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首页> 外文期刊>Plant Pathology >Potential role for salicylic acid in induced resistance of asparagus roots to Fusarium oxysporum f.sp.asparagi
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Potential role for salicylic acid in induced resistance of asparagus roots to Fusarium oxysporum f.sp.asparagi

机译：水杨酸在诱导芦笋根对尖孢镰刀菌抗性中的潜在作用

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摘要

Pre-inoculation of asparagus(Asparagus officinalis)roots with selected nonpathogenic isolates of Fusarium oxysporum(npFo)has previously been shown to induce systemic resistance against infection by F.oxysporum f.sp.asparagi(Foa)through activation of plant-defence mechanisms.To elucidate the putative npFo-mediated defence pathways,the effect of salicylic acid(SA)was examined in a split-root system of asparagus where one half of the seedling root system was drenched with SA and the activation of defence responses was measured subsequently on the remaining roots.SA-treated plants exhibited enhanced systemic resistance,with a significant reduction in disease severity of the roots inoculated with Foa,compared with untreated plants.SA activated peroxidase and phenylalanine ammonia-lyase,as well as lignification,upon Foa attack,in a manner similar to that observed with npFo pretreatment.In addition,application of diphenylene-iodonium,an SA biosynthesis inhibitor,led to failure of npFo to induce lignin deposition and systemic resistance.Treatment of fungal spores with SA did not affect germination and growth of either npFo or Foa in in vitro antifungal assays.Production of SA at the site of npFo infection may be involved in the induction of Foa resistance in asparagus roots.
机译：先前已证明，使用选定的非致病性尖孢镰刀菌（npFo）分离物对芦笋（Asparagus officinalis）根进行预接种可通过激活植物防御机制诱导对尖孢镰刀菌（Foa）感染的系统抗性。为了阐明推定的npFo介导的防御途径，在芦笋的裂根系统中检查了水杨酸（SA）的作用，其中一半的幼苗根系被SA浸湿，随后在20℃下测量防御反应的激活。 SA处理的植物表现出增强的系统抗性，与未处理的植物相比，接种Foa的根的病害严重程度显着降低。SA会在Foa攻击时激活过氧化物酶和苯丙氨酸解氨酶以及木质化，另外，应用SA生物合成抑制剂二苯撑碘鎓导致npFo不能降解。木质素的沉积和系统抗性。在体外抗真菌试验中，SA处理真菌孢子不会影响npFo或Foa的发芽和生长。在npFo感染部位产生SA可能与诱导芦笋的Foa抗性有关根。

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