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Inheritance of Resistance to Midge, Contarinia sorghicola Coq. in Sorghum, Sorghum bicolor (L.) Moench*

Published online by Cambridge University Press:  19 September 2011

B. L. Agrawal ,
C. V. Abraham  and
L. R. House
B. L. Agrawal
Affiliation:
Cereals Improvement Program, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru P.O., Andhra Pradesh 502 324, India.
C. V. Abraham
Affiliation:
Cereals Improvement Program, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru P.O., Andhra Pradesh 502 324, India.
L. R. House
Affiliation:
Cereals Improvement Program, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru P.O., Andhra Pradesh 502 324, India.
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Abstract

Inheritance of resistance to sorghum midge, Contarinia sorghicola Coq. was studied on a set of 21 diallel crosses involving four midge-resistant and three susceptible sorghum, Sorghum bicolor (L.) Moench cultivars under natural midge infestation at Dharwad during the late rainy season (August to November) 1983. Both additive and nonadditive genetic variances were important for midge resistance. The parents, DJ 6514 and TAM 2566, proved as better general combiners. Mean performance of the parents and their general combining ability (GCA) effects were strongly correlated. Crosses with positive specific combining ability (SCA) effects in both F1 and F2 generations had at least one parent with high GCA effects and better per se midge resistance. Midge-resistant parents, DJ 6514 and TAM 2566, with high per se resistance and GCA effects should be utilized in breeding for midge resistance.

Résumé

Cet article présente l'étude de l'héritabilité de la résistance à la cécidomyie du sorgho, Contarinia sorghicola Coq. portant sur un ensemble de 21 croisements diall èles comprenant 4 cultivars de sorgho, Sorghum bicolor (L.) Moench résistants et 3 sensibles à la cécidomyie. L'étude a été effectuée dans les conditions de l'infestation naturelle par cet insecte à Dharwad, vers la fin de la saison des pluies (août à novembre), 1983. Les variances génétiques additives et les variances génétiques non additives sont toutes les deux importantes pour la résistance à la cécidomyie. Les parents DJ 6514 et TAM 2566 se sont avérés de très bons combinateurs généraux. Une forte corrélation a été constatée entre la performance moyenne des parents et leurs effets d'aptitude générale à la combinaison (AGC). Les croisements avec des effets d'aptitude spécifique à la combinaison (ASC) positifs au niveau des générations FI et F2 avaient au moins un parent ayant d'importants effets d'aptitude générale à la combinaison (AGC) et une meilleure résistance à la cécidomyie. Des parents résistants à la cécidomyie, réunissant une forte résistance et des effets AGC imnortîints. doivent être exnloités dans la sélection nonr la résistance à la cécidnmyie.

Keywords

Sorghum bicolor (L.) Moenchcombining abilitymidgeContarinia sorghicola Coq.resistanceinfester rowgene actiongenetics
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 9 , Issue 1 , February 1988 , pp. 43 - 45
Copyright
Copyright © ICIPE 1988

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References

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