Journal of Food, Agriculture and Environment

Vol 7, Issue 1,2009
Online ISSN: 1459-0263
Print ISSN: 1459-0255

The performance profile of Dioscorea rotundata cultivar Dorban genotypes in Ghana using GGE biplot analysis


Emmanuel Otoo 1*, Robert Asiedu 2

Recieved Date: 2008-09-18, Accepted Date: 2008-12-15


Twenty-two genotypes of D. rotundata cultivar Dorban consisting of 19 botanically developed seeds and 3 vegetative checks were evaluated in 15 environments from 2000 to 2004 using CRD to assess the effect of genotype and genotype x environment interaction on the tuber yield of 22 white yam (D. rotundata L. cv. Dorban) genotypes via GGE (genotype plus genotype x environment) biplot methodology. The GGE biplot procedure was used to determine the yield potential and stability of the genotypes. Significant differences (p<0.001) were observed in all cultivars with respect to genotype, environment and genotype by environment interactions. Biplot analysis identified three mega-environments corresponding to the three agroecologies – Fumesua (Forest) was the most representative and discriminating environment followed by Bodwease (Coastal Savannah) and Wenchi (Forest-Savannah Transition). Genotypes Gdo02, Gdo03, Gdo20 and Gdo01 including the three checks were identified as superior. Genotype Gdo016 was the worst genotype.


D. rotundata, genotypes, genotype x environment interaction

Journal: Journal of Food, Agriculture and Environment
Year: 2009
Volume: 7
Issue: 1
Category: Agriculture
Pages: 150-155

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