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GENETIC VARIABILITY AND COMBINING ABILITY STUDIES OF NEW PLANT TYPES IN SESAME (Sesanum indicum L. )

KrishiKosh

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Title GENETIC VARIABILITY AND COMBINING ABILITY STUDIES OF NEW PLANT TYPES IN SESAME (Sesanum indicum L. )
 
Creator KANAKA DURGA, K
 
Contributor AGHUNATHAM, G
 
Subject planting, yields, developmental stages, sowing, crossing over, genetics, oilseeds, additives, livestock, cultivation
 
Description The investigations were undertaken to study
the pattern of variability for yield and yield components
with special emphasis on physiological attributes
besides the genetic information on the nature of combining
ability of some new plant types in sesame. Wider
genetic variability was observed for height to first
branch, number of secondaries, height to first capsule,
capsules on main stem and number of abortive capsules.
Higher variability and heritability coupled with higher
genetic advance was observed for height to first
branch, height to first capsule, capsules on main stem
and number of secondaries indicating the effectiveness
of selection for these characters. The genotypes DORS-
63 and DORS-111 were desirable for all the physiological
attributes like LAI, LAD, CGR, RGR and NAR, while
TC-25 for LAI and LAD. Moderate to high variability
coupled with high heritability and genetic advance were
observed for NAR. High heritability accompanied by
moderate to high variability and genetic advance was
observed for RGR.
The hybrids DORS-106 x Gauri, DORS-165 xTapi,
DORS-179 x Tapi, DORS-112 x Gauri and DORS-112 x Tapi
in addition to maximum heterosis (>30%) for seed yield,
also registered higher heterosis for atleast three
major yield attributes each indicating the cumulative
heterosis of individual yield components to the hetero sis of seed yield revealing the possibility of heterosis
breeding, whenever male sterile lines are made
available or other methods for hybrid seed production
on commercial scale at a cheaper cost. Based on the
variance components, non-additive gene action was predominant
for majority of the characters except for
nodes to first flower which is governed by additive
gene action. Improvement of these attributes is
possible through cyclic hybridization methods (recurrent
selection, diallel selection or biparental
mating). Among the lines, DORS-165 recorded significant
gca effects for seed yield and five other yield
attributes followed by DORS-112. For earliness and
dwarfness, DORS-102 was the best general combiner.
Among the testers, Tapi was considered to be good
combiner for seed yield and other yield contributing
characters like earliness, number of primaries and
secondaries. Cross combinations viz., DORS-102 x
Madhavi and DORS-112 x Tapi recorded highest sea
effects for seed yield and seven other yield contributing
characters followed by DORS-101 x Tapi, DORS-106 x
Tapi and DORS-112 x Gauri. The hybrids DORS-102 x
Madhavi, DORS-106 x Tapi,DORS-179 x Madhavi, DORS-179 x
Tapi and DORS-112 x Gauri recorded highly significant
sea effects and also heterosis for seed yield and hence
offer scope for use in future breeding programmes
 
Date 2017-01-20T10:25:40Z
2017-01-20T10:25:40Z
1992
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/97254
 
Language en
 
Relation D3940;
 
Format application/pdf
 
Publisher ANDHRA PRADESH AGRICULTURAL UNIVERSITY RAJENDRANAGAR, HYDERABAD