Department of Botany, Duke University, Durham, North Carolina.
Plant Physiol. 1966 Sep;41(7):1222-30. doi: 10.1104/pp.41.7.1222.
The ability of Arizona Common and Coastal Bermuda grass [Cynodon dactylon (L.) Pers.] to synthesize amino acids and proteins during water stress was investigated. Amino acids were continually synthesized during the water stress treatments, but protein synthesis was inhibited and protein levels decreased.Water stress induced a 10- to 100-fold accumulation of free proline in shoots and a 2- to 6-fold accumulation of free asparagine, both of which are characteristic responses of water-stressed plants. Valine levels increased, and glutamic acid and alanine levels decreased.(14)C labeling experiments showed that free proline turns over more slowly than any other free amino acid during water stress. This proline is readily synthesized and accumulated from glutamic acid. It is suggested that during water stress free proline functions as a storage compound.No significant differences were found in the amino acid and protein metabolism of the 2 varieties of Bermuda grass.
对亚利桑那普通海滨雀稗（Cynodon dactylon（L.）Pers.）在水分胁迫下合成氨基酸和蛋白质的能力进行了研究。在水分胁迫处理过程中，氨基酸不断合成，但蛋白质合成受到抑制，蛋白质水平下降。水分胁迫导致叶片中游离脯氨酸积累 10 至 100 倍，游离天冬酰胺积累 2 至 6 倍，这两种物质都是受水分胁迫植物的典型反应。缬氨酸水平升高，谷氨酸和丙氨酸水平降低。（14）C 标记实验表明，游离脯氨酸在水分胁迫下的周转速度比其他任何游离氨基酸都快。这种脯氨酸很容易从谷氨酸合成并积累。因此，在水分胁迫下，游离脯氨酸作为一种储存化合物发挥作用。两种海滨雀稗品种在氨基酸和蛋白质代谢方面没有发现显著差异。
