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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >RECEPTOR-MEDIATED ACTIVATION OF A PLANT CA2+-PERMEABLE ION CHANNEL INVOLVED IN PATHOGEN DEFENSE
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RECEPTOR-MEDIATED ACTIVATION OF A PLANT CA2+-PERMEABLE ION CHANNEL INVOLVED IN PATHOGEN DEFENSE

机译：受病原体防御的植物CA2 +渗透离子通道的受体介导活化

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摘要

Pathogen recognition at the plant cell surface typically results in the initiation of a multicomponent defense response. Transient influx of Ca2+ across the plasma membrane is postulated to be part of the signaling chain leading to pathogen resistance, Patch-clamp analysis of parsley protoplasts revealed a novel Ca2+-permeable, La3+- sensitive plasma membrane ion channel of large conductance (309 pS in 240 mM CaCl2), At an extracellular Ca2+ concentration of 1 mM, which is representative of the plant cell apoplast, unitary channel conductance was determined to be 80 pS, This ion channel (LEAC, for large conductance elicitor-activated ion channel) is reversibly activated upon treatment of parsley protoplasts with an oligopeptide elicitor derived from a cell wall protein of Phytophthora sojae, Structural features of the elicitor found previously to be essential for receptor binding, induction of defense-related gene expression, and phytoalexin formation are identical to those required for activation of LEAC, Thus, receptor-mediated stimulation of this channel appears to be causally involved in the signaling cascade triggering pathogen defense in parsley. [References: 41]
机译：在植物细胞表面的病原体识别通常导致多组分防御反应的启动。 Ca2 +跨质膜的瞬时流入被认为是导致病原体抗性的信号链的一部分。对欧芹原生质体的膜片钳分析显示，Ca2 +具有渗透性，对La3 +敏感的质膜离子通道具有新型的大电导率（309 pS。 240 mM CaCl2），在代表植物细胞质外体的1 mM的细胞外Ca2 +浓度下，确定的单位通道电导为80 pS，该离子通道（LEAC，用于大电导激发子激活的离子通道）是可逆的在用大豆疫霉菌的细胞壁蛋白衍生的寡肽引发剂处理欧芹原生质体后被激活，以前发现该引发剂的结构特征对于受体结合，诱导防御相关基因的表达以及植物抗毒素的形成是必需的。激活LEAC，因此，该通道的受体介导的刺激似乎与信号蛋白有因果关系g级联触发欧芹中的病原体防御。 [参考：41]

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