Green light induces Solanum lycopersicum JA synthesis and inhibits Botrytis cinerea infection cushion formation to resist grey mould disease.

Light signals are prevalent and influence the survival strategies of both plants and the pathogenic fungi that infect them. In this study, we found that green light inhibits the infectivity of Botrytis cinerea on Solanum lycopersicum. Through transcriptome analysis and validation of S. lycopersicum leaves infected with B. cinerea, we discovered that green light enhances the synthesis of jasmonic acid and its related metabolites by upregulating the expression of OPR3 and JAR1 in S. lycopersicum. Additionally, green light boosts the activity of antioxidant enzymes like peroxidase, catalase, and ascorbic acid peroxidase in S. lycopersicum to combat tomato grey mould. Conversely, green light inhibits the expression of plant-induced colonization onset genes, mitogen-activated protein kinase genes, and the formation of infection cushions in B. cinerea. Our findings provide insights into the role of environmental green light signals in the interaction system between plants and phytopathogenic fungi.