Assessment of Genetic Diversity in TARO [Colocasia esculenta(L.) Schott]
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Date
2012-12-31
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College of Horticulture and Forestry, Central Agricultural University, Pasighat
Abstract
The present investigation consisting of 40 diverse genotypes of Colocasia collected from various part of country was carried out during 2011-12 at vegetable Farm, Department of Vegetable Science, College of Horticulture and Forestry, Central Agricultural University, Pasighat, Arunachal Pradesh. The experiment was laid out in Randomized Complete Block design with three replications in a plot size of 2.40 m x 2.25 m. the recommended spacing (60 cm x 40 cm) and package of practices were adapted uniformity to all the genotypes observations were recorded on five randomly tagged plants in each genotype on days to 50% emergence, pseudostem height (cm), number of days to maturity, number of corns per plant, weight of corn per plant (g), average weight of corn (g), number of cornels per plant, weight of cornel per plant (g) , average weight of cornel (g), dry matter content (%), starch content (%), total tuber yield per plant (g). The data collected over the genotypes and replications were analysed statistically for genotypic variance (02g). Phenotypic variance (O2p) phenotypic coefficient of variation (PCV), genotypic coefficient of variation (GCV), heritability (broad sense). Genetic advance as percent of mean (GA), correlation coefficient, path coefficient and generic divergence.
Analysis of variance revealed significant differences among the genotypes for all the characters. High phenotypic and genotypic coefficient of variation, heritability (broad sense), genetic advance as percentages of mean were observed for the characters like weight of corn per plant averages weight of cornel, averages weight of corn, tuber yield per plant starch content, number of cornels per plant and weight of cornel per plant correlation studies revealed that tuber yield per plant had positive and significant correlation with number of leaves per plant, pseudostem girth, weight of corn per plant, psedudostem height, averages weight of corn, number of corns per plant number of suckers per plan, weight of cornel per plant, number of cornels per plant and number of days t maturity both at genotypic and phenotypic level suggested that selection based on these traits would ultimately improve the tuber yield per plant path coefficient analysis revealed that weight of corn per plant had maximum positive direct effect on tuber yield per plant followed by weight of cornel per plant at genotypic and phenotypic level.
Mahalanobis D2 statistic indicated considerable diversity and all the 40 genotypes were grouped into seven clusters. The cluster I was the largest with20 genotypes followed by cluster III with 8 genotypes, cluster IV with 5 genotypes and cluster V with 4 genotypes. Remaining clusters viz, II,VI and VII were solitary. There was no relationship between II and VII, indicating maximum divergence among genotypes. The highest intra cluster distance was recorded for cluster V. Six characters viz. Starch content, weight of corn pr plant, days to 50% plant emergence, dry matter content, average weight of cornel and weight of cornel per plant were the chief character contributed towards diversity. Cluster means analysis and inter cluster distance suggested crosses can be made involving the selected dgenotype(s) under cluster II (CHFCOL-34),cluster VI (CHFCOL-36) and Cluster V (CHFCOL-2) with genotype under cluster VII (CHFCOL-4) to obtain high heterotic crosses and superior segregates. The genotypes viz, CHFCOL-1 (cluster III) and CHFCOL-4 (cluster VII) were found to be superior and are worth enough for advanced yield traits for future release.
Description
study on colocasia esculenta as very useful as vegetable in north eastern region of India. Assessment of Genetic Diversity in Taro [Colocasia esculenta (L.) Schott]. the thesis submitted for the part fullfillment in M.Sc. Horticulture in Vegetable Science. to Central Agricultural University Imphal.
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