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Journal of Agronomy
  Year: 2007 | Volume: 6 | Issue: 1 | Page No.: 94-99
DOI: 10.3923/ja.2007.94.99
Genetic Variability for Yield and Other Agronomic Traits in Sweet Potato
Engida Tsegaye , Nigussie Dechassa and E.V. Devakara Sastry

Abstract:
Understanding the nature and magnitude of variability among sweet potato (Ipomoea batatas (L) Lam.) genotypes for traits of economic importance is vital to plan effective breeding programs. A replicated field experiment was carried out using thirty sweet potato genotypes selected at random from the germplasm collection of diverse sources. The specific purpose was to estimate the nature and magnitude of variability among yield and yield related traits in the crop plant. Observations were recorded on sixteen characters. The analysis of variance revealed that there were highly significant (p<0.01) differences among the genotypes for all the characters. Wide ranges of genotypic variability were observed among the genotypes for most of the characters. In vine traits, 32.4 to 82.5% of the observable variability was due to the genetic variation while in root traits this value ranged from 43.04 to 76.81% indicating the existence of immense inherent variability among the genotypes. The contributions of genetic variance to phenotypic variance were only 32.4 and 43.04%, for above ground dry matter content and storage root dry yield per plant, respectively suggesting the important role of environment in the expression of these traits. High genotypic coefficients of variation along with high heritability and expected genetic advances were recorded for vine length, vine internode length, leaf area, above ground fresh and dry weights, number of storage root per plant, individual storage root weight, storage root fresh yield per plant. Thus, future improvement of the crop plant should exploit the genetic variability available in the germplasm collection.
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How to cite this article:

Engida Tsegaye , Nigussie Dechassa and E.V. Devakara Sastry , 2007. Genetic Variability for Yield and Other Agronomic Traits in Sweet Potato . Journal of Agronomy, 6: 94-99.

DOI: 10.3923/ja.2007.94.99

URL: https://scialert.net/abstract/?doi=ja.2007.94.99

 
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