Vuculic acid对空心莲子草叶片光合作用的影响  

Effect of vuculic acid produced by Nimbya alternantherae on photosynthesis of alligatorweed leaf

作　　者：王连水[1] 张云霞[1] 黄江华[1] 孙辉[1] 向梅梅[1] 

机构地区：[1]仲恺农业工程学院农学院,广州510225

出　　处：《植物病理学报》2012年第3期319-322,共4页Acta Phytopathologica Sinica

基　　金：国家自然科学基金(30671382);广东省自然科学基金项目(6022863)

摘　　要：Vulculic acid（2-乙酰基-3,4-二羟基-5-甲氧苯基-乙酸）是从空心莲子草（Alternanthera philoxe-roides）潜在生防真菌莲子草假隔链格孢（Nimbya alternantherae）培养滤液中分离获得的致病毒素。研究表明,该毒素为非寄主专化毒素,能够引致空心莲子草叶片细胞膜透性升高,导致电解质渗漏。Vuculic acid is a phytotoxin produced by Nimbya alternantherae, a potential biocontrol agent to alligatorweed （Alternanthera philoxeroides）. Effect of vuculic acid on photosynthesis of alligatorweed leaf was investigated. The results showed that after the leaves were treated with the toxin for 5 d, net photosynthetic rate, stomatal conductance and transpiration rate declined but intercellular carbon dioxide concentration in- creased significantly, and the chloroplasts swelled, chloroplast membrane digested and lamellae distorted. The effect on photosynthesis was increased with the increase of the mass concentration of the toxin. However, the toxin had no effect on chlorophyll contents. It was deduced be the direct cause of photosynthesis decrease. that the damage of chloroplast ultrastmcture might

关 键 词：叶片光合作用 空心莲子草 过氧化物酶 致病毒素 假隔链格孢 细胞膜透性 电解质渗漏 甲氧苯基 

分 类 号：S511.01[农业科学—作物学]