GENETIC VARIABILITY OF COLOCASIA GENOTYPES OF NORTH EAST INDIA
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Date
2018
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AAU, Jorhat
Abstract
A field investigation was carried out in the Experimental Farm of Department of Horticulture, Assam Agricultural University, Jorhat-785013 during 2017-18, to study genetic variability of colocasia genotypes of North East India. The experiment was conducted in Randomized Block Design with three replications. Analysis of variance revealed that genotypes differed significantly for all the morphological and biochemical traits under study. Both genetic coefficient of variation (GCV) and phenotypic coefficient of variation (PCV) were high for weight of corm plant-1 (g), weight of cormel plant-1 (g) corm length(cm), number of cormels plant-1 , oxalate content (%) while it was moderate for petiole length(cm). A heritability (% h2) value exceeding 90 Per cent was observed for weight of corm plant -1 (g), weight of cormel plant-1 (g), number of cormels plant-1, corm length (cm), starch (%) iron (mg/100g), oxalate content (%),reducing sugar(%), ash content(%); while it was low for number of leaves plant-1. Expected genetic advance as per cent of mean (Gs %) was highest for weight of cormel plant-1 (g), while it was low for oxalate content (%). Among the biochemical traits, starch (%) showed high percentage of GCV, PCV. The value of h2 exceeding 90 per cent was observed for starch (%) and high heritability with high genetic advance were observed in weight of cormel plant -1 (g) weight of corm plant -1, petiole length(cm), and all the biochemical traits. Among the genotypes, the genotype Domor-Dima had the highest yield plant -1 (2014g ) which was followed by Ahina (1871g). Among the genotypes, the genotype Kaka-Kachu had the highest weight of corm plant-1 (g) (1463g) which was followed by Bor-Kachu (646g). Association studies at both phenotypic and genotypic levels revealed a positive or negative correlation with other morphological character. Based on the performance for growth, yield and biochemical characters, Domor-Dima followed by Ahina and Kaka-Kachu were found to be best genotypes of the Assam.