不同光质对人参黑斑病菌(Alternaria panax)产生胞外降解酶活性及病害发生的影响OA

In order to explore the effects of light qualities on the pathogenicity of pathogenic fungi,Alternaria panax was used as the test material,and four light quality treatments were set:white light,yellow light,red light,and blue light.The activities of cutinase and cell wall-degrading enzymes were determined,and the differences in the extracellular degrading enzyme-producing activity of Alter-naria panax under different light qualities were analyzed.The effects of different light qualities on the occurrence of ginseng Alternaria leaf blight were evaluated by field inoculation.The results showed that under different light quality conditions,differences existed in the activities of cutinase and cell wall-degrading enzymes produced by A.panax.The cutinase activities(36.48 U/mL and 36.20 U/mL,respectively)under blue light and yellow light were significantly lower than those under red and white light,blue light exhibited the best inhibitory effect on cell wall-degrading enzymes.and its activities of pectinases[polygalacturonase(PG)and polymethylgalacturonase(PMG)]were 152.16 U/mL and 140.16 U/mL,respectively,while the activities of cellulases[exoglucanase(Cx)and β-glucosidase]were 82.11 U/mL and 76.91 U/mL,respectively.Red light treatment exhibited a significant inhibitory effect on the occurrence of ginseng Alternaria leaf blight,followed by that of blue light,and the disease was the most severe under white light treatment.