ISSN: 0041-3216 (Online), 0041-3216 (Print)
Volume 80 Number 2
Phenotypic stability for tuber yield in elite potato (Solanum tuberosum L.) genotypes in eastern Ethiopia. (110)
An experiment was conducted during the 1998 and 1999 cropping seasons at six different locations in eastern Ethiopia to study the phenotypic stability of nine medium-maturing elite potato (Solanum tuberosum L.) genotypes and to understand the nature and magnitude of genotype by environment (G x E) interaction in potato. At all locations, the experimental plots were arranged in a randomized complete block design with three replications. Significant differences among genotypes were observed and the G x E interaction was also significant. Both linear and non-linear components of G x E interactions were found to be important with a predominance of the former. The CIP-389668-4 clone exhibited above average responsiveness along with stability, indicating that it had specific adaptability for favourable environments. The next highest-yielding clone was CIP-388764-26 with stable average responsiveness, indicating that it had general adaptability. The third highest-yielding genotype (CIP-387412-2) was unstable. Similarly, Chiro, the widely grown potato genotype (control) was found to be unstable. Clone CIP-388764-26 is recommended for regional release.
Keywords: Potato; Stability; Phenotype; Environment; G x E Interaction; Tuber yield; Eastern Ethiopia