Heritability estimates of some root characters in sweetpotatoes
1994
Sta Cruz, M.T.L.G. | Chujoy, E. (International Potato Center, P.O. Box 933, Manila (Philippines))
Local sweetpotato clones and their respective open pollinated offspring were evaluated in 6 experiments over a period of 3 years to estimate correlations and heritabilities (h raised to the second power) of root characters: yield, number, size and dry matter and root damage by the weevil (Cylas formicarius). Correlations between root size and root yield were positive and significant, ranging from 0.376 to 0.934; whereas root dry matter yield content was negatively correlated with root yield with correlations ranging from -0.242 to 0.384. Significant rank correlations for root yield between parents and offspring were found and these ranged from 0.47 to 0.63. Narrow sense heritabilities ranged from 0.113 to 0.750 for root yield; 0.029 to 0.723 for root number per plant; 0.067 to 0.746 for root size and; 0.259 to 0.490 for root dry matter content. Heritabilities for root damage were 0.271 and 0.393 (by number and by weight) in the selected weevil resistant clones and lower from the group of clones selected for high yield (h raised to the second power=0.130 plus or minus 119 and 0.065 plus or minus 120 respectively). Higher heritabilities may be the result of high frequency of genes controlling resistance. The results indicate that progress in selection for weevil resistance, dry matter content, root yield may be possible where selected sweetpotatoes for the characteristics involved are utilized in breeding
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