Received for publication January 26, 1981. Journal Paper No. J-10155 of the Iowa Agriculture and Home Economics Experiment Station, Ames, Iowa. Project No. 2452.
Research Assistant, Department of Horticulture; Research geneticist, USDA, SEA, AR and Professor, Department of Genetics; and Professor, Department of Horticulture, respectively. The authors are indepted to Prof. C. C. Bowen, Department of Botany, for his generous help in this study.
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