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Genetic variability and divergence in sunflower [Helianthus annuus L.]

KrishiKosh

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Title Genetic variability and divergence in sunflower [Helianthus annuus L.]
 
Creator Mamta Rani
 
Contributor Subhash Chander
 
Subject Sowing, Developmental stages, Genotypes, Planting, Yields, Genetics, Oils, Biological phenomena, Vitamins, Packaging
 
Description The present study comprised of fifty sunflower genotypes which were evaluated in randomized block
design with three replication at Research Farm, Genetics & Plant Breeding, CCS HAU, Hisar during spring, 2015.
The observations were recorded on agronomical and seed quality traits. Analysis of variance exhibited significance
of genotypes for all the characters except δ-tocopherol indicating that sufficient genetic variability was present in
the material. High estimates of heritability along with high variation (GCV and PCV) was observed for seed yield
per plant, 100-seed weight, hull content, α-tocopherol, γ-tocopherol and total tocopherol whereas high heritability
along with moderate variation was found for plant height, stem girth, head diameter, seed filling percentage, seed
volume weight, oil content and protein content. The heritability estimates were high for days to 50% flowering and
days to maturity but both GCV and PCV were low. Only duration of reproductive phase exhibited moderate
heritability with low GCV and PCV. Moderate to high level genetic advance as per cent of mean was observed for
all the traits except days to maturity. The seed yield per plant showed positive and significant correlation with
plant height, stem girth, head diameter, seed filling percentage, 100-seed weight, oil content, α-tocopherol and
total tocopherol whereas a significant but negative correlation was recorded with hull content. Path coefficient
analysis revealed that α-tocopherol, days to maturity, plant height, head diameter, γ-tocopherol, 100-seed weight,
stem girth, seed filling percentage and seed volume weight had positive and direct effects on seed yield per plant
while the characters, total tocopherol, days to flowering, hull content, protein content and oil content showed direct
negative effects. So, direct selection of genotypes for seed yield through these traits may be effective. Based on D2
values, all the genotypes were grouped into eight clusters which showed the presence of enough amount of genetic
diversity in the present material. The cluster VI was having highest numbers of genotypes followed by clusters I,
V, II, VII and VIII, III and IV. The intra-cluster distances were less than that of inter cluster distances which
showed that there was narrow genetic variation within the clusters while there was maximum genetic variation in
between the clusters. The character γ-tocopherol contributed maximum towards genetic divergence followed by
stem girth, protein content, head diameter, seed filling percentage, 100-seed weight, duration of reproductive
phase, seed volume weight, oil content, seed yield per plant and hull content. In conclusion, the present study
clearly indicate the presence of substantial variability among the genotypes which may be exploited in the
hybridization programmes for the development of inbreds lines as well as superior hybrids in sunflower.
 
Date 2017-01-27T09:27:17Z
2017-01-27T09:27:17Z
2016
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/97551
 
Language en
 
Format application/pdf
 
Publisher CCSHAU