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Ecogeographical distribution and thermostability of isocitrate dehydrogenase (IDH) alloenzymes in European silver fir (Abies alba)



Ecogeographical distribution and thermostability of isocitrate dehydrogenase (IDH) alloenzymes in European silver fir (Abies alba)



Biochemical Systematics and Ecology 21(5): 597-605



A latitudinal frequency cline observed for the two alleles B1 and B2 at the IDH-B enzyme locus in European silver fir suggested the existence of a correlation between the associated north-south temperature gradient and the thermostability of the two alloenzymes. 81 prevailed in the northern and B2 in the southern populations. Thermostability of an enzyme is defined by the length of time the enzyme can endure a given temperature without suffering damage (denaturation) that reduces its catalytic efficiency below a specified threshold; the threshold is specified by the visibility of activity in the zymogram. Using extracts from endosperms of homozygous trees incubated under various temperatures and followed by electrophoresis, it turned out that the B2 distinctly exceeds the B1 alloenzyme in thermostability in trees from both extremes of the fir transect. Supported by observations made in other species, it is concluded that catalytic activity and thermostability are negatively correlated for this enzyme locus. Based on this relationship, the observed IDH polymorphism is argued to be the result of adaptation to high temperature regimes.

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Accession: 002351081

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