Yield stability analysis of late blight resistant potato selections
Abstract
210 words
Potato is an important source of food and income in the highlands of East Africa. Identification of superior
genotypes for improved agronomic characteristics will enhance tuber yield. Seven promising clones from
population B potato selections (quantitative resistance to late blight) obtained from the International Potato
Center, two genotypes from population A (qualitative resistance) and three control cultivars were evaluated
for three cropping seasons at four locations in western Uganda in order to determine performance and yield
stability. The additive main effects and multiplicative interactive (AMMI) model was used for the analysis.
The analysis of variance of yield data for genotypes × locations, genotypes × seasons and genotypes ×
locations × seasons was significant (p < 0.05) showing the variable response of genotypes and the need for
stability analysis. The AMMI statistical model showed that the most stable genotypes were 392618.250 (B5)
and 392127.270 (B6) (high yield) and 392618.256 (B1), 391049.255 (B2) and 392127.256 (B7) (low yield)
and had negligible interactions with the environments. Across environments, the ranking of genotypes for
tuber yield was not consistent. The clones 381471.18 (A2), 387121.4 (A1) and cultivar Victoria had high
average yields, but these yields were below average in a few environments. Selective deployment of cultivars
can improve tuber yield in the highland tropics.
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