Saunier R E, Hull H M, Ehrenreich J H
Department of Watershed Management, University of Arizona, Tucson, Arizona 85721.
Plant Physiol. 1968 Mar;43(3):401-4. doi: 10.1104/pp.43.3.401.
In order to understand better the physiological adaption of creosotebush (Larrea divaricata Cav.) to drought conditions, its carbohydrate and nitrogen metabolism after a 7-day desiccation period under controlled conditions were studied. Although fructose was not significantly altered in the leaves of desiccated plants, as compared to those maintained under normal moisture conditions, both glucose and sucrose were significantly reduced. Total amino acids more than doubled under moisture stress, the increase being predominantly due to proline, phenylalanine, and glutamic acid. Significant increases also occurred in alanine, arginine, histidine, isoleucine, and valine. Increases or decreases in other amino acids were not significant. These stress-induced changes in certain amino acids are considered in relationship to protein hydrolysis, to accumulation of nitrogen degradation products translocated from the roots, and to the possible function of specific amino acids (e.g., proline) in NH(3) (+) storage.
为了更好地理解 Larrea divaricata Cav.（一种杂酚油灌木）对干旱条件的生理适应，我们研究了在可控条件下经过7天干燥期后其碳水化合物和氮代谢情况。与保持在正常水分条件下的植株相比，虽然干燥植株叶片中的果糖没有显著变化，但葡萄糖和蔗糖都显著减少。在水分胁迫下，总氨基酸含量增加了一倍多，这种增加主要归因于脯氨酸、苯丙氨酸和谷氨酸。丙氨酸、精氨酸、组氨酸、异亮氨酸和缬氨酸也显著增加。其他氨基酸的增加或减少不显著。这些由胁迫引起的特定氨基酸变化与蛋白质水解、从根部转运来的氮降解产物的积累以及特定氨基酸（如脯氨酸）在NH(3)(+)储存中的可能作用有关。
