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Heritabilities of Some Agronomic Characters for the Interspecific Cross of Crambe abyssinica and C. hispanica¹

Plant selections from PI 247310 (C abyssinica) and PI 279346 (C. hispanica) were paired randomly and hybridized to determine variability present among progeny and to gain estimates of heritabilty for seedling emergence, first bloom, 95% bloom, maturity, height, seed yield, seed size, test weight, and oil percentage. Two experiments were conducted in 1971. Experiment 1 contained parents, F₁'s, and F₂'s and Experiment 2 contained parents, F₃'s, and F₄'s. Significant differences were found among F₃ and F₄ entries for all characters except oil percent with ranges in the F₄ exceeding that of the parents for 95% bloom, maturity, height, seed size, and test weight. Evidence of heterosis was detected for yield, test weight, and oil percent since the means of the Fa generation for these traits exceeded those of either parent. If characters are ranked according to their heritability estimates, seed yield, oil, and maturity were the lowest; test weight, emergence, height, and seed size were intermediate; and first bloom and 95% bloom were highest.

Key Words: Heterosis • Variability

² Formerly Graduate Research Assistant (Present address: O. M. Scott & Sons, Marysville, Ohio 43040) and Professor, Agronomy Department, Purdue University.

Received for publication August 1, 1972.