Phenotypic Epistasis for Ten Quantitative Characters in Maize 1

SINCE there has been no general agreement on an adequate explanation of heterosis, Sprague (12) has stated that studies which will contribute information about gene action involved in heterosis should be vigorously explored. This study was undertaken to gather information with currently useful breeding materials relative to the prevalence of epistatic gene action and its interactions with environments. Additional knowledge along these lines should be valuable in planning future fundamental studies, in practical breeding efforts, and in interpreting maize inbred and hybrid performance experiments in diverse environments.