La glutamate déshydrogénase de la luzerne : aspects cytologiques, structuraux et évolutifs

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Abstract
The 28 isozymes of the glutamate dehydrogenase (GDH) from Medicago sativa L. pollen result from the random association of three different subunits that form a hexamer enzyme. We show in this paper that: (i) all the isozymes have a mitochondrial localization; (ii) the only mutant that we found in the species (among about 350 individuals) can also be explained by adjusting the distribution of band intensities to a multinomial distribution. The principles of this method are detailed; (iii) the zymograms obtained from other organs accord with the hexamer model of the enzyme; (iv) this mitochondrial GDH is probably homologous to all the mitochondrial GDH, whether they come from plants or animals.

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