コスモスにおける丁字型八重咲性の性状とその採種法に関する研究

概要

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It is commonly known already a strain of the crested double flowering cosmos produces 0 to 60% double flowering plants in its seedlings usually. These crested-double flowers, however, are not always of perfectly fine full-doubled (DDD-typed, signed temporarily) but of imperfect serni-(DD-typed) or slightly-doubled (D-typed) in some considerable d'efinite ratio. Furthermore, in a few cases come out the ball-shaped or aster-1ike double flowers (DDDD- typed) on the slender and much branched plants, alike some plants with the fluted (F-typed), tubulared single (T-typed) or non-petaled (N-typed) flowers. Seeds obtained from the full-doubled DDD-mother plants pollinated artificially with slightly-doubled (D) pollen segregate about 68%: double flowering., and those fertilized naturally (possibly with many pollen of single-flowering (S) and partly of slightly-doubled (D-DD)) produce about ' 50 or more % of doubleflowering seedlings in the next generation. And seeds from the imperfect semi- or slightly.-doubled plants pollinated naturally give only 14 to 47% (in 1953-!54) of double flowerin.g. Still more, it is observed freqtiently that the fluted doubled and tubulared singled flowers are found in the seedlings derived from the normal cres~ed doubled plants.
日本育種学会の論文
1955-07-05