Acetyl coenzyme A carboxylase in species of Triticum of different ploidy |
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Authors: | J. C. Hawke R. M. Leech |
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Affiliation: | (1) Department of Biology, University of York, Y01 5DD York, UK;(2) Present address: Department of Chemistry and Biochemistry, Massey University, Palmerston North, New Zealand |
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Abstract: | The cellular amounts and cellular activities of acetyl CoA carboxylase (ACC; EC 6.4.1.2.) were determined in the first leaves of diploid, tetraploid and hexaploid species of Triticum (wheat). Per leaf the ACC activities were very similar in T. monococcum (2 ), T. dicoccum (4 ) and T. aestivum (6 ). The ACC activity per chloroplast also showed little variation between species of different ploidy but since chloroplast number increases with ploidy, the ACC activities and ACC amounts per cell also increased with ploidy. These cellular increases in ACC amounts associated with increases in gene dosage were highly co-ordinated in the diploids T. monococcum and T. tauschii and their respective autotetraploids so the specific activity of ACC was highly conserved in these plants. The relevance of these findings to attempts to genetically manipulate lipid biosynthesis in chloroplasts is discussed.Abbreviation ACC acetyl CoA carboxylaseWe are very grateful to Dr. Kevin Pyke and Miss Jo Marrison for many helpful discussions and to Dr. Collin Law for the generous gift of seeds. |
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Keywords: | Acetyl CoA carboxylase Leaf (acetyl CoA carboxylase) Gene dosage (enzyme activity) Ploidy (wheat) Triticum (acetyl CoA carboxylase) |
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