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Author: Ram Avtar × Start date: 2006 × Type: Thesis × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Studies on genetic variability and phenotypic stability in pea (Pisum sativum L.)
    (CCSHAU, 2006) Ram Avtar; Yadav, Ram Kumar
    The present study was undertaken to assess the differential response of 48 diverse genotypes of peas (Pisum sativum L.) over different environments and to estimate the genetic variability. The experiments were conducted at three locations viz., Hisar, Bawal and Kaul for two years 2003-04 and 2004-05. Observations were recorded for ten traits. The joint regression analysis indicated that bulk of genotype x environment (g x e) interaction was a linear function of the environmental means, although both linear and non linear function played an important role in building up of total genotype x environment (g x e) interaction. However, relative magnitude of both these portions i.e. liner and non- liner varied with the characters. In the present studies the linear portion of genotype x environment interaction was significant for the characters days to 50% flowering, Days to maturity, Primary branches per plant, plant height, number of pods per plant, length of pod, seeds per pod, 100 seed weight, yield per plant and yield per hectare. Based on the environment index, environment E1 was observed to be the most favorable environment for yield and most of its contributing traits. The genotypes included in the present study did not exhibit uniform stability and responsiveness pattern of different traits. None of the genotypes was found suitable with respect to all the traits. Considering the seed yield and its contributing trait; HFP-9907B was observed to be promisinged stable for six traitsand DMR51 was observed to be promisinged stable for five traits. The other promisinged genotypes namely Jayanti, IFPD-3-6, HFP-9907A, HFP-2008, and KMPR 706 were observed to be stable and average responsive for four traits, as indicated by their high mean performance, average to above average response and non significant values. Characters like length of pod, days to 50% flowering and days to maturity had relatively low genetic variability as well as genetic advance. Length of pod, yield per plant and yield per hectare showed low to medium heritability. The important attributing characters for yield such as days to 50% flowering, days to maturity, pods per plant and primary branches per plant had high heritability. Breeding through selection for these traits for improving seed yield may prove fruitful. Implications of these results have been discussed in the present study.