Effects of riboflavin and TYLCV inoculation on the activities of chitinase and β-1,3-glucanase in tomato

With tomato cultivar'1479'as materials,effects of spraying riboflavin and inoculating tomato yellow leaf curl virus(TYLCV)on the activities of chitinase and β-1,3-glucanase in tomato leaves were investigated.The results showed that the activities of chitinase and β-1,3-glucanase increased significantly in tomato leaves within 96 h after spraying 2.0 mmol·L-1 riboflavin.After inoculating TYLCV,the activities of enzymes in tomato leaves further significantly increased after inducing by the riboflavin.The activities of chitinase and β-1,3-glucanase in plants inoculated with TYLCV were higher than those of un-inoculated plants.The above results indicated that the systematically-enhanced activities of the enzymes by riboflavin were closely correlated to the induced resistance of tomato to TYLCV,which might belong to the metabolism of systemic acquired resistance.