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Genetic Variation in Quantitative Characters in Maize Inbred Lines, II. Effects on Performance in Single-Cross and Double-Cross Hybrids¹

Six inbred lines and seven single crosses involving these lines were obtained from four Corn Belt foundation seed stock organizations and the Iowa Agriculture Experiment Station. The genetic variation among the strains within inbred lines and among single crosses of the same pedigree was investigated. The inbred strains were compared in testcrosses with three unrelated inbred lines and the single crosses were compared in nine double-cross hybrids. Tests in 10 environments, five locations for two years, revealed significant differences for percentage moisture among strain testcrosses within all inbreds and for yield in all except two of the inbreds. Strains included pollen restorer (Rf) and nonrestorer (rf) versions, except for two lines in which only rf versions were available. Significant variations were obtained for Rf vs. rf strain testcrosses, among Rf strain testcrosses, and among rf strain testcrosses. The Iowa Rf strain testcrosses were not different from the remaining Rf strain testcrosses for yidd, but the Iowa rf strain testcrosses compared with the remaining rf strain testcrosses were significantly different for yield within three of the six inbreds and for moisture within five of the six inbreds. Among strains within double crosses there were significant differences for percentage moisture in eight hybrids and for yield in four hybrids. Yield differences were great enough to be of practical importance in some cases, whereas moisture differences were not considered of practical importance even though many were statistically significant.

Key Words: Zea Mays L. • Pollen Restorer Gene • Maize Inbred Strains

² Formerly Associate, Iowa Crop hnprovement Association (now Assistant Professor of Agriculture, Wisconsin State University, Platteville, Wis.) and Professor, Iowa State University.

Received for publication November 22, 1967.