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首页> 外文期刊>Plant Pathology >The salicyclic acid-dependent defence pathway is effective against different pathogens in tomato and tobacco
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The salicyclic acid-dependent defence pathway is effective against different pathogens in tomato and tobacco

机译：水杨酸依赖性防御途径对番茄和烟草中的不同病原体有效

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摘要

The role of salicyclic acid (SA) was investigated in basal defence and induced resistance to powdery mildew (Oidium neolycopersici) and grey mould (Botrytis cinerea) in tomato (Lycopersicon esculentum) and tobacco (Nicotiana tabacum).A comparison of NahG transgenic tomato and tobacco (unable to accumulate SA) to their respective wild types revealed that in tomato,SA was not involved in basal defence against O.neolycopersici but NahG tobacco showed an enhanced susceptibility to O.neolycopersici infection,the effect becoming more obvious as the plants grew older.In contrast,SA played no role in the basal defence of tobacco against B.cinerea,but seemed to contribute to basal defence of tomato against B.cinerea.Activation of the SA-dependent defence pathway via benzothiadiazole (BTH) resulted in induced resistance against O.neolycopersici in tobacco but not in tomato.Microscopic analysis revealed that BTH treatment could prevent penetreation of the Oidium germ tube through tobacco leaves,whereas penetration was successful to tomato leaves irrespective of BTH treatment.In contrast,soil or leaf treatment with BTH induced resistance against B.cinerea in tomato but not in tobacco.It is concluded that the SA-dependent defence pathway is effective against different pathogens in tomato and tobacco.
机译：研究了水杨酸（SA）在番茄（Lycopersicon esculentum）和烟草（烟草）的白粉病（Oidium neolycopersici）和灰霉病（Botrytis cinerea）和烟草（Nicotiana tabacum）的基础防御和诱导的抗性中的作用。烟草（无法累积SA）至其各自的野生型表明，在番茄中，SA未参与针对O.neolycopersici的基础防御，但NahG烟草对O.neolycopersici感染的敏感性增强，随着植物的生长，这种作用变得更加明显相比之下，SA在烟草对灰质双歧杆菌的基础防御中没有作用，但似乎有助于番茄对灰质双歧杆菌的基础防御。通过苯并噻二唑（BTH）激活SA依赖性防御途径导致诱导显微分析表明，BTH处理可以阻止烟草中的Oidium胚芽管穿透烟草，但对番茄无抗O.neolycopersici的能力。因此，无论BTH处理如何，番茄叶的渗透都是成功的。相反，BTH处理土壤或叶片对番茄中的B.cinerea产生了抗药性，但在烟草中却没有。番茄和烟草。

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