Population structure, genetic diversity and host specificity of the parasitic weed Striga hermonthica (Scrophulariaceae) in Sahel

Olivier A., Glaszmann Jean-Christophe, Lanaud Claire, Leroux D.. 1998. Population structure, genetic diversity and host specificity of the parasitic weed Striga hermonthica (Scrophulariaceae) in Sahel. Plant Systematics and Evolution, 209 : 33-45.

https://doi.org/10.1007/BF00991522

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Autre titre : Structure de la population, diversité génétique et spécificité de l'hôte de la mauvaise herbe parasite Striga hermonthica (Scrophulariaceae) au Sahel

Résumé : Seed proteins of individual plants from 14 populations of #Striga hermonrhica# growing on sorghum, millet, maize and wild grasses in Burkina Faso, Mali and Niger were studied using gel electrophoresis in order to assess the population structure and genetic diversity of the parasitic weed. The relative intensity of the different bands within a pattern was used to depict the genotypic constitution of each sample. Genotypic frequencies conformed to Hardy-Weinberg expectations in 13 populations out of 14 for the two loci that were interpreted. Heterozygote deficiencies could be the result of the Wahlund effect. The genetic divergence between populations appears to be low for both Adh and Got loci. Thus, the physiological specialization for a particular host could be a recent phenomenon. A low host specificity of #S. hermonthica# populations could affect the efficiency of introducing new resistant cultivars as a control measure against the parasitic weed.

Mots-clés Agrovoc : Striga hermonthica, mauvaise herbe, structure de la population, biodiversité, relation hôte parasite, méthode de lutte

Mots-clés géographiques Agrovoc : Sahel, Burkina Faso, Mali, Niger

Classification Agris : H60 - Mauvaises herbes et désherbage

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