Browsing by Author "Rajani, B"

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    Combining ability in bhindi
    (Department of Plant Breeding and Genetics, College of Agriculture, Tavanur, 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 combining ability analysis by the Method 1 of griffing’s (1956) approach revealed that the parent P 4 (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 additive 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 additive gene action. The numerical and graphical analysis indicated overdominance for almost all characters except leaf axil bearing the first flower and incidence of shoot and fruit borer for which complete dominance was seen and leaf number for which partial dominance was noticed. The Vr-Wr graph also indicated the presence of epistasis for weight of fruits per plant, number of seeds per fruit, fruiting phase and height of plant. There was manifestation of heterosis for all the characters studied. The hybrid P2 x P1 (NBPGR/TCR 861 x NBPGR/RCR 893) was the most outstanding for yield and yield related characters when compared to the mid parent, better parent and the standard check and it also exhibited heterosis for tolerance to shoot and fruit borer. The cross P1 x P4 (NBPGR/TCR 893 x NBPGR/TCR 864) was also heterotic for earliness in flowering. In general, the parents NBPGR/TCR 893 and NBPGR/TCR 861 either alone or together produced heterotic combinations.
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    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.
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    Combining ability in okra (Abelmoschus esculentus [L.] Moench)
    (Kerala Agricultural University, Vellanikara, 2001) Rajani, B; Manju, P; Manikantan Nair, P; Saraswathy, P
    A study was conducted to estimate the combining ability of six genetically divergent parental strains of okra by diallel analysis with respect to yield and a few related attributes. The combining ability analysis by the Method I of Griffing's (1959) approach revealed that the parent NBPGR/TCR 861 was the best general combiner for single fruit weight and length and NBPGR/TCR 864 for yellow vein mosaic resistance. Among hybrids, NBPGR/TCR 893 x NBPGR/TCR 864 exhibited outstanding sea effect for yield while NBPGR/TCR 865 x NBPGR/TCR 438 and NBPGR/TCR 893 x NBPGR/TCR 861 were notable for single fruit weight, length and girth. The hybrid NBPGR/TCR 854 x NBPGR/TCR 865 showed maximum tolerance to YVM.