Carnegie Institution of Washington, Department of Plant Biology, 290 Panama Street, Stanford, California 94305.
Plant Physiol. 1978 May;61(5):858-60. doi: 10.1104/pp.61.5.858.
The effect of temperature upon ion uptake and respiration was investigated with excised roots of corn (Zea mays) and barley (Hordeum vulgare). A strong inhibition (Q(10) = 5 to 8) of ion uptake was observed at temperatures below 10 C. At higher temperatures more normal temperature dependencies (Q(10) = 1.3 to 2) were obtained. When the data were plotted according to the Arrhenius relationship, two different activation energies were indicated above and below 10 C. Other studies have related such changes with temperature in activation energy of processes to changes in membrane properties induced by temperature. These results suggest that such phase transitions may affect ion uptake processes. If so, then differences among species in their capacity to maintain normal root function at low soil temperature and to resist low temperature stress may be related to differences in the physical properties of cellular membranes.
用玉米（Zea mays）和大麦（Hordeum vulgare）的离体根研究了温度对离子吸收和呼吸的影响。在 10°C 以下，观察到离子吸收强烈抑制（Q(10) = 5 至 8）。在较高的温度下，获得了更正常的温度依赖性（Q(10) = 1.3 至 2）。当根据阿累尼乌斯关系绘制数据时，在 10°C 以上和以下指示了两个不同的活化能。其他研究将这种变化与温度对膜性质变化的影响过程中的活化能联系起来。这些结果表明，这种相变可能会影响离子吸收过程。如果是这样，那么物种在低温土壤条件下维持正常根系功能的能力以及对低温胁迫的抵抗力的差异可能与细胞膜物理性质的差异有关。
