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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/23692


Title: Yield stability of sorghum hybrids and parental lines
Authors: Kenga, R.
Alabi, S. O.
Gupta, S. C.
Keywords: Genotype x environment interaction, regression coefficeints, sorghum bicolor, West Africa
Interaction génotype x environnent, hybrides du sorgho, stabilité, Afrique de l'Ouest
Issue Date: 31-Dec-2003
Publisher: African Crop Science Society
Citation: African Crop Science Journal (ISSN: 1021-9730) Vol 11 Num 2
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.
URI: http://hdl.handle.net/1807/23692
Other Identifiers: http://www.bioline.org.br/abstract?id=cs03009
Rights: Copyright 2003 - African Crop Science Society
Appears in Collections:Bioline International Legacy Collection

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