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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/22152

Title: Yield stability analysis of promising potato clones in mid and high altitude regions of Kenya
Issue Date: 31-Dec-1998
Publisher: African Crop Science Society
Citation: African Crop Science Journal (ISSN: 1021-9730) Vol 6 Num 2
Abstract: African Crop Science Journal, Vol. 6. No. 2, pp. 137-142, 1998 Yield stability analysis of promising potato clones in mid and high altitude regions of Kenya C. LUNG'AHO, P.S. OJIAMBO and H.M. KIDANEMARIAM Code Number:CS98015 Sizes of Files: Text: 37K Graphics: No associated graphics files ABSTRACT Eleven promising potato clones possessing late blight tolerance were evaluated for tuber yield performance, stability and adaptation across ten environments of medium and high potential potato growing regions of Kenya. Results of combined analysis of variance for tuber yield showed significant effects of genotypes, environments, and genotype by environment interaction. The mean tuber yield for individual clones ranged from 22.80 to 37.63 t ha-1. When the genotypic tuber yields were subjected to stability analysis against an environmental index, the regression coefficients for individual clones ranged between 0.427 and 1.687. Among the clones tested, KP90188.3 was the most stable genotype across all the ten environments, while four of the highest yielding clones; 387792.5, 378699.2, 381381.20 and 381381.13 appeared to be specifically adapted to favourable growing conditions. Two clones, 381381.13 and 381381.20 exhibited mean superior performance in yield across all environments, and were pre-released in 1996 pending multiplication of sufficient quantities of seed. Key Words: Multilocation trials, potato clones, Solanum tuberosum RÉSUMÉ Onze clones prometteurs de pomme de terre ayant une tolérance au mildiou ont été évalués pour performance en rendement des tubercules, la stabilité et l'adaptation dans dix environnements à potentiel moyen et élevé pour la production de la pomme de terre au kenya. Les résultats de l'analyse combinée de la variance du rendement en tubercules ont mis en évidence des effets significatifs des génotypes, des environnements, et de l'interaction entre génotype et environnement. Le rendement moyen en tubercules pour les clones individuels varie de 22, 8 à 37, 6 t ha-1. Lorsque les rendements génotypiques de tubercules étaient soumis à l'analyse de la stabilité contre un indice environnemental, les coefficients de régression pour les clones individuels variaient de 0, 427 à 1,687. Parmi les clones testés, KP 90188.3 était le génotype le plus stable dans tous les environnements, alors que quatre des clones 387792.5, 378699.2, 381381.20 et 381381.13 semblaient spécialement adaptés aux conditions favorables de croissance. Deux clones, 381381.13 et 381381.20, ont montré une performance moyenne supérieure à travers tous les environnements. Ils étaient pré-diffusés en 1996 en attendant la multiplication des quantités suffisantes de semences. Mots Clés: Essais multilocaux, clones de pomme de terre, Solanum tuberosum Copyright 1998 The African Crop Science Society
URI: http://hdl.handle.net/1807/22152
Other Identifiers: http://www.bioline.org.br/abstract?id=cs98015
Rights: Copyright 1998 African Crop Science Society
Appears in Collections:Bioline International Legacy Collection

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