Line x Tester analysis (fixed effect model) for yield and its components in fieldpea (Pisum sativum L.)
Loading...
Date
2021-08
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
CCSHAU,HiSAR
Abstract
Recombinant breeding is the most appropriate approach to combine various desirable
attributes in self-pollinated crops. Genetic variability parameters, combining ability and heterosis were
studied for days to flowering, maturity, primary and secondary branches per plant, nod per plant, height
of first pod, plant height, pods per plant, seeds per pod, 100-seed weight, biological and seed yield per
plant and harvest index in fieldpea (Pisum sativum L.) using line x tester design involving nine lines,
three testers and their 27 crosses. The results revealed significant differences among the parents and
hybrids for almost all the traits implying presence of adequate variability. Significant interaction
between lines and testers was for almost all the traits expressed existence of sufficient amount of
heterosis for most of the characters studied. Narrow differences between PCV and GCV of different
traits indicated lesser influence of environment on the expression of these traits. Low heritability
coupled with low genetic advance were observed for most of traits expect days to maturity, height of
first pod and plant height suggesting that these traits are genetically controlled by non-additive gene
action. The lines HFP 715 and Aman and the tester GP02/1108 and the crosses HFP 715 x GP02/1108,
Aman x GP02/1108 and Pant P-243 x HFP 1426 were observed to be the best general and specific
combiners, respectively for seed yield and its components. The σ2SCA >σ2GCA in almost all the traits
indicating control of non-additive gene effects. High manifestation of heterobeltiosis for seed yield
was evidenced by the superiority of 24 out of 27 crosses over better parent. High heterosis was
observed in the cross HFP 715 x GP02/1108 followed by IPF 14-16 x GP02/1108, IPF 14-16 x HFP
1426, DDR-23 x HFP 1426, DDR-23 x GP02/1108 and Aman x GP02/1108 for yield and its attributes.
The lines and crosses exhibited superiority in the present study can be exploited for isolating desirable
transgressive segregants in advanced generations in future fieldpea improvement programmes.