Abstract: In order to study on resistance mechanism of P.capsici isolates with parental and resistant to the mandipropamid, determined on physiological and biochemical indexes were done.The results indicated that in the NaCl and glucose concentrations, isolates with parental and resistant for mycelial growth capacity was less affected, and at different concentrations, all strains show no significant osmotic pressure difference.It can be drawn NaCl and glucose on capsici does not have to provide nutritional and osmotic inhibition.Although mandipropamid in low concentrations resistant strains in vivo electrolyte to leak out more, with the treated time and concentration increase, the resistant strains inclusions less leakage.At the same time strains with parental and resistant that soluble protein content and B一 1, 3-glucanase activity change, parental strains of soluble protein content and cell 13-1, 3一glucanase activity is higher than resistant strains.With the treated time increase, all strains of the soluble protein content and B-1, 3-glucanase activity tended to decrease.It can conclude that the inclusion of P.capsici is leakage through the cell membrane to ac— celerate metabolism, reduce the accumulation of mandipropamid, 80 that reach the actual target concentration was decreased. At the same time the body of the soluble protein content and B一1, 3-glucanase activity decreased.For these reasons may be resistant mechanism to mandipropamid.

Key words: Phytophthora capsici, Mandipropamid, Membrane permeability, Soluble protein content, 13-1, 3一glu- CanaSP

CLC Number: 

• S436.418