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Volume 53, Issue 636
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1939 Volume 53 Issue 636 Pages Cover_636-
Published: 1939
Released on J-STAGE: June 15, 2023
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Kono Yasui, Nobuhide Suita1939 Volume 53 Issue 636 Pages 521-524
Published: 1939
Released on J-STAGE: May 24, 2007
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Tadayoshi Tazaki1939 Volume 53 Issue 636 Pages 524-533
Published: 1939
Released on J-STAGE: May 24, 2007
JOURNAL FREE ACCESS1. Calcium concentration of recretion sap was nearly constant in certain range of the concentration of KNOP'S solution. When the nutrient solution became diluted, the calcium concentration in the recretion sap suddenly fell. When the nutrient solution became concentrated, the concentration of calcium in the recretion sap also rised. The calcium concentration in the exudation sap was lower than that of the nutrient solution when the nutrient solution was comparatively concentrated and higher when the nutrient solution was comparatively diluted.
2. The amount of calcium exuded per hour was almost constant in certain range of KNOP'S solution and diminished in the low concentration of calcium in the nutrient solution.
3. The volume of exudation sap per hour was almost constant in certain range of KNOP'S solution and diminished when the nutrient solution was more concentrated than natural KNOP'S solution or more diluted than 1/8-KNOP'S solution.
4. When the nutrient solution was simple KH2PO4 solution, recretion ceased when the solution became more concentrated than 0.075%. As the concentration of salt in KNOP'S solution is much higher than this, it seems that recretion has not necessarily to do with the sum of the concentration of salts in the case of KNOP'S solution.
5. The relation between the potassium concentration in the exudation sap and the nutrient solution showed equal tendency with calcium. But it must be noted that the potassium concentration was higher than that of calcium. The amount of potassium exuded per hour was not constant in some range of KNOP'S solution as calcium, but decreased as the concentration of nutrient solution became diluted. In individual plants, the variation of the concentration of calcium and potassium took equal tendency.
6. In soil-cultured plants, the recretion was more vigorous in comparison with that of the water-cultured plants.
7. From the results obtained in Colocasia, the absorption of salts seems not to take place in epithem.
8. The concentration of calcium and potassium was not always low but often high when the volume of exudation sap was great. So great amount of calcium and potassium was excreted in strong recretion. The subject for investigation was suggested by Prof. Dr. H. NAKANO, to whom I wish to tender my best thanks for his kind directions.View full abstractDownload PDF (808K) -
SHIGEO AKIYAMA1939 Volume 53 Issue 636 Pages 534-540
Published: 1939
Released on J-STAGE: May 24, 2007
JOURNAL FREE ACCESS1. Remarks on the anatomical characteristics of the three species of Carices described in this paper are shown as below.
Carex Rochebruni FRANCH, et SAV.: Upper epidermal cells are large. Protuberances occur in the upper epidermis near the margins. Upper epidermal cells on the nerve are quite similar to those on the mesophyll.
Carex stipata MUEHL.: All epidermal cells are large and have conspicuously wavy cell-walls. Protuberances are found in the upper epidermis on the nerve. Spine cells and protuberances are densely distributed in the margins.
Carex tenuiflora WAHL.: Protuberances are widely distributed in the upper epidermis on the nerve, in all the cells of the under epidermis and in the margins. Subsidiary cells of the stomata are narrow.
2. Nineteen species hitherto described in five papers published presiously to this, and eight species belonging to Canescentes and Macroce- phalae formerly described, belong to the Subgenus Vignea. Those have not the common critical characters in the leaf-structures to authorize their being grouped as a subgenus, and this fact seems to the writer to suggest that the subgenera of the Carices formerly established should be more fully examined.View full abstractDownload PDF (786K) -
YUDZURU OGURA1939 Volume 53 Issue 636 Pages 540-548
Published: 1939
Released on J-STAGE: May 24, 2007
JOURNAL FREE ACCESSThe writer described here some points of the anatomical structure of Acrostichum, speciosum, from the Palao Islands, Micronesia. This fern is very similar to A. aureum and is considered in most cases as to be synonymous with the latter. The anatomy of A. aureum was described by some authors, such as METTENIUS, THOMAS and SCHUMANN, but it is rather curious that the descriptions of these authors did not coincide with each other in some points, for example, in the origin or course of medullary bundles or in the mode of arrangement of vascular bundles in the petiolar base.
According to the present observations of A. speciosum, whose structure is identical with A. aureum, it is very conspicuous that the anatomical structure of this fern is pretty variable. For example, the lower end of the medullary bundle can either originate independently within the pith or from the inner side of the main stele, and its upper end can either fuse with each other or diminish blindly; the mode of arrangement of vascular bundles in the petiolar base is sometimes different not only in different petioles but also even in different levels in one and the same petiole. Therefore, we meet actually with the different cases described by the former authors.
Concerning the stelar system of the stem of Acrostichum, the writer formerly considered it as one of the Cyathea-type of acyclostelic forms, but according to the present observations, especially on the peculiar course of medullary bundles, it should be included in a different type, which may be named as “Acrostichum-type”; concerning its stelar system of the petiole be formerly included it in Saccoloma-type of polystelic forms, but it should be included, according to the present observations, in a different type, which may be named as “Acrostichum-type”.View full abstractDownload PDF (926K) -
I. Colchicine-induced Polyploids of Melandrium albumTOMOWO ONO1939 Volume 53 Issue 636 Pages 549-556
Published: 1939
Released on J-STAGE: May 24, 2007
JOURNAL FREE ACCESS1. A number of male and female tetraploids have been induced in Melandrium album by colchicine method.
2. Conjugations of sex chromosomes at the meiotic divisions in the induced tetraploid males are illustrated in figs. 5 a-f and table 3.
3. The induced tetraploids and normal diploids were intercrossed and a considerable number of seedlings were obtained (table 4). Some of them have been examined cytologically and determined to be triploid (figs. 8-9), tetraploid (fig. 10) or heteroploid (fig. 11).
4. In comparing size relations between the X and the Y chromosomes in somatic cells, it was ascertained that the Y is the larger member of the sex chromosomes.View full abstractDownload PDF (642K) -
1939 Volume 53 Issue 636 Pages 557-564
Published: 1939
Released on J-STAGE: June 15, 2023
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1939 Volume 53 Issue 636 Pages 564-565
Published: 1939
Released on J-STAGE: June 15, 2023
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1939 Volume 53 Issue 636 Pages 565-570
Published: 1939
Released on J-STAGE: June 15, 2023
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1939 Volume 53 Issue 636 Pages App_1-
Published: 1939
Released on J-STAGE: June 15, 2023
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1939 Volume 53 Issue 636 Pages Cover_636b-
Published: 1939
Released on J-STAGE: June 15, 2023
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