Indian Society of Genetics & Plant Breeding


Genetic analysis in intra- and inter-specific crosses of tree willows

Published on

Twenty one full-sib families derived from intra- and interspecific
controlled crosses were analysed to study different
genetic parameters. Estimates of the general combining
ability (GCA) variance were found to be less than the
specific combining ability (SCA) variance for all the
parameters. The dominance variance was more than the
additive variance for all the parameters studied. The degree
of dominance ranged between 1.73 (per cent successful
crosses) and 5.35 (% germination). Moderately high (0.42
for % successful crosses) to low (0.15 for seed per capsule)
narrow sense heritibilities and high heritability in broad
sense (0.74 to 0.99) for per cent successful crosses and
seeds per catkin was recorded. GCA effects were positive
and significant for S. tetrasperma (TFB), S. tetrasperma
(TWE) and S. tetrasperma (LNM) male parents for all the
parameters while S. alba (SE- 63-007) exhibited significantly
positive effects for number of seeds/catkin. Among females,
S. tetrasperma (LP), S. tetrasperma (LNF) and S. tetrasperma
(LN) depicted positive and significant GCA effects for
number of seeds/ catkin and per cent germination,
respectively whereas crosses, S. matsudana (PN-227) x S.
alba (Kashmiri) and S. tetrasperma (LNF) x S. tetrasperma
(LNM) exhibited positive and significant SCA effects for
per cent successful crosses. Cross S. matsudana (PN-227)
x S. alba (Kashmiri) showed positive significant SCA effects
for number of seeds/ capsule.

Keywords: General combining ability, specific combining ability, dominance variance, diallel mating


Year: 2015
Volume: 75
Issue: 3
Article DOI: 10.5958/0975-6906.2015.00058.9
Print ISSN: 0019-5200
Online ISSN: 0975-6906


N. B. Singh and Archana Verma info_circle

Download PDF