DEVELOPMENT OF HYBRIDS IN Bauhinia variegata
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Date
2019-08
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UHF,NAUNI
Abstract
ABSTRACT
The present investigation entitled “Development of hybrids in Bauhinia variegata L.” was carried out
in the Department of Tree Improvement and Genetic Resources, Dr Y. S. Parmar University of Horticulture and
Forestry, Nauni, Solan (H.P.) during 2015-2017. Plant material of 5 genotypes involving parents NA-7, PI-28,
SU-11, JA-1 and DH-27 were taken from the already raised progeny trial of the species and control crosses
(hybrids) were developed using 5×5 full diallel (including reciprocals) mating design. Seedlings of control
crosses and parents were raised in the polybags in RBD with three replications. Various pod, seed and seedling
characters were evaluated through heterosis, combining ability and gene action. The analysis of variance
revealed considerable variability for different characters. Per cent successful crosses were highest (24.00%) in
NA-7×PI-28, NA-7×SU-11, SU-11×NA-7 and SU-11×PI-28 and lowest (16.00%) were in NA-7× DH-27, SU11×
JA-1, SU-11×DH-27 and DH-27×JA-1. Among parents maximum survival per cent was recorded in parents
NA-7 and DH-27 i.e. 100.00 per cent whereas minimum in SU-11 (76.67%). Among crosses PI-28×NA-7, PI28×SU-11,
DH-27×NA-7, NA-7×SU-11, DH-27×PI-28, SU-11×DH-27 and JA-1×DH-27 recorded maximum
(86.67%) survival whereas minimum (43.44%) survival was noted in DH-27×JA-1. Full diallel analysis for
combining ability revealed that NA-7 and PI-28 were found good general combiners for most of the characters.
On the basis of mean performance, heterosis over better parent and significant desirable SCA effects for
morphological characters the cross combinations NA-7×PI-28 (direct cross) and PI-28×NA-7 (reciprocal cross)
were found to be the most promising. The pod length, pod width and number of seeds per pod showed the
predominance of additive gene action in controlling the expression of these characters. Both the GCA and SCA
variances were highly significant for seed weight per pod, seed width and seed length indicating the existence of
variability due to both additive and non-additive (dominant or epistatic) gene(s) effects. The GCA: SCA (ơ2g/
ơ2s) ratio indicated the importance of additive gene action over non-additive gene action governing these
characters. Seedling height and collar diameter revealed the predominant role of additive gene action in
governing these characters. Both GCA and SCA variances were significant for number of leaves per plant,
petiole length, leaf area, number of branches per plant and internodal length indicating the existence of
variability due to both additive and non-additive (dominance and/or epistasis) gene(s) effects. The estimates of
GCA: SCA (ơ2g/ ơ2s) ratio indicated the importance of non-additive gene action over additive genetic gene
action governing these characters. Significantly high reciprocal variance was found in number of leaves per
plant. Out of 19 RAPD primers three were successful in confirming hybridity.
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