Abstract:

To investigate the potentia1 effect of riboflavin on the growth of cotton Fusarium wilt for looking for optimal concentration. By means of PDA medium consisting of 9 riboflavin concentration gradients, the result is that radial growth and sporogensis of cotton Fusarium wilt was affected. In the test, PDA 2% sterile NaOH solution was designed as controls. The results showed when the riboflavin concentration was higher than 0.5 mg/mL, riboflavin can inhibit the growth of mycelia, and the inhibiting activity of riboflavin was increased when its concentration increased. When the riboflavin concentration is more than 1 mg/mL, the riboflavin treatment could induce the primary hyphae swelling, branch and thallus separation increasing and somatic cell defects and other morphological changes. When the riboflavin concentration was higher than 1 mg/ml, the microsporogenesis emerge deformity. Riboflavin was effective in inhibiting radial growth and sporogensis of cotton Fusarium wilt.