ASSESSING AND ARRESTING TRANSFER OF ARSENIC FROM SOIL TO RICE PLANT

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dc.contributor.advisorSiba Prasad Datta
dc.contributor.authorARKAPRAVA ROY
dc.date.accessioned2020-02-27T09:01:16Z
dc.date.available2020-02-27T09:01:16Z
dc.date.issued2019
dc.descriptionT-10179en_US
dc.description.abstractThe problem of arsenic (As) contamination in soil, water and food materials has been increasing day by day and attracting the attention of researchers globally. The worst affected areas probably include Bengal delta basin, where at least 36 million people have been exposed to As hazard. Manifold enhancement in the level of As was also reported in soil and water with subsequent transfer of As to human food chain, mainly via drinking water and plant. Much progress has not been made so far to overcome the problem of As-pollution caused by the consumption of edibles. Hence in the present investigation entitled “Assessing and arresting transfer of arsenic from soil to rice plant”, relative As uptake ability of rice cultivars, distribution of As in different plant parts as affected by applied silicate and release of organic acids from rice roots as affected by As were assessed in pot and solution culture experiments. For this purpose, a pot experiment was conducted to assess the effect of applied silicate (@ 0, 250 and 500 mg kg-1 ) on As uptake ability of four rice cultivars viz. IR-36, Khitish, Satabdi and Badshabhog, using an As-polluted soil, collected from West Bengal. Besides, a solution culture experiment was conducted to assess the organic acids secreted by rice roots due to As application (@ 0 and 100 µg L-1 ). Results indicated that the relative ability to accumulate As in rice grain was minimum in case of Badshabhog (0.06 mg kg-1 ) as compared to Khitish (0.24 mg kg-1 ), IR-36 (0.34 mg kg1 ) and Satabdi (0.36 mg kg-1 ). More or less, a similar trend of As accumulation in the straw of different cultivars was obtained. Arsenic content in the rice husk ranged from 0.52 to 0.63 mg kg-1 and there was no significant variation across the cultivars. On an average, translocation factors of As from shoot to husk were 0.47, 0.18, 0.17 and 0.11 for Badshabhog, IR-36, Satabdi and Khitish, respectively, with the corresponding values for husk to brown rice were 0.09, 0.55, 0.71 and 0.39. Translocation factor of As from root to shoot was recorded as 0.52 for IR-36, 0.42 for Satabdi, 0.35 for Badshabhog and 0.31 for Khitish. On average, there was a significant reduction in As content in brown rice to the tune of 14.3 and 28.6% where sodium metasilicate (Na2SiO3) was added @ 250 and 500 mg kg-1 , respectively. The highest concentration of total weak acid was secreted by IR-36 (0.82 mN), followed by Khitish (0.58 mN), Satabdi (0.44 mN) and Badshabhog (0.36 mN), which, by and large, appeared to be negatively related with As content in brown rice of the respective cultivars. However, the concentration of all the organic acids (citric, malic and succinic acid) as quantified in the solution culture was not varied with rice cultivars except lactic acid, which also, in turn, did not have any definite trend in respect of As accumulation in rice cultivars. Integrated use of low As accumulating rice cultivars and silicate can be a promising and potential strategy to arrest the transfer of As from soil to the grain of rice, grown in polluted soils.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/5810143782
dc.keywordsKeyword: Arsenic, rice, silicate, organic acidsen_US
dc.language.isoen_USen_US
dc.publisherDIVISION OF SOIL SCIENCE AND AGRICULTURAL CHEMISTRY ICAR-INDIAN AGRICULTURAL RESEARCH INSTITUTE NEW DELHIen_US
dc.subSoil Science and Water Managementen_US
dc.subjectnullen_US
dc.themeASSESSING AND ARRESTING TRANSFER OF ARSENIC FROM SOIL TO RICE PLANTen_US
dc.these.typeM.Scen_US
dc.titleASSESSING AND ARRESTING TRANSFER OF ARSENIC FROM SOIL TO RICE PLANTen_US
dc.typeThesisen_US
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