Quantitative estimation of Chlorophyll, Starch and Total soluble sugar in Potato cultivars infected with Phytophthora infestans

The kinetics of accumulation of chlorophyll, total so luble sugar and starch, was studied in four potato cultivars, when infected with Phytophthora infestans. Maximum chlorophyll content was found in Kufri Badshah followed by Kufri Jyoti, Kufri Ashoka and Kufri Chandramukhi at 50 DAP. Chlorophyll content was gradually decreased in all the tested cultivars as the blight progressed. But total chlorophyll content in leaves of cultivars Kufri Chandramukhi and KufriAshoka was significantly decreased. Total soluble sugar and starch contents were found significantly reduced as the progress of blight took place. In case of susceptible cultivars i.e, Kufri Ashoka and Kufri Chandramukhi, the rate of depletion of total soluble sugar was significantly higher as compared to tolerant cultivars viz., Kufri Jyoti and Kufri Badshah.