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An in vitro hydroponic study on Physiological and Biochemical responses of Indian wild Rice to varying doses of Hexavalent Chromium

Author Affiliations

  • 1Laboratory of Plant Biochemistry and Environmental Biotechnology, Post Graduate Department of Botany. Utkal University, Bhubaneswar-751004, Odisha, INDIA

Int. Res. J. Environment Sci., Volume 3, Issue (11), Pages 20-28, November,22 (2014)

Abstract

Indian wild rice (Oryza nivara) grown as a weed in most of the cultivated paddy fields is used as an experimental tool in current investigation and studied for its various physiological and biochemical alterations in response to hexavalent chromium. After exposure to varying concentrations of toxic hexavalent chromium, the two cultivars of Oryza nivara i.e. IC-283169 and IC-336684 showed significant changes in its morphobiometric and physiological parameters. The present hydroponic study exhibited deleterious effects on germination, plant height and biomass of 14 days treated seedlings. IC-336684 cultivar of wild rice showed significant reduction in root-shoot length as well as dry and fresh biomass of shoot beyond a treatment dose of 50 μM Cr+6 as compared to IC-283169 cultivar. Growth parameters, chlorophyll and carotenoid content showed 50% reduction with treatment dose of 25 μM Cr+6. More than 80% reduction in all the above parameters were observed at 100 μM Cr+6 treatments. Present preliminary study screens the tolerance and sensitivity of wild rice cultivars to toxic doses of Cr+6. The aim of this article is to give an overview of the impact of varying doses of hexavalent chromium on two cultivars of Indian wild rice and removal of these toxic contaminants from soil by potent application of weeds like Indian wild rice.

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