TITLE:
Genotype by Environment Interaction Analysis for Tuber Yield of Potato (Solanum tuberosum L.) Using a GGE Biplot Method in Amhara Region, Ethiopia
AUTHORS:
Mulugeta Gedif, Dessalegn Yigzaw
KEYWORDS:
G; GxE; GEI; Ideal Environment; Ideal Genotype
JOURNAL NAME:
Agricultural Sciences,
Vol.5 No.4,
March
7,
2014
ABSTRACT:
Potato is one of the
important crops grown in mid and high altitude areas of Ethiopia. Several potato
genotypes have been introduced in different parts of this region. However, the
stability and performance of these genotypes are not yet assessed. Therefore, the objective of this study was to determine the
effect of genotype, environment and their interaction for tuber yield and
identify stable potato genotypes. The study was conducted using eight potato
genotypes in rainfed production season of years 2010 and 2011 at five potato
growing locations in the region. Randomized complete block design with three
replications was used for the experiment. Among the testing locations, the
superior mean tuber yield (25.43 t/ha) was obtained at Adet while the inferior
(13.89 t/ha) was at Injibara. Similarly, among the genotypes, CIP-396004.337 gave the highest mean tuber yield (25.66 t/ha), while
CIP-395011.2 gave the lowest (17.78 t/ha). Combined ANOVA indicated that the
main effects due to environments, genotypes and genotype by environment interaction were
highly significant. The contribution of E, G and GEI to the total variation in
tuber yield was about 47.11%, 8.83% and 44.07%, respectively. The GEI was
further partitioned using GGE biplot model. The first two principal components
obtained by singular value decomposition of the centered data of tuber yield explained
71.26% of the total variability caused by (G + GE).
Out of these variations, PC1 and PC2 accounted 51.24% and 20.02% variability, respectively. GGE biplot
view of this study identified Serinka as ideal testing location and
CIP-396004.337 as ideal genotype for Amhara region in Ethiopia.