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Analysis of Genotype-Environment Interactions of Potato Yield¹

Three methods were used to study genotype-environment (GE) interactions of potato (Solanum tuberosum L.) yield. They were chosen to represent single (stability variance ₂ of Shukla, 1972), two (genotypic stability parameters , of Tai, 1971), and three (genotypic components v₁, v₂ and v₃ of Tai, 1975) parameters of measurement of genotypic contributions to the GE interactions. Data of marketable yield (W) and three yield components: number of stems/plot (X), number of tubers/stem (Y), and mean tuber weight (Z) of 30 genotypes were collected from nine trials in New Brunswick. Significant differences were found for ₂, , and among the genotypes. The estimates of ₂ were highly correlated to those of . Both parameters showed a curvilinear relationship with v₁ and v₂ suggesting low ₂ and values were due to moderate genotypic responses to the environmental components (r₁ and r₂) supporting X and Y. The linear response parameter showed close association with v₃ which measured the genotypic response to the environmental component (r₃) supporting Z. The estimates of v₃ showed a moderately positive correlation with the mean marketable yield (W) and were larger than those of v₁ and v₂ for most genotypes. The estimates of r₃ were larger and more variable than those of r₁ and r₂ over the environments. It is thus concluded that difficulty would be encountered locating high yielding genotypes without sensitive responses to the variation of r₃.

Key Words: Stability • Yield components • Potato breeding • Solanum tuberosum L.

² Research Scientist, Research Station, Research Branch, Agriculture Canada, Fredericton, New Brunswick, E3B 4Z7, Canada.

Received for publication November 1, 1977.