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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.)
 
Creator SREEDHAR SIDDI
 
Contributor HUSSAIN SAHIB, K
 
Subject COMBINING, ABILITY, HETEROSIS, CHARACTER, ASSOCIATION, DERIVATIVES, INTERSPECIFIC, HYBRIDIZATION, SUNFLOWER
 
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.
 
Date 2016-08-17T13:16:23Z
2016-08-17T13:16:23Z
2006
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/72734
 
Language en
 
Relation D7861;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD