叶片中脱落酸增加的水势阈值。
A water potential threshold for the increase of abscisic Acid in leaves.
机构信息
Section of Ecology and Systematics, Langmuir Laboratory, Cornell University, Ithaca, New York 14850.
出版信息
Plant Physiol. 1974 Jan;53(1):125-7. doi: 10.1104/pp.53.1.125.
Abstract
A relationship between abscisic acid concentration and leaf water status is reported. Water potentials were measured in leaves of Ambrosia artemisiifolia L. and Ambrosia trifida L. throughout a period of dehydration of intact plants. Tissues from the same leaves were analyzed for abscisic acid. For both species, abscisic acid began to increase in a critical water potential range (-10 to -12 atmospheres). These data suggest a threshold water potential that stimulates abscisic acid synthesis. The data support the hypothesis that a small change in water potential could affect stomatal resistance to water loss by means of a very sensitive chemical feedback control mechanism.
摘要
据报道，脱落酸浓度与叶片水分状况之间存在关系。在完整植物脱水过程中，我们测量了豚草属植物和三裂叶豚草属植物叶片的水势。对来自同一叶片的组织进行了脱落酸分析。对于这两个物种，脱落酸在一个临界水势范围（-10 到-12 大气压）内开始增加。这些数据表明，一个刺激脱落酸合成的阈值水势。这些数据支持了这样一个假设，即水势的微小变化可以通过非常敏感的化学反馈控制机制影响气孔对水分流失的阻力。
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