Division of Life Sciences, Negev Institute for Arid Zone Research, Beer-Sheva, Israel.
Plant Physiol. 1971 Jan;47(1):87-90. doi: 10.1104/pp.47.1.87.
Water stress applied to the plant shoot through enhanced evaporative demands reduced cytokinin activity in extracts of xylem exudate and leaves. This reduction resembled the changes in cytokinin activity caused by water stress applied to the root. Cytokinin activity in detached wilting leaves decreased rapidly. Recovery took place after several hours in a humid chamber. Experiments with (14)C-kinetin indicated that the mechanism of the inactivation and its reversal involve a chemical transformation of the cytokinin molecule.
通过增强蒸腾需求对植物地上部分施加水分胁迫，减少了木质部渗出液和叶片提取物中的细胞分裂素活性。这种减少类似于施加到根部的水分胁迫引起的细胞分裂素活性变化。离体萎蔫叶片中的细胞分裂素活性迅速下降。在潮湿的室内数小时后恢复。用 (14)C-细胞分裂素进行的实验表明，失活和逆转的机制涉及细胞分裂素分子的化学转化。
