METABOLIC ALTERATIONS ASSOCIATED WITH WATER STRESS IN DROUGHT TOLERANT AND DROUGHT SUSCEPTIBLE CULTIVARS OF SORGHUM (Sorghum bicolor (L.) Moench )"
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Date
1991
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Mahatma Phule Krishi Vidyapeeth, Rahuri.
Abstract
Six cultivars of rabi sorghum (Sorghum bicolor (L) Moench) were exposed to osmotic stress induced by polyethyleneglycol (PEG-6000) and their proline accumulation potential was ascertained. Based on the differential proline accumulation potential and growth response on light soil, three cultivars were exposed to water stress by withholding irrigation in a pot culture experiment. The investigations on metabolic alterations due to water stress revealed that the content of proline, free-amino acids and reducing sugars increased, whereas the iri vivo nitrate reductase activity and chlorophyll content decreased with an increase in the level of stress. High proline accumulating cultivar (Lakadi) showed least reduction in in vivo nitrate reductase activity and chlorophyll content, whereas low proline accumulating cultivar (SPV-504) recorded maximum reduction in the iri vivo nitrate reductase activity and chlorophyll content at all the stress levels. The concentration of proline increased significantly in all the three cultivars with an increase in the intensity of stress but the percentage increase over control was more in Lakadi and less in SPV-504 at all the stress levels.
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