Graduate Thesis Or Dissertation

 

Inheritance of internode length, plant form and biennial habit in a cross of cabbage (Brassica oleracea L. Capitata group) x broccoli (Italica group) 公开 Deposited

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  • An inbred cabbage line (Brassica oleracea L. (Capitata group)) and an inbred broccoli line (B. oleracea L. (Italica group)) were crossed. F₁ progeny were vigorous annuals. Of 3,260 F₂ plants, 250 were biennials and 70 developed cabbage heads. Of these 70, 32 were annuals. Days to first visible buds of the annuals and internode length varied continuously and appeared to be controlled by a few genes with modifiers. Both are primarily controlled by additive gene action as shown graphically and by the heritability estimates calculated by Warner's method. Cabbage head forming ability, clasping of leaves and annual-biennial habit also appear to be controlled by a number of genes. Open leaves were dominant over clasped; annual habit was dominant over biennial; and cabbage head forming plants were a minority. Chi square tests showed a highly significant association between cabbage head forming ability and biennial habit. Clasping of leaves, a factor in cabbage heading, was also shown to be associated with biennial habit.
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