棉蕾〓の発育時期と落蕾〓との関係について
スポンサーリンク
概要
- 論文の詳細を見る
Inducing bud- and boll-shedding in Asiatic cotton plants by shading (dark) treatment and drought treatment for 2 or 3 days, we studied how the bud- and boll-shedding depended upon the stage of their fruiting processes, and also we examined the relations between the development of abscission layer and the concurrent damage to floral organs. Under both conditions of treatments young squares seldom shed, and the rates of shedding begin to increase after the starting of microsporogenesis. Under the light deficient conditioo, the peak of shedding rate takes place from the beginning of macrosporogenesis to the end of nuclear divisions in embryo sac, accompanying chiefly with the damages of the megaspore mother cell or of the female gamatephyte. The rate of shedding decreases in old squares, a few days before flowering, but almost of them shed after flowering, accompanied with the damages of the egg cell or of the developing embryo. Under water deficient condition, the peak of shedding takes place during before and after megasporogenesis, accompanying chiefly with dissolution of the cells surrounding the megaspore mother cell. Comparing the effects of these two conditions, we could find a tendency that squares were very sensitive to drought condition while bolls were rather sensitive to light deficient condition. Concerning the boll shedding, it seems probable that the damages of the egg or young embryo are the main cause which induces stimulus to abscission. The rare shedding with the increasing age of the bolls seems to be due to the development of the embryo and endosperm, and also to the strengthening of the mechanical tissues of the pedicel. Evidence is presented which indicates that under shedding condition the absciss layer begins to develop a little later after the occurrence of damage of the megaspore mother cell or of the female gamatephyte, while under drought condition the development of the absciss layer is so rapidly induced, that it seems probable that loss of water from the pedicel tissue might directly serve as a stimulus to abscission.
- 日本作物学会の論文
- 1951-12-30