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Subject: Genetics and Plant Breeding × Author: Asish, K Binodh × Author: KAU × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Genetic variability and character associations in Anthurium andreanum Linden
    (Department of Plant Breeding and Genetics, College of Agriculture, Vellayani, 2002) Asish, K Binodh; KAU; Mayadevi, P
    Genetic variability studies was conducted on fifty different genotypes of Anthurium andreanum Linden, generated from a previous hybridisation programme in the Department of Plant Breeding and Genetics, College of Agriculture, Vellayani. The analysis of variance revealed significant variation among the fifty genotypes for all the seventeen quantitative characters studied. This reveals the high genetic potential for the improvement of this crop. Variability studies indicated that high phenotypic and genotypic coefficients of variation for the characters of total anthocyanin content, pollen fertility, inclination of candle to spathe and duration of interphase. Except for leaf area and number of flowers per candle, all the other characters were highly influenced by genotypic variation. High heritability with a good genetic advance was found for all characters except for suckering ability and number of spadices/plant/year which exhibited medium heritability and high genetic advance. These results indicated that selection of plants which were phenotypically superior with respect to fifteen of the characters studied will certainly result in a significant improvement in the next generations. Plant height was found to have significant positive phenotypic correlation with internode length, leaf area and days from emergence to maturity of inflorescence. Candle length showed significant positive correlation with leaf area, number of flowers per candle, life of spadix and duration of female phase. Genotypic correlations were higher and for most of the characters it showed high positive correlations. Most of the estimates of the environmental correlation coefficients for the characters are low and insignificant indicating the least effect of environment in the expression of the characters studied. Pollen fertility ranged from 7.03 per cent in PR X FR(2) to 50.80 per cent in U X MW. The protogynous nature of the flower and low pollen fertility suggests the hybrid nature of the crop. During the months from March to July, the pollen emergence pattern was less where the maximum and minimum temperatures were relatively high. Path coefficient analysis revealed that the characters leaf area and duration of female phase are more associated with number of flowers per candle and 40 per cent variation in flower production was attributed by the environment. High selection index values were recorded by the genotype LR X DT followed by FR X MW(l), PR X LR (3), MW X FRO). If parents are selected based on selection index values, 45 per cent genetic gain can be expected in the next generation.