PJB-2001-32
GENETIC DIVERSITY IN LOCAL COLLECTIONS OF VIGNA MUNGO (L.) HEPPER WITH RELATION TO GEOGRAPHIC PATTERN
ABDUL GHAFOOR , ZAHOOR AHMAD, SH. MUHAMMAD IQBAL1 AND ZAFAR RIAZ
Abstract
Eighty eight genotypes of Vigna mungo (L.) Hepper selected on the basis of source/origin were evaluated for agronomic traits and analyzed on the basis of three geographic parameters i.e., provinces, agro-ecological zones and altitude. The differences according to geographical regions proved its validity in substantiating the postulated regions of diversity or gene centres. Migration of landraces into new regions, followed by some degree of contamination by mixture or out crossing with other landraces were observed which might be due to frequent exchange of germplasm or transportation of grains from one place to others. The areas with a high level of stress will present interesting tolerance to environmental stresses, but homogeneous mixtures, and hence needs less extensive sampling for genetic resources for conservation purposes. The study confirmed the existence of a wealth of phenotypic divergence in the local blackgram germplasm. The variation within the country appears largely attributable to different provinces rather than smaller units of crop-ecological zones and altitude intervals. Further collecting missions to main blackgram growing areas with greater diversity could concentrate efforts on sampling as many geographically and ecologically distinct areas as possible rather than collecting extensively from fields close to motorable roads within individual province. The germplasm with high mean values along with medium to high genetic variance should be exploited through simple selection.
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