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Articles by E.V. Devakara Sastry
Total Records ( 2 ) for E.V. Devakara Sastry
  Engida Tsegaye , E.V. Devakara Sastry and Nigussie Dechassa
  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.
  Engida Tsegaye , Nigussie Dechassa and E.V. Devakara Sastry
  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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