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Induction of resistance of melon cultivars with different resistances to powdery mildew after BTH treatment

CHEN Nian-lai1,2,ZHU Zhen-jia1,DAI Chun-yan2,WANG Chun-lin1,AN Cui-xiang1(1College of Agronomy,2College of Resources and Environmental Sciences,Gansu Agricultural University,Lanzhou,Gansu 730070 China)  
Induction of potential resistance in plants is a new strategy of disease control.Three melon cultivars with different basic resistance levels were employed to evaluate the effects of BTH spaying on induced resistance to powdery mildew,attempting to understand further the relationship between induced and constitutive resistance.The results showed that positive correlations existed between the induction effect and the intrinsic resistance to powdery mildew of melon cultivars.The resistant cultivars showed higher induced resistance to powdery mildew and had higher increase rate in the activity of GLU and PAL in leaf than tolerant and susceptible cultivars.The activities of GLU,PAL and PPO in leaf were higher in melon plants treated with BTH and then inoculated with Erysiphe cichoracearum than those in the plants only inoculated.Ultrastructure observation showed that papilla might be an active responsive part of melon leaf to Erysiphe cichoracearum.The papilla structure in the resistant cultivar was hemispherical,but cylinder in the tolerant and susceptible cultivars.
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