Mass selection for bolting resistance in the "Balady" cultivar of cabbage (Brassica oleracea L. var. Capita L.) under high temperature conditions
1989
Damarany, A.M. | Farghaly, M.A. | Hussein, H.A. (Assiut Univ., Assiut (Egypt). Faculty of Agriculture)
Two cycles of mass selection for bolting resistance in the "Balady" cultivar of cabbage (Brassica oleracea L. var. capitata L., 2n=18) were carried out during 1984-1986 seasons. The two cycles of mass selection and the base population were evaluated in the late planting (high temperature conditions) in Upper Egypt (Assiut) during 1986-1988 seasons. In the first cycle (C1) of mass selection, bolting was decreased by 9.92 % relative to the base population. In the second cycle (C2) of mass selection a significant reduction (19.77 %) in the number of plants bolted was found. Date revealed a significant linear regression for bolting resistance through successive generations of mass selection. Similar trend was found for the non-marketable heads (bolters, non-head forming, etc.). Net head weight was slightly decreased by 5.87 and 6.59 % in the C1 and C2 of mass selection, respectively. It might be concluded that a significant response to mass selection after C2 to improve bolting resistance in this cultivar of cabbage could be obtained
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