STUDIES ON SELENIUM TOXICITY TOLERANCE AND OXIDATIVE RESPONSES IN WHEAT CULTIVARS

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dc.contributor.authorGupta, Rahul
dc.date.accessioned2017-01-13T12:04:33Z
dc.date.available2017-01-13T12:04:33Z
dc.date.issued2013
dc.description.abstractStudies on effect of selenium on its accumulation, biochemical composition and oxidative responses in three wheat cultivars viz PDW 291, PBW 550 and TL 2908 during different stages of crop development have been carried out. Plants were grown on soil treated with solutions of sodium selenate @ 2 and 4 mg kg-1 soil and leaves were subjected to biochemical analysis at 55 and 85 days after sowing and grains at maturity. Selenate treated plants accumulated higher selenium in roots, stems, leaves and grains as compared to control plants. Total dry matter yield per pot of selenate treated plants decreased significantly as compared to their respective controls. Selenate treated plants showed growth retardation, snow white chlorosis with pink colouration on the lower side of leaves, decreased shoot length, reduced leaf area and produced less number of grains as compared to control plants. Maximum reduction in these parameters was observed in selenium treated TL 2908 plants and most of the plants died before maturity with almost no grain formation with higher dose (4 mg Se kg-1 soil). Significant increase in hydrogen peroxide, ascorbic acid and lipid peroxidation and decrease in chlorophyll content were observed in selenium treated leaves in these cultivars. However, activities of antioxidant enzymes such as catalase, peroxidase and superoxide dismutase showed varied response to selenium application. Selenium accumulation resulted in decreased total reducing sugars, starch and protein content in grains whereas total free amino acids increased significantly in all the three cultivars. Selenium accumulation in wheat showed metabolic disturbances and its accumulation in wheat grains was beyond toxic levels thus making it unfit for consumptionen_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/96266
dc.language.isoenen_US
dc.publisherPunjab Agricultural Universityen_US
dc.research.problemSTUDIES ON SELENIUM TOXICITY TOLERANCE AND OXIDATIVE RESPONSES IN WHEAT CULTIVARSen_US
dc.subBiochemistry
dc.subjectplantingen_US
dc.subjectwheatsen_US
dc.these.typeM.Sc
dc.titleSTUDIES ON SELENIUM TOXICITY TOLERANCE AND OXIDATIVE RESPONSES IN WHEAT CULTIVARSen_US
dc.typeThesisen_US
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