Sclerotinia sclerotiorum (Lib.) de Bary is a necrotrophic fungal pathogen which causes disease in a wide range of plants. An observed decrease in photosynthetic performance is the primary reason for the reduction of crop yield induced by S. sclerotiorum. | Mechanisms by which the infection of Sclerotinia sclerotiorum Lib. de Bary affects the photosynthetic performance in tobacco leaves