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《Acta Botanica Boreali-Occidentalia Sinica》 2010-10
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Effects of Plant-derived Inducers on Defensive Enzyme Activities of Melon Leaves

CHEN Nian-lai1,2,NAI Xiao-ying1,ZHANG Yu-xin2,QIAO Chang-ping1,ZHANG Jian-nong1,LI Xi-e1(1 Agronomy College,Gansu Agricultural University,Lanzhou 730070,China;2 College of Resource and Environmental Sciences,Gansu Agricultural University,Lanzhou 730070,China)  
Defensive enzyme activities in melon leaves sprayed with plant-derived inducers were investigated with cultivars 'Yindi' and 'Kalakesai'.The results showed that foliar spraying of BTH,Platycladus orientalis abstract(CB) and Chinese herb preparation(ZY) were effective in inducing melon resistance to downy mildew caused by Pseudoperonospora cubensis.After the inducer spraying and Pseudoperonospora cubensis inoculation,the activities of defensive enzymes in melon leaves significantly increased.The activities of polyphenol oxidase(PPO),phenylalanine ammonia-lyase(PAL),chitinase(CHI) and β-1,3-glucanase(GLU) in leaves of disease-resistant cultivar 'Yindi' increased more than those in the susceptible cultivar 'Kalakesai',while the peroxidase(POD) activity of 'Kalakesai' is higher than that in 'Yindi'.It can be concluded that foliar spraying of Platycladus orientalis abstract and Chinese herb preparation could induce the increase of defensive enzyme activities in melon leaves systemically,and which may be an important biochemical mechanism of increased resistance of melon plants to Pseudoperonospora cubensis.
【Fund】: 甘肃省农业生物技术研究与应用开发项目(GNSW-2006-06)
【CateGory Index】: S652
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