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Inheritance of resistance in grain sorghum to Chilo partellus (Swinhoe)

Published online by Cambridge University Press:  08 April 2017

W. G. Wenzel  and
J. Van Den Berg
W. G. Wenzel
Affiliation:
Summer Grain Centre, Private Bag X1251 Potchefstroom, South Africa
J. Van Den Berg
Affiliation:
Summer Grain Centre, Private Bag X1251 Potchefstroom, South Africa
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Abstract

The inheritance of resistance in grain sorghum to the spotted stemborer, Chilo partellus (Swinhoe) (Lepidoptera: Pyralidae) was studied in F3 plants derived from crosses between nine locally adapted inbred lines and two sources of resistance. Antibiosis resistance was measured as the relative growth rate of larvae in the whorls of 6-week-old plants. Most F3 plants were either as resistant as, or more resistant than, the resistant parent. This indicated dominance of resistance over susceptibility and the occurrence of transgressive segregation. The segregation pattern in the F3 generation suggested the presence of at least four dominant genes. Two families homozygous for these genes were identified.

Résumé

Le caractère héréditaire de la résistance au foreur ponctué du sorgho, Chilo partellus dans la graine de sorgho a été étudié sur les plantes F3 dérivées de croisements effectués entre neuf lignées adaptées localement, et deux sources de résistance. La résistance antibiotique a été mesurée en termes de taux de croissance relatif des larves dans les verticilles de plantes âgées de six semaines. La plupart des plantes F3 ont été soit autant résistantes, ou plus résistantes que le parent résistant. Ceci indique le caractère dominant de la résistance sur la susceptibilité, ainsi que l'existence d'une ségrégation transgressive. Le schéma de ségrégation dans les F3 suggère la présence d'au moins quatre gènes dominants. Deux familles homozygotes pour ces gènes ont été identifiées.

Keywords

Chilo partellus, grain sorghum, resistanceChilo partellusgraine de sorghorésistance
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 16 , Issue 1 , March 1995 , pp. 83 - 86
Copyright
Copyright © ICIPE 1995

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References

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