Indian Society of Genetics & Plant Breeding


Studies on heterotic parameters in Populus deltoides

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Exploitation of genetic variability of Populus deltoides
Bartr. through control crossing involving Line x Tester
mating design was attempted with the objective of selection
of suitable clones as well as parents for hybridization in
future and identification of best families and best individuals
with in family for releasing first stage clones. Lines ST-72,
D-121, G-48, exhibited the highest positive GCA effects for
plant height, collar diameter, plant height at first branch
and root length. In general G-48 also proved to be the best
combiner for survival percentage, inter nodal length and
leaf area. Among the testers ST-63 and ST-70 expressed
highest GCA effects and excelled for a number of desirable
characters. Full sib families (F1s) of D-121 x ST-70 and G-48
x ST-63 showed desirable SCA for plant height and collar
diameter and therefore F1 hybrids of these crosses are
recommended at first stage of selections. The percent
contribution of line x tester interactions was higher than
that of lines and testers except number of leaves per plant.
13 traits expressed higher SCA variance than GCA variance
and dominant gene effect (s2D) were found higher than
additive gene effect (s2A) except in root length. For
recurrent selection based on GCA effects, parents G-48,
ST-70, D-121 and ST-63 appeared more appropriate in
crossing programme directed towards clonal improvement
of Poplar in India.

Keywords: Populus deltoides, Line x Tester, GCA, SCA, heritability, gene action


Year: 2015
Volume: 75
Issue: 3
Article DOI: 10.5958/0975-6906.2015.00065.6
Print ISSN: 0019-5200
Online ISSN: 0975-6906


Kadam Singh info_circle
Punit Choudhary info_circle

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