Performance of nine cassava (Manihot esculanta Crantz) clones across
Peprah Bright Boakye1*, Ofori Kwadwo2, Asante Isaac K.3 and Elizabeth Yaa Parkes1,4
1Crops Research Institute, Fumesua, Kumasi, P. O. Box 3785, Ghana.
2Department of Crops Science, University of Ghana, Legon.
3Department of Botany, University of Ghana, Legon.
4International Institute of Tropical Agriculture, Ibadan, Oyo State, Nigeria.
Accepted 18 March, 2013
The study was carried out to quantify the genotype × environment interaction
(G × E) and to estimate the phenotypic stability by genotype genotype × environment
(GGE) biplot of nine cassava clones comprising 5 hybrids, 3 parent checks and 1
improved variety. The study was planted across three different environments; Fumesua, Pokuase
and Ejura representing forest, coastal savanna and forest transition zones, respectively.
Genotype main effect was significant (P < 0.001) for fresh root yield and dry matter content,
G × E interaction effect was significant (P < 0.001) for fresh root yield only and
environment main effect was significant (P < 0.01) for only fresh root yield. The most stable
clone for fresh root yield with above average performance was La02/026 (hybrid).
The high genotype and low environment effects, and the relatively low interaction on dry matter
content imply that evaluation and selection can be effectively done in fewer environments to
select clones with high performance for the trait whiles fresh root yield requires multiple
environments to identify clones with broad and specific adaptation.
Key words: Genotype genotype × environment (GGE) biplot, stability, fresh foot yield, dry matter content,
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