COMBINING ABILITY, HETEROSIS AND CHARACTER ASSOCIATION IN THE DERIVATIVES OF INTERSPECIFIC HYBRIDIZATION IN SUNFLOWER (Helianthus annuus L.)
KrishiKosh
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Title |
COMBINING ABILITY, HETEROSIS AND CHARACTER ASSOCIATION IN THE DERIVATIVES OF INTERSPECIFIC HYBRIDIZATION IN SUNFLOWER (Helianthus annuus L.)
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Creator |
SREEDHAR SIDDI
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Contributor |
HUSSAIN SAHIB, K
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Subject |
COMBINING, ABILITY, HETEROSIS, CHARACTER, ASSOCIATION, DERIVATIVES, INTERSPECIFIC, HYBRIDIZATION, SUNFLOWER
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Description |
The present investigation was conducted to study the levels of combining ability and heterosis in order to identify superior single cross and three-way cross hybrids and also to study the character association and direct and indirect effects of yield attributes on seed yield in sunflower (Helianthus annuus L.) at the Directorate of Oilseeds Research, Rajendranagar, Hyderabad during summer, 2005. Six cytoplasmic male sterile lines [three CMS lines (A) and three CMS lines (A x B1)] were crossed with ten testers in a Line x Tester design during rabi, 2005-06. The general combining ability studies indicated that the CMS line DCMS 12B was a desirable good combiner for plant height, seed filling per cent, 100-seed weight and oil content, while, DCMS 1A x 2B and DCMS 1A x 9B registered highest negative gca effects for days to 50 per cent flowering and days to maturity. The line, DCMS 2B recorded highest positive gca effects for number of filled seeds/head and total number of seeds/head, whereas, the line, DCMS 1A x 2B exhibited highest positive gca effects for seed yield/plant and head diameter. Further, among the testers, DRS 33 was found to be a very good general combiner for seed yield and important yield contributing characters. The tester, DRS 9 registered the highest positive gca effects for oil content. The three-way cross combinations, (DCMS 1A x 2B) x DRS 9, (DCMS 1A x 2B) x DRS 21 and (DCMS 4A x 12B) x DRS 28 and the single cross combinations, DCMS 5A x DRS 22, DCMS 2A x DRS 33 and DCMS 12A x DRS 8 were found to be the best specific crosses for seed yield and some of the important yield components. The single crosses, DCMS 2A x DRS 9 and DCMS 12A x DRS 33 and three-way crosses, (DCMS 1A x 9B) x DRS 27 and (DCMS 1A x 9B) x DRS 22 registered highest positive sca effects for oil content. The results indicated the preponderance of non-additive gene action for the seed yield and yield attributing traits. The magnitude of average degree of dominance revealed over dominance is the cause of heterosis for all the traits except plant height. The estimates of heterosis, heterobeltiosis and standard heterosis were found to be significant among the hybrids for different traits. The single cross combinations, DCMS 5A x DRS 33, DCMS 2A x DRS 33 and the three-way cross combinations, (DCMS 1A x 2B) x DRS 21 and (DCMS 1A x 2B) x DRS 9 recorded highest heterosis for seed yield/plant, whereas, the single cross hybrids, DCMS 2A x DRS 9 and (DCMS 12A x DRS 33) registered high heterosis for the trait oil content. Among 60 hybrids, the three-way crosses, (DCMS 1A x 2B) x DRS 35 and (DCMS 1A x 9B) x DRS 22 showed high heterosis (i.e., for earliness) for days to 50 per cent flowering and days to maturity, respectively. The present investigations revealed significant correlations among seed yield and yield components and direct and indirect effects of yield attributes on seed yield. The traits, number of filled seeds/head, head diameter, total number of seeds/head, 100-seed weight and plant height registered high positive correlations with seed yield. The highest direct effects on seed yield were observed for the traits, 100-seed weight and number of filled seeds/head. |
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Date |
2016-08-17T13:16:23Z
2016-08-17T13:16:23Z 2006 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/72734
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Language |
en
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Relation |
D7861;
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Format |
application/pdf
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Publisher |
ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD
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