1926 Volume 40 Issue 473 Pages 281-294
Among the various plants, we find the race with the fasciated stem. The fasciation of plants is able to classify two groups-the inborn and the acquired-, on account of the origin of its appearance.
The fasciation in this plants belongs to the former group. Then the plant bearing this character breeds true to this character at the next generation.
The morphological and physiological study of the character in this plant was carried through the water culture and the microscopic treatment by Mr. Y. Yamaguchi in 1916.
The genetic study of the character in this plant was reported pieliminarily by the author in 1923. By the raising of the further generation in 1924, the author have been able to prove the evidence for my opinion in the preliminary reports-that the fasciation is constituted geneticaly by the cooperation of two recessive factors, the one of these factors designated as p for“Kudyakuba”(i.e. the leaf-294 THE shape gene) the other factor f′ having activity to fasciate the normal stem only when it presents in the same germ-cell with the recessive gene (p).
Considering Mr. Yamaguchi′s conclution that the suitable density of the Knop′s solution for the developing of this character is 5%, the author can take such a explanation that the favorable density to develop the activity of these genes is 5%.
A few normal individuals among the offsprings of the fasciated parent may be not owing to the result of such the external influence, but their origin to the factor-transformation as followings: p→P, f→F.