Effect of arsenic on behaviour of enzymes of sugar metabolism in germinating rice seeds |
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Authors: | A?B?Jha Email author" target="_blank">R?S?DubeyEmail author |
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Institution: | (1) Department of Biochemistry, Faculty of Science, Banaras Hindu University, 221005 Varanasi, India;(2) Department of Biochemistry, Faculty of Science, Banaras Hindu University, 221005 Varanasi, India |
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Abstract: | Arsenic (As) is a potential contaminant of groundwater as well as soil in many parts of the world. The effects of increasing
concentration of As (25 μm and 50 μm As2O3) in the medium on the content of starch and sugars and activity levels of enzymes involved in starch and sugar metabolism
i.e. α-amylase, β-amylase, starch phosphorylase and acid invertase were studied in germinating seeds of two rice cvs. Malviya-36 and Pant-12 during 0–120 h period. As toxicity in situ led to a marked decline in the activities of α-amylase, β-amylase in endosperms as well as embryoaxes of germinating rice
seeds. The activity of acid invertase increased in endosperms as well as embryoaxes whereas starch phosphorylase activity
declined in endosperms but increased in embryoaxes under As treatment. In endosperms a decline in starch mobilization was
observed under As toxicity, however under similar conditions the content of total soluble sugars increased in embryoaxes.
The observed inhibition in activities of amylolytic enzymes might contribute to delayed mobilization of endospermic starch
which could affect germination of seeds in As polluted environment, while the induced acid invertase activity and increased
sugar accumulation in embryoaxes could serve as a possible component for adaptation mechanism of rice seedlings grown under
As containing medium. |
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Keywords: | acid invertase α -amylase β -amylase arsenic toxicity Oryza sativa L seeds starch phosphorylase |
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