have many excellent physiological and biological properties in animals.However,whether XOS acts as an oligosaccharins to induce plant defense remains unclear.In this study,the induced disease resistance to different pathogens upon XOS with different concentrations was investigated.Here,we found that XOS can induce plant resistance against hemibiotrophic pathogen Pseudomonas syringae pv.tomato DC3000,biotrophic pathogen Tobacco mosaic virus and necrotrophic pathogen Sclerotinia sclerotiorum in a dose-dependent manner.The induced resistance effect to Pst DC3000 and TMV increased as XOS concentration increased to 100μg/mL.While XOS concentration increased to 50μg/mL,the induced resistance effect to S.sclerotiorum was no longer rising.The results indicated that another new biotic sugar,XOS,can broadly elicit disease resistance in Arabidopsis,which provide a basis for elucidating the signal transduction of disease resistance induced by XOS and designing efficient strategies for plant disease control.