Genotype × Environment Interaction Bias in Heritability Estimates for Cut-flower Yield of Greenhouse Gerberas

in Journal of the American Society for Horticultural Science
Authors:
Thomas ByrneDepartment of Environmental Horticulture, University of California, Davis, CA 95616

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Dana DrennanDepartment of Environmental Horticulture, University of California, Davis, CA 95616

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James HardingDepartment of Environmental Horticulture, University of California, Davis, CA 95616

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Abstract

Statistics were developed to measure the relative importance of genotype × environmental (GE) interactions. Estimates indicate that as much as half of the genetic variance for cut-flower yield in the Davis Population of Gerbera may be attributable to GE interactions. The bias this causes in broad-sense heritability estimates averaged 10.3% ± 2.97% for single-factor interactions; 15.6% ± 3.52% for 2-factor interactions, and 26.8% ± 3.45% for 3-factor interactions. The mean unadjusted broad-sense heritability for cut-flower yield in the same experiments was 37.1% ± 6.54%. Therefore, response equations that do not take interaction bias into account will overestimate selection potential.

Contributor Notes

Received for publication 2 June 1986. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.

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