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Inheritance of internode length,plant form,and annual habit in a cross of cabbage and broccoli (Brassica oleracea var. capitata L. and var. italica Plenck.)
Authors:P. J. Pelofske  J. R. Baggett
Affiliation:(1) Department of Horticulture, Oregon State University, 97331 Corvallis, OR, USA;(2) Present address: Department of Plant Science, University of Idaho, 83843 Moscow, Idaho, USA
Abstract:Summary When an inbred line of cabbage, Brassica oleracea L. var. capitata L., was crossed with an inbred line of broccoli B. oleraceae var. italica, the F1 progeny were vigorous late annuals. All F1 × broccoli backcross plants and 92% of the 3260 F2 plants were annuals, while 40% of the F1 × cabbage backcross plants were biennials. Annual habit is thus dominant and controlled by more than a single gene. Number of days to bud appearance in annuals varied continuously, and was primarily additive in inheritance. F1 data suggested partial dominance for lateness but this was not supported by the F2. Internode length was also continuous in distribution and primarily additive in inheritance, but with some dominance for short internodes in the F1. Cabbage head forming ability was recessive and multigenic, with 2% of the F2 plants forming heads, of which none were of commercial type and about half bolted as annuals. There was a significant chi square association between biennial habit and tendency for cabbage head formation. Clasping habit of terminal leaves was recessive to open leaves, multigenic, and associated with both cabbage heading and biennial habit.Technical Paper 4836, Oregon Agricultural Experiment Station; from an M.S. thesis by the senior author.
Keywords:Brassica oleracea  quantitative inheritance  vegetable breeding  crucifers
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