Leakage of solutes from Brassica juncea leaves during Alternaria brassicae pathogenesis

摘要

Leakage of electrolytes and some organic metabolites from leaves was studied in B. juncea cultivars resistant (RC781) and susceptible (Varuna) to A. brassicae. Fifty-day-old plants were inoculated with a spray suspension in a pot experiment. Leaveswere cut into 2 pieces at different post-inoculation stages, shaken in deionised water and the filtrate analysed. Infection by the pathogen affected the composition of leaf leachates differently in the 2 cultivars. Electrical conductivity of leachates ofVaruna increased significantly up to 3 days after inoculation, whereas it remained unchanged in RC781. The decrease in sugars and phenolic compounds after inoculation was greater in Varuna than in RC781.