Adaptation of malate dehydrogenase to environmental temperature variability in two populations of Potentilla glandulosa Lindl.

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Abstract
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 m of both populations was relatively insensitive to assay temperature (Q 10K m of the inland plants exhibiting relative temperature insensitivity over a much wider range of temperatures than the K m of the coastal plants. There was no difference between the two populations in the thermal stability of MDH activity.