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Published in Crop Sci 25:749-752 (1985)
© 1985 Crop Science Society of America
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Diallel Analysis of Aluminum Tolerance in Selected Lines of Grain Sorghum1

S. R. Boye-Goni and V. Marcarian2

A half-diallel cross involving three Al-tolerant and three Al-sensitive sorghum genotypes as identified through a screening test was used to study the inheritance of Al tolerance in grain sorghum [Sorghum bicolor, (L.) Moench]. Data from the Ft generation and parents were analyzed using the Grilllng and the Jinks-Hayman methods of diallel analyses. Highly significant general combining ability (GCA) a~d specific combining ability (SCA) effects were observed for the Al-tolerance trait. The GCA effects were much more important than SCA effects, the ratio being 9:1. From the Vr-Wr graph, the Al-tolerance trait showed predominantly additive genetic effects with some degree of dominance. The six parents fell into four groups according to the relative level of dominance: (i) highly dominant (AK 3010, 182), (ii) moderately dominant (NB 9040), (iii) moderately cessive (‘Texas Blackhull Kafir’), and (iv) highly recessive 3001 and AK 3006). The average degree of dominance was partial. Heritability of Al-tolerance in the genotypestudied was high. Narrow-sense and broad-sense heritabilities were 78 and 99%, respectively. The additive gene action and the high heritability for this trait should make either pedigree breeding or recurrent selection successful for the development of Al-tolerant grain sorghum inbreds.

Key Words: Diallel cross • Combining ability • Inheritance • Sorghum bicolor (L.) Moench • Dominance

1 Contribution from the Arizona Exp. Stn. Journal Article no. 3734. Part of a thesis submitted by the senior author to the Graduate College, Univ. of Arizona in partial fulfillment of the requirements for the Ph.D. degree. The research was supported in part by the Sorghum/Millet Title XII CRSP.

2 Former graduate student, currently researcher at Ahmadu Bello Univ., Kano, Nigeria; and Adjunct Assistant Professor, Dep. of Plant Sciences, Univ. of Arizona, Tucson, AZ 85721.

Received for publication February 24, 1983.




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