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

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Title STUDIES ON GENETIC DIVERGENCE AND CHARACTER ASSOCIATION IN SAFFLOWER ( Carthamus tinctorius L. )
 
Creator SIRISHA, M
 
Contributor FARZANA JABEEN
 
Subject GENETIC, DIVERGENCE, CHARACTER, ASSOCIATION, SAFFLOWER
 
Description A study of the range, magnitude, nature and exploitability of genetic
variation and the extent to which the desirable characters are heritable plays an
important role in crop improvement. The estimates of variability for yield and its
heritable components in the material with which the breeder is working are
pre-requisites for any breeding programme, as it helps in selecting desirable parents
for evolving superior varieties showing genetic prepotency for yield. Hence, a
concerted effort is required to tap the beneficial genes through conventional
hybridization techniques.
In the present study, a trial consisting of sixty germplasm accessions
and four check varieties was laid in Simple Lattice design with two replications at
College Farm, College of Agriculture, Acharya N. G. Ranga Agricultural University,
Rajendranagar, Hyderabad. The data were recorded for ten morphological and 12
quantitative characters. Morphological characterization was done with IPGRI
descriptor guidelines. Considerable amount of variability was observed for all
morphological characters.
Analysis of variance revealed significant differences among the
genotypes for all the characters studied, indicating wide variability among the
experimental material. The estimates of PCV and GCV were high in case of seed
yield/plant followed by number of primary branches /plant and number of effective
capitula /plant indicating high, variability for the characters among the genotypes
while low variability estimates were noticed for days to maturity and oil content.
The extent of genetic divergence between genotypes in the
experimental material was assessed by Mahalanobis D2 analysis. The cluster
analysis partitioned the sixty four genotypes into nine clusters based on D2 values.
Maximum genetic divergence was found between cluster VI and cluster IX
followed by cluster II and cluster IX, suggesting that the genotypes in these clusters
could be exploited by intermating in a definite design to explore the wide range of
heterosis and to release good recombinant lines. Seed yield/ plant had contributed
maximum towards genetic divergence while oil content and main capitulum
diameter contributed least towards divergence.
Correlation analysis revealed that number of primary branches /plant,
main capitulum diameter, number of effective capitula/plant, number of filled seeds
in main capitulum, biological yield/plant, hull content, had positive association with
seed yield/plant. Days to 50% flowering, days to maturity, plant height, 100-seed
weight and oil content exhibited negative association with seed yield.
Path analysis revealed that biological yield/plant had highest positive
direct effect followed by 100-seed weight on seed yield/plant. Days to 50%
flowering, plant height and oil content exhibited negative direct effect on seed
yield.
 
Date 2016-07-30T10:55:02Z
2016-07-30T10:55:02Z
2009
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/70214
 
Language en
 
Relation D8533;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY RAJENDRANAGAR, HYDERABAD