Livne A, Graziani Y
Division of Life Sciences, Negev Institute for Arid Zone Research, Beer-Sheva, Israel.
Plant Physiol. 1972 Feb;49(2):124-6. doi: 10.1104/pp.49.2.124.
Partly dehydrated tobacco leaf tissue (Nicotiana rustica), stripped of the lower epidermis, was used to study the effect of kinetin on the rate of rehydration. Depending on the rate of rehydration in untreated tissue, kinetin either increased or decreased rehydration rates. The response to kinetin was very rapid and could be discerned in less than 2 minutes. On extensive dehydration, the tissue lost the capacity to respond to kinetin. Salinity stress, which decreases the endogenous level of cytokinins in the plant, conditions the leaf to stimulation of rehydration by kinetin.It is suggested that cytokinins may play a role in controlling water permeability of the leaf tissue.
去除下表皮的部分脱水烟草叶组织（黄花烟草）被用于研究激动素对再水化速率的影响。根据未处理组织中的再水化速率，激动素要么提高要么降低再水化速率。对激动素的反应非常迅速，不到2分钟就能看出。在长时间脱水后，组织失去了对激动素作出反应的能力。盐分胁迫会降低植物体内细胞分裂素的内源水平，使叶片对激动素刺激再水化产生适应。有人提出，细胞分裂素可能在控制叶组织的水渗透性方面发挥作用。
