Division of Life Sciences, Negev Institute for Arid Zone Research, Beer-Sheva, Israel.
Plant Physiol. 1971 Dec;48(6):752-5. doi: 10.1104/pp.48.6.752.
The question is raised whether the hormonal modifications in a plant exposed to osmotic root stress result directly from the decrease in water potential of the root environment or from disturbances of the plant's water balance.Tobacco plants were held for 24 hours under either high or low relative humidities, with or without salt. The amount of abscisic acid in the leaves of salinized plants rose markedly in low, but not in high, relative humidity. No change in the amount of extractable cytokinins was detected in any treatment. It is tentatively suggested that variations in the water content of leaves constitute a primary signal for modification of plant hormonal balance.
问题是，暴露于渗透根胁迫下的植物中的激素变化是否直接来自于根环境水势的降低，还是来自于植物水分平衡的干扰。将烟草植物在高或低相对湿度下保持 24 小时，有或没有盐。在低盐但不在高盐条件下，盐胁迫植物叶片中的脱落酸含量显著增加。在任何处理中均未检测到可提取细胞分裂素的量发生变化。有人推测，叶片含水量的变化构成了植物激素平衡变化的主要信号。
