S Kumar, P K Singh, K Kumar and B K Singh
Journal of Root Crops 36 (1): 105-110, 2010.
ABSTRACT
Analysis of eleven horticultural and quality traits among 35 collections of elephant foot yam revealed the presence of adequate variability which could be harnessed for developing cultivars with high yield potential. Based on individual corm weight, corm yield, dry matter and starch content the following collection such as NDA-35, NDA-9, NDA-5, NDA-14, NDA-4 and NDA-10 were identified as promising for cultivation. The phenotypic and genotypic coefficients of variation were high for number of cormel, weight of individual corm, yield, size of cormel and size of individual corm. Moderate to high heritability was evident for all the traits and was accompanied with high genetic advance for weight of individual corm, size of cormel, yield, size of individual corm, number of cormel which suggests the role of additive gene action and thus a high genetic gain is expected from selection of these traits. Moreover, high heritability along with moderate genetic advance for starch content, plant height, canopy spread and stem girth reveals the presence of additive and non-additive gene action simultaneously. The starch content, plant height, weight of individual corm, size of individual corm, stem girth, canopy spread and dry matter were the most important yield contributing traits based on correlation study. Among them, dry matter, starch content, size of individual corm and plant height showed major effect upon yield as a consequence of direct effect and provides most effective selection indices for improvement of elephant foot yam.
Keywords: Elephant foot yam, variability, heritability, correlation and path coefficient.
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