Enzymes of starch metabolism in developing grains of high lysine barley mutant |
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Authors: | Vijay I.P. Batra Shanti L. Mehta |
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Affiliation: | Nuclear Research Laboratory and Division of Biochemistry, Indian Agricultural Research Institute, New Delhi 110012, India |
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Abstract: | The absolute activities of ADPG(UDPG)-pyrophosphorylase, starch phosphorylase, ADPG(UDPG)-starch synthetase, NDP-kinase and inorganic pyrophosphatase have been studied in high lysine mutant barley Notch-2 and its parent NP 113 grains during development. In general, mutant Notch-2 grains had higher average activities of UDPG-pyrophosphorylase and starch phosphorylase and lower activity of ADPG(UDPG)-starch synthetase per grain than the parent NP 113 during grain development. Activities of NDP-kinase, ADPG-pyrophosphorylase and inorganic pyrophosphatase differed only to a small extent between the mutant Notch-2 and NP 113. It is suggested that the lower activity of ADPG(UDPG)-starch synthetase might be responsible for the reduced accumulation of starch in the mutant Notch-2 grain as compared with parent NP 113 during development. |
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Keywords: | Gramineae barley Notch-2 NP 113 ADPG(UDPG)-pyrophosphorylase starch phosphorylase ADPP(UDPG)-starch synthetase NDP kinase inorganic pyrophosphatase grain development. |
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