Flower-bud formation in turnip varieties

Abstract

The investigations were carried out on the flo-wer-bud formation of 40 varieties of turnip, sown in fall, 1954, and in spring, 1956. The results obtained are summarized as follows. 1. The symptom of flower-bud formation was ob-served 40_??_63 days after sowing in spring planting, and 45_??_66 days after in fall planting, in most of the Japanese varieties of turnip, but in Kokabu and other varieties, which were regarded as Western European group, it took considerably longer time to reach the stage of flower-bud formation than in the Japanese varieties. 2. There was a striking difference in the num-hers of days from planting to flower-bud formation between the Japanese varieties and Kokabu or the Western European group, though there were minor-differences among the Japanese varieties. 3. The authors had classified the turnip varieties, grown in Japan into three group from the view point of morphological characteristics: (1) Japanese: group, (2) Western European group, (3) Intermedi-ate group. Those grouping may be adaptable to the classifi-cation of varieties in relation to the earliness of flower-bud formation to some extent.