1. KAUTIR (Kerala Agricultural University Theses Information and Retrieval)

Permanent URI for this communityhttp://localhost:4000/handle/123456789/1

Browse

Filters

1991 - 19952

Settings

Subject: search.filters.subject.Combining ability

Search Results

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Combining ability in bhindi (Abelmoschus esculentus (L) Moench)
    (Department of Plant Breeding and Genetics, College of Agriculture, Vellayani, 1995) Rajani, B; Manju, P
    The study was carried out in the Department of Plant Breeding and Genetics, College of Agriculture , Vellayani during 1994-95 to estimate the combining ability of six genetically divergent parental strains of bhindi and their 30 F1 hybrids obtained by crossing the six parents in a diallel pattern. The magnitude of heterosis and nature of gene action governing the yield of fruits and other important yield attributes was also elicited through Hayman's numerical and graphical approach. The combinig ability analysis by the Method 1 of Griffing's (1956) approach revealed that the parent P4 (NBPGR/TCR 864) was the best general combiner for yield and a few yield related characters. Among the hybrids P1 X P4 (NBPGR/TCR 893 x NBPGR/TCR 864) exhibited outstanding s.c.a effects for yield. Non addictive gene action was found to govern days to first flowering number of flowers per plant, length of fruit, girth of fruit, weight of single fruit, weight of fruits per plant and number of seeds per fruit while the remaining characters were governed by addictive gene action.
  • No Thumbnail Available
    Item
    Heterosis in snakegourd (Trichosanthes anguina L.)
    (Department of Olericulture, College of Horticulture, Vellanikkara, 1991) Philip Varghese; Rajan, S
    The present investigation "Heterosis in snakegourd" was conducted at the College of Horticulture during 1988-1990. Assessment of genetic variability showed significant differences of 25 characters in 48 snakegourd genotypes. The highest phenotypic coefficient of variation was observed for fruiting nodes on main vine, male flowers/plant, sex ratio and fruits/plant. The pcv was lowest for total crop duration. The gcv resulting in high heritability was high for majority of the characters. High heritability coupled with high genetic gain was noticed for male flowers/plant, sex ratio and fruiting nodes on main vine. The 48 genotypes were grouped into 10 clusters. The combing ability analysis revealed significant gca variances for all characters. The sca variances were also significant for all characters. The sca variances were also significant for all characters except for total crop duration, sex ratio and fruits/plant.