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Titre :
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Genetics of resistance to Aphis craccivora in cowpea
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Auteurs :
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S. Githiri ;
K. Ampongnyarko ;
E. Osir ;
P. Kimani
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Type de document :
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article/chapitre/communication
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Année de publication :
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1996
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Format :
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371-376
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Langues:
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= Anglais
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Mots-clés:
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allelism
;
Aphis craccivora
;
cowpea
;
genetics of resistance
;
modifiers
;
Vigna unguiculata
;
cowpea aphid
;
Genetique de la resistance
;
Degat
;
Test de resistance
;
Aphididae
;
Leguminosae
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Résumé :
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Inheritance of aphid resistance and allelic relationships among sources of resistance was studied in the parents, F-1, F-2, F-3, and backcross populations of cowpea crosses. Each 4-day old seedling was infested with five fourth-instar aphids. Seedling reaction was recorded 14-16 days after infestation when the susceptible check was killed. The segregation data from eight crosses between resistant and susceptible cowpea cultivars indicated that aphid resistance was inherited as a monogenic dominant trait. Segregation data from crosses among eight resistant cultivars indicated that one or two loci and modifier(s) were involved in the expression of resistance to aphids: It was suggested that further studies on allelism among sources of resistance needed to be conducted in order to resolve this.
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Source :
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Euphytica - 0014-2336, vol. 89, n° 3
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