The relation between sugar change and blood-flesh of watermelon infected with Cucumber green mottle mosaic virus

By high performance liquid chromatography(HPLC),the contents of glucose,fructose and sucrose,and the sweetness were analyzed in watermelon inoculated with Cucumber green mottle mosaic virus(CGMMV).The relationship between sugar change and blood-flesh of watermelon was determined.The results indicated that the content of glucose was apparently increased compared to that of the control before maturity(within 28 days after pollination),but reduced to 24.8% of the control after maturity(at 35 days after pollination).The content of fructose was higher than that of the control within 14 days after pollination,and then decreased with a significant difference.In all cases,the content of sucrose increased with the growth of watermelon.However,compared with the control,the sucrose content of watermelon inoculated with CGMMV was lower.The ratios of glucose,fructose and sucrose in the total sugar were abnormal.Coincidence with the changes of the total sugar,the fruit sweetness before maturity was higher than that of the control,whereas decreased sharply after maturity(lower than that of the control).The inner pulp of the mature fruit appeared to be water-soaked and dirty red with no edibility.In a word,after inoculation with CGMMV,the changes of sugars and sweetness affected the watermelon quality.