METABOLIC CHANGES ASSOCIATED WITH LITTLE LEAF DISEASE IN EGG PLANT (Solanum melongena L.)
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Date
1992
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AAU, Anand
Abstract
Two varieties of brinjal (Egg plant, Solanum nelongena L.), viz., PN-1 and Morvl 4-2 and their F1 cross were under study to investigate the metabolic changes due to little leaf disease infection in them, and to locate possible biochemical factors that may be responsible for differential susceptibility to disease aaong the varieties. Before onset of disease, laoisture, chlorophyll, anthocyanin, sugar, starch, amino acid, protein, DM, RNA, peroxidase arul PPO activity were higher in resistant variety - PN-l and F1 cross as conpared to susceptible variety Morvi 4-2; phenol and glycoalkloid content were higher in Morvi 4-2 than PN-1 and F1. At peak stage o£ the disease, there was great reduction in moisture, chlorophyll, anthocyanln, sugar, peroxidase activity and glycoalkloid concentration in the susceptible brinjal variety - Morvi 4-2, but amino acid, DNA and RNA had increased. PPO activity reduced at 3rd stage only. PN-1 showed significant increase in peroxidase activity, PPO activity and glycoalkloid content after disease infection. Unlike the susceptible variety and F. cross, were anthocyanln was sharply reduced at this stage, the pigment concentration aaintained a steady state at peak disease period in PN-1. Other constituents showed normall reduction trend. The reduction in protein content was more or less sioilar in all the varieties after disease infection. Fruits of variety PN-1 with high sugar content and low phenol and glycoalkloid content proved better than Morvt 4-2 and F1 from quality viewpoint.
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BIOCHEMISTRY, AGRICULTURE, A