Agriculture for Sustainable Development 2(2):1-5, 2014/Article STUDIES ON GENETIC PARAMETERS OF GLADIOLUS (GLADIOLUS HYBRIDUS H.) GENOTYPES
Forty cultivars/varieties of gladiolus were evaluated to ascertain genetic parameters of variability during the year Etawah. The analysis of variance reveals that genotypic mean squares were highly significant for all the characters studied, indicating existence of sufficient heritable variation among the genotypes. The highest and lowest phenotypic and genotypic variance were observed for spike length and weight of cormels/plant, respectively for the year 2007-08 but in case of 2008-09 and
... of 2008-09 and pooled it was found for number of cormels/plant and weight of cormels/plant, respectively. Maximum PCV and GCV were found for number of cormels per plant while days to last floret opening and days to senescence of last floret showed minimum coefficient of variation for the year 2007-08, 2008-09 and pooled. The heritability estimate of varied from 62.10% (days to 1 st floret opening) to 99.50% (rachis length), 50.90% (diameter of daughter corm) to 99.60% (no. of cormels/plant and weight of daughter corm) and 49.90% (days to 1 st floret opening) to 99.40% (no. of cormels/plant and weight of daughter corm) for the year 2007-08, 2008-09 and pooled, respectively. Genetic advance as percent of mean was recorded for weight of daughter corm, number of partially opened florets/spike, spike length, rachis length, number of shoots/corm, number of daughter corms/plant, durability of spike, plant height, diameter of daughter corm, number of corms/plant, number of leaves/shoot, number of opened florets/spike, number of florets/spike and leaf area. High heritability along with high genetic advance observed for rachis length followed by durability of spike, number of cormels/plant and weight of daughter corm. Thus, apparently contribution of additive gene effects in the expression of these traits was indicated and improvement in these characters through direct selection to select better cultivars of gladiolus can easily be done. High heritability with low genetic advance indicated the contribution of non-additive gene effects.