Laboratory of Plant Hardiness, Department of Horticultural Science and Landscape Architecture, University of Minnesota, St. Paul, Minnesota 55108.
Plant Physiol. 1986 Feb;80(2):470-2. doi: 10.1104/pp.80.2.470.
Permeability coefficients (Kp) of nonelectroytes were determined at several temperatures for nonacclimated and acclimated plasma membranes of the frost sensitive Solanum tuberosum and the frost resistant Solanum commersonii. In nonacclimated membranes, Kp were equal at 25 degrees C for the two species. Kp decreased with decreased temperature in both species; however, the decrease was much greater in the frost sensitive S. tuberosum than in frost resistant S. commersonii.Kp increased with cold acclimation. After acclimation the temperature sensitivity of Kp or activation energy (Ea) for S. tuberosum was similar to that of S. commersonii; however, Kp for S. tuberosum were lower than those for S. commersonii at all temperatures.The differences in Kp and activation energy indicate plasma membrane differences between the species before acclimation. After acclimation there was still a difference between the plasma membranes of the two species as well as a difference between the nonacclimated and acclimated membranes of the same species.
非电解质的渗透率系数（Kp）在几个温度下被确定，用于未适应和适应冷冻敏感的马铃薯和抗冷冻的茄属植物的质膜。在未适应的膜中，两种物种在 25°C 时的 Kp 相等。Kp 在两种物种中都随温度降低而降低；然而，在敏感的 S. tuberosum 中，Kp 的降低幅度远大于抗冷冻的 S. commersonii。Kp 随冷驯化而增加。驯化后，Kp 的温度敏感性或 S. tuberosum 的活化能（Ea）与 S. commersonii 相似；然而，在所有温度下，S. tuberosum 的 Kp 都低于 S. commersonii。Kp 和活化能的差异表明在驯化之前，物种之间的质膜存在差异。驯化后，两种物种的质膜之间仍然存在差异，以及同一物种的未驯化和驯化膜之间也存在差异。
