Pak. J. Bot., 33(3): 239-249, 2001. | Back to Contents | ||||
|
Updated: 01-12-10 | ||||
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.
Plant Genetic Resources Institute (PGRI),
National Agricultural Research Centre (NARC), Islamabad, Pakistan. |
|||||
Back to Contents |
|
Back to Contents |