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Journal of Agronomy
Year: 2006  |  Volume: 5  |  Issue: 3  |  Page No.: 391 - 395

Correlation and Path Analysis in Sweet Potato and their Implications for Clonal Selection

Engida Tsegaye, E.V. Devakara Sastry and Nigussie Dechassa    

Abstract: Understanding interrelationships among various agronomic traits is vital to plan an effective breeding program in sweet potato (Ipomoea batatas (L.) Lam.). This study was undertaken to determine associations among yield and yield related traits in the crop plant so as to identify the major traits of importance that could be used as a basis for clonal selection. A replicated field experiment was carried out using thirty sweet potato genotypes selected at random from the germplasm collection of diverse origin. Observations were made on ten characters. Phenotypic as well as genotypic correlation coefficient analyses revealed that storage root yield had positive and significant correlation with individual storage root weight, harvest index and storage root girth. Number of storage roots per plant was negatively and significantly correlated with individual storage root weight and storage root girth indicating the presence of compensatory relationship between number of storage roots per plant and the latter two traits. Path coefficient analysis for storage root yield also revealed that individual storage root weight, number of storage roots per plant and harvest index were the most important determinants of storage root yield. It could be concluded that due to the high estimated positive correlation and positive direct effect of individual storage root weight and harvest index on storage root yield, these traits would be most suitable for indirect selection in sweet potato improvement programs that aim at increasing storage root yield.

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