Kenga, R. and Alabi, S.O. and Gupta, S.C.
(2003)
Yield Stability Of Sorghum Hybrids And Parental Lines.
African Crop Science Journal, 11 (2).
pp. 65-73.
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Abstract
Seventy-five sorghum hybrids and twenty parental lines were evaluated for two consecutive years at two locations. Our objective was to compare relative stability of grain yields among hybrids and parental lines. Mean grain yields and stability analysis of variance, which included linear regression coefficient (bi) and deviation from regression (S2d) were used to determine relative stability. Genotypes x environment interactions were significant. Significant hybrids x environment interactions were also detected. Hybrids and parental lines had significantly different regression coefficients, as indicated by hybrid-environment (linear) mean squares. Hybrids showed significantly higher mean yield compared with parental lines and the yield advantage generally increased with increasing environmental yield potential. Hybrids bi values were significantly higher (0.02 - 2.14) than for parental line (-0.82 - 1.52). Deviations from regression for hybrids were higher than those of parental line. Crosses between hybrids ICSA 38 x Damougari, and ICSA 39 x Damougari produced the highest grain yields. Their bi values were not significantly different from unity, but S2d estimates were significantly greater than zero. Thirteen hybrids recorded bi values close to unity, small S2d and grain yields higher than the mean of all the hybrids. Based on our findings it is apparent that in the dry land agriculture of west Africa, selection of hybrids for superior yields across environments should be emphasized first, and then the relative stability of these hybrids over environment should be determined.
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