八重咲コスモスの人為的一重化とくに採種上の一方法として
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概要
- 論文の詳細を見る
Artificial Flower Type Transformation from Double to Single in Cosmos bipinnatus CAV. as Related to Production of High Double-Yielding Seeds. R. Iwasa and K. Shinoda. Faculty of Horticulture, Chiba University, Matsudo, Japan. Tech. Bull. Fac. Hort. Chiba Univ., No.15: 27〜32, 1967. According to SAMATA's reports (1959-b, etc.) double flowered cosmos can be transformed to single-flowered type when grown in a high temperature biotrone chamber at 30℃. Sometimes, however, in the garden, we can find double flowering cosmos plants with both normal double and partly-doubled flowers having fertile stamens. When examining these individual double plants closely, it was found that there were various types of flowers ranging from anemone, crown to pompon forms. In October, 1961, under natural conditions, these various forms of doubles on a plant, except a pompon type (DD), were obtained by promoting the growth of dormant buds near the base of plants with the methods of laying down the main stems and pinching which were practiced in mid-August. This was made in the hope of obtaining high double-yielding plants by crossing of double flowers (Dd+MD_1, MD_2, and so on) with the transformed single-one in the phenotype and doubles in genotype (Dd), and this would be useful from the standpoint of commercial seed production of double cosmos. In this study, of interest was the observation that in some clonal strains, each of branches within a plant had different types of flowers, except a pompon form. Another point of interest to note was that the flower type variation was accompanied by variation of leaf type from coarse (double flowers) to fine (single) pinnate leaves within a plant.
- 千葉大学の論文
- 1967-12-31