Baskin Carol C, Baskin Jerry M
School of Biological Sciences, University of Kentucky, 40506, Lexington, Ky.
Oecologia. 1974 Mar;17(1):11-16. doi: 10.1007/BF00345091.
In order to better understand the adaptations of Astragalus tennesseensis Gray (Leguminosae) to its summer-dry cedar glade habitat, comparisons were made of the free amino acids and amides in leaves of drought- and nondrought-treated plants. No qualitative differences were detected; 13 free amino acids and 2 amides were identified. However, water stressed plants showed a 115% increase in the total amount of amino acids and amides over nondrought stressed plants. Proline accounted for 30.1% of the increase and aspartic acid 37.1%. Water stress caused an increase in the 2 amides and in 11 of the 13 amino acids; alamine and serine decreased. Upon rewatering, the total amount of amino acids and amides quickly decreased. The ability to accumulate proline and aspartic acid may be of adaptive value to A. tennesseensis during short periods of drought.
为了更好地了解田纳西黄芪（豆科）对其夏季干旱的雪松岩生境的适应性，对干旱处理和未干旱处理植株叶片中的游离氨基酸和酰胺进行了比较。未检测到定性差异；鉴定出13种游离氨基酸和2种酰胺。然而，水分胁迫植株的氨基酸和酰胺总量比未受干旱胁迫的植株增加了115%。脯氨酸占增加量的30.1%，天冬氨酸占37.1%。水分胁迫导致2种酰胺以及13种氨基酸中的11种增加；丙氨酸和丝氨酸减少。复水后，氨基酸和酰胺的总量迅速下降。在短期干旱期间，积累脯氨酸和天冬氨酸的能力可能对田纳西黄芪具有适应性价值。
