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HETEROSIS AND COMBINING ABILITY STUDIES IN THE GENOTYPES DERIVED THROUGH INTERSPECIFIC HYBRIDIZATION IN SUNFLOWER (Helianthus annuus L.)

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Title HETEROSIS AND COMBINING ABILITY STUDIES IN THE GENOTYPES DERIVED THROUGH INTERSPECIFIC HYBRIDIZATION IN SUNFLOWER (Helianthus annuus L.)
 
Creator RAJESWARI, U
 
Contributor VISHNUVARDHAN REDDY, A
 
Subject HETEROSIS, COMBINING, ABILITY, STUDIES, GENOTYPES, DERIVED, THROUGH, INTERSPECIFIC, HYBRIDIZATION, SUNFLOWER
 
Description In sunflower (Helianthus annuus L.) the present investigation was
conducted to characterize and evaluate the diverse cytoplasmic male sterile
lines and newly developed inbreds, to study the levels of heterosis, combining
ability and disease resistance capacity against Alternaria blight at Directorate
of Oilseeds Research, Rajendranagar, Hyderabad during kharif, 2003 and
rabi, 2003-04, respectively.
Ten diverse CMS lines (six sources PET-1, PET-2, ARG, CMS PF,
CMS I and GIG) and four inbreds showed much variation for characters like
leaf size, leaf angle between lower part of the petiole and stem, seed shape
and seed base colour. High heritability coupled with high genetic advance as
per cent of mean was observed for plant height, head diameter, number of
filled seeds per head, 100 seed weight and seed yield per plant indicating the
role of additive gene action in controlling these traits. Thus, breeder can
employ pedigree/SSD method to improve these traits in simple selection
process.
Four diverse CMS lines (two each with PET-1 and ARG cytoplasmic
backgrounds) were crossed with ten testers derived through interspecific
hybridization in a Line x Tester design. Significant heterosis over mid and
better parent and standard check was exhibited by majority of the hybrids.
The hybrid DCMS 42A x DRS 9 gave high per se for seed yield per plant and
also high heterosis over better parent and checks, Morden, KBSH-1 and
MSFH-17. The cross combination, DCMS 36A x DRS 11 registered negative
heterosis for days to 50 per cent flowering and days to maturity (i.e., for
earliness).
The general combining ability studies indicated that the line DCMS
36A was a good combiner for days to 50 per cent flowering and days to
maturity while, the line DCMS 42A registered high gca effects for head
diameter, number of seeds per plant, 100 seed weight and seed yield per plant.
Further, among the testers, DRS 16 and DRS 3 were found to be good general
combiners for yield and most of the yield contributing characters. The cross
DCMS 37A x DRS 12 was found to exhibit significant sca effects in
favourable direction for plant height, head diameter, number of seeds per
plant, seed yield per plant and oil content whereas, the cross DCMS 42A x
DRS 9, early maturity cross with significant positive sca effects for seed yield
per plant and oil content. The results indicated the predominance 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.
The fourteen parental lines (four CMS lines and ten testers) under field
conditions and both parents and F1s under laboratory conditions were
screened for their resistance or tolerance against Alternaria blight. It was
observed that selected lines, testers and their hybrids showed varied level of
resistance and none exhibited either immune or highly resistant reaction to
disease.
 
Date 2016-08-20T13:47:04Z
2016-08-20T13:47:04Z
2004
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/73161
 
Language en
 
Relation D7673;
 
Format application/pdf
 
Publisher ACHARYA N.G.RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD