Abstract:
Yellow Vein Mosaic Virus (YVMV) disease of okra is
the single major production
constraint and causes yield loss to the tune of 50-
90% in India. Hence continuous search
for new sources of resistance and development of be
tter varieties/hybrids with durable
level of resistance should receive attention of bre
eder. An attempt was made to screen
twenty-six advanced lines/varieties of okra in one
of the hot spots of YVMV disease in
eastern India to identify suitable parents for resi
stant breeding program. The study
revealed high magnitude of genetic variability and
high degree of transmission of
majority of the growth, earliness, and yield compon
ent traits under consideration.
Based
on the degree of divergence, the genotypes were gro
uped into four clusters. Hybridization
between
genotypes belonging to Cluster II and Cluster III c
ould combine early maturity,
higher yield, and having high tolerance against YVM
V disease. Dendrogram among the
genotypes also revealed high diversity along with s
trong inter cluster relationships. Based
on averages and principal component analysis, six g
enotypes
viz
., BCO-1,
A. caillei
,
A.
manihot
, 11/RES-6, VNR Green and 12/RES-2 appeared very pr
omising candidates for
future use in resistant breeding programs.
Keywords:
Genetic diversity, PCA analysis, Resistant breeding
,
Tolerance against YVMV.
