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GENETIC DIVERGENCE AND CHARACTER ASSOCIATION IN SAFFLOWER (Carthamus tinctorius L.)

KrishiKosh

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Title GENETIC DIVERGENCE AND CHARACTER ASSOCIATION IN SAFFLOWER (Carthamus tinctorius L.)
 
Creator VENKATA GOPINATH, V
 
Contributor SREEDHAR, N
 
Subject GENETIC, DIVERGENCE, CHARACTER, ASSOCIATION, SAFFLOWER
 
Description A study of nature and degree of genetic variability present in the exotic
germplasm accessions is essential. Based on the variability and extent of
diversity present in the population, a breeder may be able to select desirable
parents for evolving superior varieties and heterotic recombinants. Most of
the exotic germplasm which have adopted biotic and abiotic characteristic
features remains untapped. Hence, a concerted effort is needed to tap the
beneficial genes through conventional hybridisation techniques.
The present experiment consisting of thirty six exotic germplasm
accessions and four improved check varieties were laid out in a Randomised
Block Design replicated thrice at College Farm, College of Agriculture,
Rajendranagar. The data was recorded for ten morphological characters and
quantitative characters.
Morphological characterisation was carried out by using descriptor
guidelines developed by IPGRI. Considerable amount of variability was
observed for all morphological characters except for seed shape.
A analysis of variance indicated significant differences among the
genotypes for all the characters studied indicating wide variability in the
experimental material. High estimates of phenotypic and genotypic
coefficients of variations for oil yield per plant and seed yield indicated
adequate variability for these characters among the genotypes studied while low variability estimates were observed for days to 50 per cent flowering and
oil content.
The extent of genetic divergence between genotypes in the
experimental material was assessed by Mahalanobis D2 analysis. The
clustering analysis had partitioned the 40 genotypes into seven clusters based
on their D values. The pattern of distribution of genotypes in various clusters
revealed no relationship between geographical distribution and genetic
diversity. Maximum genetic divergence was found between cluster IV and
cluster V, suggesting that the genotypes in these clusters could be fully
exploited by intermating them in a definite design to explore the wide range
of heterosis and to release good recombinant lines. Hull content had
contributed maximum towards genetic divergence while, days to 50 per cent
flowering did not contribute anything.
Correlation studies revealed significant positive association of hull
content, number of seeds in main capitulum and diameter of main capitulum
with seed yield. Days to 50 per cent flowering exhibited negative association
with seed yield which suggested that it could be considered for selection for
improvement in seed yield.
Path analysis revealed that hulling percentage and number of seeds in
main capitulum had the maximum direct effect on seed yield followed by
number of effective capitula per plant and 100 seed weight. All the ten
quantitative characters exhibited positive direct effect towards seed yield
suggesting that emphasis could be laid on them to bring about an
improvement in seed yield.
 
Date 2016-08-22T13:23:32Z
2016-08-22T13:23:32Z
2003
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/73284
 
Language en
 
Relation D6965;
 
Format application/pdf
 
Publisher ACHARYA N.G. AGRICULTURAL UNIVERSITY RAJENDRA NAGAR, HYDERABAD - 500 03 0