Terri J A, Peet M M
Barnes Laboratory, The University of Chicago, 5630 S. Ingleside Avenue, 60637, Chicago, IL, USA.
Department of Botany, Duke University, 27706, Durham, NC, USA.
Oecologia. 1978 Jan;34(2):133-141. doi: 10.1007/BF00345162.
The responses of the kinetic properties of malate dehydrogenase to environmental temperature variability were compared for two populations of Potentilla glandulosa (Rosaceae). The two populations are native to regions of contrasting climates, with the inland population experiencing a high level of temperature variability during growth and the coastal populaton a low level of temperature variability. The substrate binding ability, as measured by apparent K of both populations was relatively insensitive to assay temperature (Q <2.0) over the range of temperatures likely to be encountered during growth. The breadth of this thermal optimum was different for the two populations with the K of the inland plants exhibiting relative temperature insensitivity over a much wider range of temperatures than the K of the coastal plants. There was no difference between the two populations in the thermal stability of MDH activity.
对两种委陵菜（蔷薇科）种群的苹果酸脱氢酶动力学特性对环境温度变化的响应进行了比较。这两个种群原产于气候截然不同的地区，内陆种群在生长期间经历高度的温度变化，而沿海种群经历的温度变化程度较低。通过表观K 测量的两个种群的底物结合能力在生长期间可能遇到的温度范围内对测定温度相对不敏感（Q <2.0）。两个种群的这种热最适宽度不同，内陆植物的K 在比沿海植物的K 更宽的温度范围内表现出相对温度不敏感性。两个种群在MDH活性的热稳定性方面没有差异。
