Although roasted flavor of peanut (Arachis hypogaea L.) seed is an important attribute with respect to consumer acceptance, little is known about the relative influences of cultivar, environment, and their interaction on expression of the trait. From 1986 to 1991, samples of seven peanut cultivars were obtained from peanut research programs representing the three major production areas in the United States. Samples were roasted to a nearly common color, ground into paste, and assessed for roasted flavor and fruity attribute by a trained sensory panel. CIELAB Lab color was also measured for use as a covariate in statistical analysis to adjust for remaining differences in color. Subsets of the data were constructed to be orthogonal for cultivar and environment. Environmental variation was highly significant for all subsets and for the overall data set with variation among years being the largest component. Production regions were not a significant source of variation, but locations within years and regions were significant. Cultivars varied significantly in most cases with the runner cultivars Florunner and Marc I consistently superior in flavor to virginia cultivars Florigiant, NC 7, NC 9, and NC-V 11. There were no significant differences among the virginia cultivars. Pronto, a spanish cultivar, was comparable to the virginia cultivars in flavor. Cultivar-by-environment interaction was significant in the overall data set and in most of the orthogonal subsets. The main component of interaction in the overall set was cultivar-by-location interaction within years and regions. Results were inconsistent in the various subsets with cultivar-by-region interaction being significant only in one subset. Components of variance and standard errors of cultivar mean comparisons estimated from the overall data set indicate that design of field experiments to compare genotypic means should emphasize replication across year-location combinations rather than replication within combinations. For accurate estimation of means, replication across several years is necessary, but for comparison of genotypes, additional locations may be substituted for years.
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Keywords: Arachis hypogaea L, breeding, variance components, experimental design
How to Cite:
Pattee, H. & Isleib, T. & Giesbrecht, F.,
(1994) “Genotype-by-Environment Interaction in Roasted Peanut Attribute¹”,
Peanut Science 21(2),