Mise en évidence d'une liaison génétique entre un gène de nanisme et des marqueurs enzymatiques chez le mil pénicillaire (Pennisetum glaucum L.)

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Abstract
The genetic linkage relations between the dwarfing (D2, d2) and seven enzymic marker genes were evaluated in three crosses between semidwarf and normal inbred lines of pearl millet (Pennisetum glaucum L.). The seven genes code for the following isoenzymes: alcohol dehydrogenase (Adh A), esterase (Est A), malate dehydrogenase (Mdh D) cathodic peroxydase (Pec A), phosphoglucoisomerase (Pgi A), phospholucomutase (Pgm A), and shikimate dehydrogenase (Skdh A). Semidwarf and normal plants were identified by a discriminant analysis based on 16 morphological height components. Mendelian segregations have been observed for all eight genes. Linkage was shown between Pgi A and Pgm A (4 ± 4 centimorgans (cM)), between Skdh A and Adh A (11 ± 7 cM), between D2 and Skdh A (9 ± 5 cM) and between D2 and Adh A (17 ± 8 cM). The latter three genes are linked in the following order: Adh A – 11 cM – Skdh A – 9 cM – D2. The linkage between the recessive dwarfing gene (d2) and the codominant Skdh A alleles will help in the creation of isogenic semidwarf lines of cultivars. It is highly probable that the D2d2 genotype could be separated from the D2D2 genotype.Key words: isozymes, linkage groups, early selection.

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