Arginine catabolism in the cotyledons of developing and germinating pea seeds |
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Authors: | de Ruiter H Kollöffel C |
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Institution: | Botanical Laboratory, State University of Utrecht, Utrecht, The Netherlands. |
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Abstract: | Arginine is the predominant free amino acid in the cotyledons of developing seeds of Pisum sativum L. cv Marzia. Breakdown of arginine was measured by injecting l-guanido-14C]arginine into detached cotyledons. Cotyledons of developing seeds showed a low rate of 14CO2 evolution whereas a much higher rate of 14CO2 evolution was measured from cotyledons of seeds 4 days after the onset of germination. The activities of the catabolic enzymes arginase, urease, and ornithine aminotransferase were measured throughout development and germination. Arginase and ornithine aminotransferase were present at an early stage of development. Urease activity appeared later as the seeds started to desiccate. During germination, all three enzymes were present. The different course of activity of these enzymes indicates that they are controlled separately. |
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