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Effect of arsenic on behaviour of enzymes of sugar metabolism in germinating rice seeds

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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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Correspondence to R. S. Dubey.

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Jha, A.B., Dubey, R.S. Effect of arsenic on behaviour of enzymes of sugar metabolism in germinating rice seeds. Acta Physiol Plant 27, 341–347 (2005). https://doi.org/10.1007/s11738-005-0010-x

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  • DOI: https://doi.org/10.1007/s11738-005-0010-x

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