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• W4242893943 abstract "All young plants which were treated with a definite concentration of gibberellin grow taller and slender abnormally. In order to dissolve this phenomenon, the physiological actions of gibberellin were examined, firstly, comparing with those of plant growth hormenes such as. heteroauxin. The gibberellin used in all experiments of this paper. is a crystalline gibberellin A, d. p. 242-4°. It was identified that there were a big difference in the mode of action between gibberellin and auxins by the following experiments. (1) It did not induce the cell division of callus of Bryopl.llum and, also, the callus formation of soy bean, sunflower and tomato. (2) It did not suppress the fomation of lateral buds in kidneybean and etiolated pea. (3) It did not induce the epinacy of tomato. (4) It was found to be entirely inactive in. the avena standard and pea tests. (5) It had been reported in the previous paper that it had hindered the growth of roots of rice seedlings, but it was found to have no such effect as promoting or hindering on the development and the branching of avena roots in an extent of concentrations of 0.02_??_10mg/1. Secondly, the cells of stamen hairs of Tradescantia r_??_flexa were cultured in the agar plate containing 2% of saccharose and various concentrations of gibberellin to observe the mitosis of cells and the elongation and enlargement growths of devided cells. The results were as. follows: (1) The gibberellin was found to be hardly recognizable as a promoting substance for mitosis, but it never hindered the occurance of mitosis even in such a high concentration of 0.01% as to make the rice seedlings dead. This fact shows that gibberellin is a kind of plant hormone, but not a poisonous substance against protoplasma. (2) It was certainly and clearly observed that its effect on elongation growth appeared more remarkably on the embryonal cells than the adults and, also, more at the basic part. than the front part in each cell under the concentration of 0.0005_??_0.00001%, resulting in the formation of the cells shaped in bottle-like pattern. From this former fact and the fact thatt the growth of cell membrane in the tissue occured even in the youngest cells immediately after their division which did not yet form the chlorephyll, it is confirmed cytologically that the physiological action of gibberellin is quite indifferent from the assimilation of chlorophyll. Concerning the rerson of the latter fact, the following affairs are assumed: One stamen hair is composed of cells standing in only one, line and each cell contacts each other only with septum. Therefore, the membrane of each cell is able to make freely its elongation growth as well as its enlargement growth besides this contacting portion. In spite of this freedom, the fact that the basic part of each cell makes, especially, more enlargement growth than the front part resulting in the bottle-like shape, is considered to be the cellulose micells are accumulated too much in the basic part. The similar phenomena to this fact, are observed in the stem growth of monocotyledon, i.e., the stem growth depends on the reproduction-of young tissue located just in upper part of each bode. It is considered that there is such a polarity, also, even in each cell. But, in the case of the divided tissue in plant body, thee enlargement growth is limited in some extent than the elongation growth by the resistance between each tissue and, as the result, each cell is obliged to make only the elongation, growth showing the characteristic abnormal phenomenon. Thirdly, the percentages of elongation growth and of reproduction were examined quanti-tatively using soybean, sunflower, tomato and lemon as the testing plants." @default.
• W4242893943 created "2022-05-12" @default.
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• W4242893943 date "1952-01-01" @default.
• W4242893943 modified "2023-10-16" @default.
• W4242893943 title "The Biochemistry of Bakanae Fungus" @default.
• W4242893943 doi "https://doi.org/10.1271/nogeikagaku1924.26.393" @default.
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