以大丽花块茎(大丽花属)中的菊粉为介质诱导辣椒防御反应

J. C. López-Velázquez, Soledad García-Morales, J. A. Qui-Zapata, Z. García-Carvajal, D. Navarro-López, Rebeca García-Varela
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引用次数: 0

摘要

疫霉菌是辣椒枯萎病的病原菌。其控制策略之一是使用抗性诱导剂。果聚糖是一种具有有趣生物特性的分子,包括能够诱导某些植物的抗性机制。在这项工作中,我们评估了从大丽花块茎中提取的四种浓度的菊粉对受辣椒疫霉菌感染的辣椒的保护作用。研究人员选择了保护作用最强的浓度,通过β-1,3葡聚糖酶、过氧化物酶的酶活性和总酚类化合物的产生来评估防御反应的诱导作用。菊粉在浓度为 100 至 300 μM 时对感染有保护作用,症状减轻,幼苗的无性系发育得到改善。据观察,菊粉浓度为 200 μM 时,能通过秧苗的局部和系统反应,诱导出有效的防御反应,并提高了 β-1,3葡聚糖酶和过氧化物酶的活性。这种反应在用菊粉处理过的秧苗和感染了荚膜褐飞虱的秧苗之间有所区别。结论是菊粉能够通过诱导抗性来保护辣椒免受褐飞虱的侵害。
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Induction of defense response mediated by inulin from dahlia tubers (Dahlia sp.) in Capsicum annuum
Phytophthora capsici is the causal agent of chili wilt. Among the strategies for its control is the use of resistance inducers. Fructans are molecules with interesting biological properties, including the ability to induce resistance mechanisms in some plants. In this work, the protective effect of four concentrations inulin from dahlia tubers on chili infected with P. capsici was evaluated. The concentration that showed the highest protection was chosen to evaluate the induction of defense response through the enzymatic activity of β-1,3 glucanases, peroxidases and the production of total phenolic compounds. Inulin showed a protective effect against infection at concentrations of 100 to 300 μM, as symptoms decreased and seedlings showed improved vegetative development. It was observed that inulin at 200 μM concentration was able to induce an effective defense response associated with increased activity of β-1,3 glucanases and peroxidases through a local and systemic response in seedlings. This response was differentiated between seedlings treated with inulin and seedlings infected with P. capsici. It was concluded that inulin has the ability to protect chili bell pepper from P. capsici by induction of resistance.
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