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Heterosis and combining ability studies for seed yield and oil quality traits in sunflower (helianthus annuus L.)

KrishiKosh

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Title Heterosis and combining ability studies for seed yield and oil quality traits in sunflower (helianthus annuus L.)
 
Creator H.Prashanth Babu
 
Contributor H.L.Nadaf
 
Subject Genetics and Plant Breeding
 
Description A study was undertaken to assess the magnitude of heterosis and combining ability
for seed yield and component characters. The material consisted of six cytoplasmic male
sterile (CMS) and six restorer lines crossed in all possible combinations during kharif 2007.
Total of 12 parents and 36 hybrids along with four check hybrids were evaluated in
randomized block design with three replications.
Highest magnitude of average heterosis was observed for per plant yield (45.99%)
followed by seed yield (45.05%). Maximum value of standard heterosis for seed yield was
recorded by (VRF × NDOL-2) × 6-D-1P#2) (108%). Majority of the hybrids exhibited
negative heterosis for days to 50 per cent flowering and days to maturity. Among the parents,
RHA 265 and 4546A × NDOL-3 recorded higher per se performance for oleic acid, while
among hybrids (VRF × NDOL-2) × 6-D-1P#2 recorded higher heterosis for oil quality.
None of the crosses had high SCA effect for all the traits studied. The best cross
combinations for seed yield (kg/ha) (DSF-15A × R-298) and oil content (4546A × NDOL-3)
× 6-D-1P#2) with high SCA effect have been identified. RHA-851A, and CMS-234A among
the females and RHA-265 and 6-D-1P#2 among the males were identified based on gca
effect, which could be utilized further in heterosis breeding. With respect to oil quality RHA
851A and RHA 265 were found to be good combiners.
The genetic diversity of the parents was assessed based on morphological traits
and molecular diversity and their relation to the extent of heterosis was assessed. There was
no relation between genetic diversity based on morphological traits and extent of heterosis.
However, the parents with more genetic variation based on SSR polymorphism involved in
crosses produced hybrids with significant heterosis for most of the traits indicating the
importance of molecular diversity to produce heterotic hybrids.
 
Date 2016-10-24T16:28:24Z
2016-10-24T16:28:24Z
2007
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/81579
 
Format application/pdf
 
Publisher UAS, Dharwad