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EFFECT OF CR+6 AND CHELATING AGENTS ON GROWTH, PIGMENT STATUS, PROLINE CONTENT AND CHROMIUM BIOAVAILABILITY IN RICE SEEDLINGS

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Author(s): MOHANTY M AND PATRA HK

Journal: International Journal of Biotechnology Applications
ISSN 0975-2943

Volume: 3;
Issue: 3;
Start page: 91;
Date: 2011;
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Keywords: Chelating agents | Chromium bioaccumulation | Hexavalent chromium | Oryza sativa L.

ABSTRACT
Hexavalent Chromium (Cr+6) induced several toxicological changes in the developing rice (Oryza sativa L.)seedlings as showed from present in vitro hydroponic study. Growth parameters, physiological and biochemical alterationsin rice were studied in response to the application of toxic concentration of Cr+6 with addition of chelating agents. Riceseedlings growing in nutrient solutions supplemented with Cr+6 (100μM) showed noticeable decrease in root and shootlength, fresh and dry matter; whereas addition of chelating agents like EDTA, DTPA and EDDHA with Cr+6 at 10 μMstimulates the growth. Chlorophyll and carotenoid biosynthesis was also declined with the treatment of Cr+6 (100μM), butapplication of Cr+6-EDTA (10μM) amplified the pigment biosynthesis. Rice seedlings treated with Cr+6(100μM) showedincreased proline content and high Cr accumulation in root whereas treatments of Cr+6-DTPA (10μM) enhanced the shootCr bioaccumulation as compared to other treatments. Supplementation of Cr+6-EDTA (10μM) showed increased phytoextractionof Cr in roots of rice seedlings. Transportation index (Ti) of seedlings grown in Cr+6 (10μM) and Cr+6- DTPA(10μM) was found more in comparison to others. The variations in the total accumulation rate (TAR) of Cr of differentseedlings were negligible.

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