ISSN 10227954, Russian Journal of Genetics, 2011, Vol. 47, No. 1, pp. 19–25. © Pleiades Publishing, Inc., 2011.
Pisum sativum L.
is a multipurpose cash crop and
is an integral component of various cropping systems
of the world. It provides an important protein rich
source to billions of people, and is used in rotation
with cereals and oil seeds. It is mostly cultivated as
winter legume crop in Western Europe, North Amer
ica, India, Australia, Pakistan and South America and
also in many countries of tropics and subtropics
including Burma, India, Ethiopia, Morocco, Colum
bia, Ecuador and Pern. Pea is among the four impor
tant cultivated legumes next to soybeans, groundnut
and beans .
In Pakistan it is cultivated under a wide range of
agroecological zones. It is cultivated during winter in
plains of Pakistan and during summer in highlands .
During 1999–2000, the crop was grown over an area of
135600 ha with 81900 tones production of dry peas
, but the average/hectare yield is very low as com
pared with its potential and yield obtained in many
other countries. In Pakistan, it is used as fresh green
seeds or tender green pods. Little attention has been
The article is published in the original.
given to varietals improvement of peas outside the
temperate regions of developed countries.
Breeding work in field crops is based on the utiliza
tion of germplasm either exotic or local, as germplasm
is the building blocks for crop improvement .
 presented the results of many years' study of yield
components in a collection of varieties.  made com
parison tests between dry grain pea lines and three
commercial varieties for yield and some other traits
and best ones were selected.  studied genetic vari
ability of 16 quantitative characters in 81 genotypes of
pigeon pea.  evaluated seventythree pea cultivars
belonging to different ecogeographical regions of
India for genetic variability with respect to 13 quanti
tative and 2 qualitative traits. Highly significant differ
ences in seed yield, 100seed weight, pod size and
plant height have been reported by  in pigeon pea.
Keeping in view the importance or crop and germ
plasm, present study was conducted to estimate the
genetic variation in available pea germplasm for eco
nomically important traits to select elite genotypes for
further utilization by the breeders.
It has been widely recognized that loss of genetic
diversity is a major threat for the maintenance and
Phenotypic Variation in the Agronomic and Morphological Traits
L. Germplasm Obtained from Different
Parts of the World
, A. Ghafoor
, and M. R. Khan
Department of Botany, University of Malakand, Chakdara, Dir (Lower), KhyberPaKhtunKhwa, Pakistan
Plant Genetic Resources Program (PGRP), National Agricultural Research Centre (NARC),
Park Road, Islamabad, Pakistan
Department of Biochemistry, QuaidiAzam University Islamabad, Pakistan
Received September 3, 2009
—A total of 286 genotypes were collected from 39 countries of the world and were evaluated to deter
mine the phenotypic diversity for 17 quantitative traits. Higher degree of coefficient of variation were
recorded for grain yield
(45.73%), fresh pod width
(47.24%), dry pod weight
(40.33%), plant height
(35.25%), harvest index (32.70%) and number of branches
. ClusterII clearly
reflected that late genotypes were having lightest pods weight, shortest pod width, and pod length; low grain
yield, biomass and harvest index. Width, and pod length; low grain yield, biomass and harvest index. While
genotypes in ClusterIII were in contrast to ClusterII having heaviest pods weight, longest pods width and
length, highest grain yield, biomass and harvest index. Higher PC
values have been determined for days to
flower initiation which consequently were contributing weighed positive to days to pods picking, days to
flower completion, days to dry pod appearance, days to plant harvesting while negatively contributed to yield
producing traits, indicating that late flowering pea germplasm emphasizes more on the vegetative growth and
was low yielding. However, higher PC
values have been obtained for number of branches
, grain yield and
biomass while lower values for days to flowering, days to pods picking, days to flower completion, days to dry
pod appearance and days to plant harvesting confirming the fact that early genotypes were high yielding.