Genetic Variability for Yield and Yield Related Traits in Orange-FleshedSweetpotato Genotypes Evaluated at Hawassa, Ethiopia
2021
The study was conducted to determine variability for yield and yield related traits in 24 orange fleshed sweetpotato
[Ipomoea batatas (L.) Lam] genotypes in the 2017 main cropping season at Hawassa Agricultural Research Center.
The experiment was laid out in Randomized Complete Block Design with three replications. Data were collected on
19 traits and analysis of variance (ANOVA) was conducted. Significant differences (P≤0.05) among genotypes were
observed for root yield and its components as well as morphological and qualitative traits including sweetpotato
virus disease reaction (SPVD). The phenotypic coefficient of variation (PCV) ranged from 22.1 % for mature leaf
size to 118.3 % for unmarketable root yield, while genotypic coefficient of variation (GCV) ranged from 20.6 % for
root girth to 111.7 % for unmarketable root yield. All the traits studied showed PCV and GCV more than 20%,
suggesting high variability and this could be used for selection of superior genotypes with respect to character of
interest. Most traits showed high values for broad sense heritability which ranged from 66.7 to 100 %, indicating
low environmental influence in the observed variation. High heritability coupled with high genetic advances as
percent of mean were observed for marketable root yield, root skin color, root beta carotene content, harvest index,
vine length, vine inter-node length and above ground fresh weight, implying that, these characters are governed by
additive gene action and selection would be rewarding for the further improvement of such traits.
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