infestans infection reduced chlorophyll (Chl) pigments contents, chlorophyll fluorescence, carotenoid (Car) and anthocyanin contents and increased the accumulation of H 2O 2 and MDA. The leaves were sampled at 0, 24, 48, 72 and 96 h after the infection for evaluations. The potato leaves were artificially infected by the LC06-44 pathogen isolate. Potato leaves were sprayed five times with KPhi (0.5%) during the growing season prior to inoculation with P. In the present study, the effects of potassium phosphite (KPhi) applications on photosynthetic parameters, enzymatic and non-enzymatic antioxidant properties, hydrogen peroxide (H 2O 2) and malondialdehyde (MDA), total protein and total carbohydrate of potato leaves challenged with P. Potato late blight ( Phytophtora infestans) is among the most severely damaging diseases of potato ( Solanum tuberusom L.) worldwide, causing serious damages in potato leaves and tubers.
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