GENERATION MEAN ANALYSIS FOR POD YIELD AND HORTICULTURAL TRAITS IN GARDEN PEA (Pisum sativum L.)
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Date
2016-07-14
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CSKHPKV, Palampur
Abstract
ABSTRACT
The present investigation was carried out to estimate the genic effects and to detect the presence of non-allelic interactions along with linkage among interacting genes in three intervarietal crosses namely, „Palam Sumool × Punjab-89‟, „Palam Sumool × Azad P-1‟ and „Palam Sumool × Palam Priya‟ comprising of twelve generations. These twelve generations were evaluated in randomized complete block design with three replications during summer 2014 at Kukumseri for powdery mildew disease severity and during winter 2014-15 at Palampur for various yield and yield contributing traits. Majority of the crosses exhibited non-allelic interactions for majority of the traits in the respective three crosses. Adequacy of additive-dominance model indicating the absence of non-allelic interactions was observed for days to flowering in all the three crosses, pod length in „Palam Sumool × Punjab-89‟ and „Palam Sumool × Azad P-1‟, seeds per pod in „Palam Sumool × Azad P-1‟ and „Palam Sumool × Palam Priya‟ and total soluble solids in „Palam Sumool × Azad P-1‟. Genic effects revealed the presence of additive (d) gene effect in the desirable direction in „Palam Sumool × Azad P-1‟ and „Palam Sumool × Palam Priya‟ for days to flowering, „Palam Sumool × Punjab-89‟ and „Palam Sumool × Palam Priya‟ for pod length and „Palam Sumool × Azad P-1‟ for total soluble solids. Negative additive effects for seeds per pod and pods per plant and that of positive dominance effects for shelling percentage, pods per plant and pod yield per plant in one or the other crosses directed to delay selection in the later generations. In general, duplicate type of epistasis was observed for most of the traits such as plant height and protein content in all the three crosses, seeds per pod and total soluble solids in „Palam Sumool × Punjab-89‟, pod yield per plant in „Palam Sumool × Azad P-1‟ and „Palam Sumool × Palam Priya‟, ascorbic acid and powdery mildew disease severity in „Palam Sumool × Punjab-89‟ and „Palam Sumool × Palam Priya‟ and total sugars in „Palam Sumool × Punjab-89‟ and „Palam Sumool × Azad P-1‟. The significance of chi-square indicated the inadequacy of the digenic and trigenic interaction model in certain crosses for most of the traits and suggested the presence of linkage among interacting genes or still higher order interactions at several loci. Economic heterosis was observed for pods per plant and pod yield per plant along with appreciable economic residual heterosis. The type of gene effects along with presence of non-allelic interactions for majority of the traits in three crosses suggested the adoption of population improvement methods to break undesirable linkages through recombination. The other alternative can be to defer selection in the later generations by advancing segregating populations through bulk pedigree or SSD methods with one or two inter-matings like recurrent selection. Based on pod characteristics and powdery mildew disease severity, 203 single plant progenies were isolated over the generations of three crosses along with bulk seed following SSD and bulk method to isolate transgressive segregants.
Description
103p.
Keywords
Plant pathology