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首页> 外文期刊>Journal of Experimental Botany >Caterpillar saliva interferes with induced Arabidopsis thaliana defence responses via the systemic acquired resistance pathway
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Caterpillar saliva interferes with induced Arabidopsis thaliana defence responses via the systemic acquired resistance pathway

机译：毛毛虫唾液通过系统获得性抗性途径干扰诱导的拟南芥防御反应

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摘要

Arabidopsis thaliana (L.) Heynh. genotypes limited in their ability to mount either octadecanoid-dependent induced resistance (IR–) or systemic acquired resistance (SAR–) were used to characterize the roles of these pathways in plant–herbivore interactions. Molecular and biochemical markers of IR were analysed in plants subject to herbivory by caterpillars of the beet armyworm, Spodoptera exigua Hübner, which had either intact or impaired salivary secretions since salivary enzymes, such as glucose oxidase, have been implicated in the ability of caterpillars to circumvent induced plant defences. Transcript expression of genes encoding laccase-like multicopper oxidase [AtLMCO4 (polyphenol oxidase)] and defensin (AtPDF1.2) showed salivary-specific patterns which were disrupted in the SAR– mutant plants. The activity of octadecanoid-associated anti-nutritive proteins, such as LMCO and trypsin inhibitor, showed similar patterns. Gene and protein changes parallel plant hormone levels where elevated jasmonic acid was observed in wild-type plants fed upon by caterpillars with impaired salivary secretions compared with plants subject to herbivory by normal caterpillars. This salivary-specific difference in jasmonic acid levels was alleviated in SAR– mutants. These results support the model that caterpillar saliva interferes with jasmonate-dependent plant defences by activating the SAR pathway.
机译：拟南芥（L.）Heynh。基因型限制了十八烷类依赖性诱导抗性（IR – ）或系统获得性抗性（SAR – ）的能力，用于表征这些途径在植物中的作用–草食动物的互动。甜菜夜蛾的食虫幼虫对草食性植物的IR分子和生化标记进行了分析，因为唾液酶（例如葡萄糖氧化酶）与食虫的能力有关，所以其唾液分泌完整或受损。规避诱导的植物防御。编码漆酶样多铜氧化酶[AtLMCO4（多酚氧化酶）]和防御素（AtPDF1.2）的基因的转录表达表明唾液特异性模式在SAR – 突变植物中被破坏。与十八烷类相关的抗营养蛋白（如LMCO和胰蛋白酶抑制剂）的活性显示出相似的模式。基因和蛋白质的变化平行于植物激素水平，在唾液分泌受损的毛毛虫喂养的野生型植物中，与正常毛毛虫吃草的植物相比，茉莉酸水平升高。在SAR – 突变体中，茉莉酸水平的唾液特异性差异有所缓解。这些结果支持了毛毛虫唾液通过激活SAR途径干扰茉莉酸酯依赖性植物防御的模型。

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