Inheritance and commercial value of interspecific hybrids between Brassica rapa (AA) and B. oleracea (CC) for edible flower stem
2002
Zhang, B. (Ehime Univ., Matsuyama (Japan). Coll. of Agriculture) | Kakihara, F. | Kato, M.
Seed fertility, growth period, yield and other characters were investigated in amphidiploid lines and sesquidiploid lines derived from Brassica rapa (2n= 20 AA) and B. oleracea (2n= 18 CC)for edible flower stem, and the possibility of breeding a commercial variety with edible flower stem is discussed in this study. Seed fertility was still low in amphidiploid lines, however, some lines with high seed fertility and self-incompatibility were obtained, which can be used as parents in the further breeding of hybrids. Seed fertility in backcross of amphidiploid lines with A genome lines was higher than that in the self-pollination of arrLphidiploid lines. It was considered that sesquidiploid lines possess greater commercial value than amphidiploid lines. Although amphidiploid lines and sesquidiploid lines expressed a late mature character compared with their diploid lines, early and medium mature lines were obtained by using A and C genome lines with short growth duration as parents. Some amphidiploid lines and sesquidiploid lines showed strong heterosis, especially in the total plant weight, but the edible proportion of these plant was lower than that of their parents. Sesquidiploid lines were smaller in plant size, and were more suitable to high density planting than amphidiploid lines. Unit yield of the flower stem and edible proportion rate of sesquidiploid lines increased when they were grown at the optimal density. It is possible to obtain commercially valuable varieties of amphidiploid lines or sesquidiploid lines using pure amphidiploid lines selected in seed fertility, growth period, yield and other characters as the parents.
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