Studies on the Salicylic Acid Inducted Lipid Peroxidation and Defense Gene Expression in Tobacco Cell Culture Defense Response of Grafted Watermelon Infection by Fusarium oxysporum f.sp.niveum Differential Expression of Defense Related Genes in Brassica napus Infected by Sclerotinia sclerotiorum Duration and dosage effect of chemical defense in maize (Zea mays) mediated by exogenous ethephon Induction Expression of Defense Gene in Different Varieties of Cucurbita pepo by Watermelon Mosaic Virus Infection Responses and expression of defense genes of transgenic rice with overexpressed or RNAisilenced