Summary
In diallel crosses of Io plants of pointed headed cabbage a significant sca variance for head weight and a significant gca variance for earliness was found.
In a diallel set of inbred lines the sca variance for plant weight decreased when plants were harvested later, while the gca variance increased. By means of the Hayman-Jinks analysis clear overdominance but no epistatic effects could be recorded.
Double crosses and mass propagated single crosses were inferior compared with single crosses and proved to be not attractive for horticultural practice.
Already in a young plant stage differences in plant weight between inbred and hybrid plants were noted in favour of the latter. During the growth period this difference increased. Single crosses produced relatively fewer outer leaves than double crosses and inbred lines.
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Nieuwhof, M., Garretsen, F. Hybrid breeding in early spring cabbage (Brassica oleracea var. Capitata L. F. Alba D.C.). II. Euphytica 24, 87–97 (1975). https://doi.org/10.1007/BF00147172
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DOI: https://doi.org/10.1007/BF00147172