Shokubutsugaku Zasshi
Online ISSN : 2185-3835
Print ISSN : 0006-808X
ISSN-L : 0006-808X
Volume 66 , Issue 779-780
Showing 1-7 articles out of 7 articles from the selected issue
  • Haruo OKUNO
    1953 Volume 66 Issue 779-780 Pages 121-124
    Published: 1953
    Released: December 05, 2006
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  • Minoru HIRANO
    1953 Volume 66 Issue 779-780 Pages 125-133
    Published: 1953
    Released: December 05, 2006
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  • Syoiti SATO
    1953 Volume 66 Issue 779-780 Pages 135-140
    Published: 1953
    Released: December 05, 2006
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    The structure of spermatozoid of Sargassum Horneri has been studied by means of the electron microscope.
    1. The body of the spermatozoid is too thick for the electron beam penetrance in the light field of the electron microscope. In the image however obtained in the dark field of the electron microscope, a round dense mass conld be seen. This dense mass may be a nuclear portion of the spermatozoid, which is considered also from the data obtained by the cytological nuclear stain reactions.
    2. The two flagella of spermatozoid have a plasmic sheath, and only the front flagellum has natural distinct hairy structures, mastigonemes.
    3. The axis of the flagellum consists of many fine fibrils.
    4. The front and hind flagella are connected with each other at the blepharoplast of the body.
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  • Takasi YAMAZAKI
    1953 Volume 66 Issue 779-780 Pages 141-149
    Published: 1953
    Released: December 05, 2006
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  • Seizi TATUNO
    1953 Volume 66 Issue 779-780 Pages 150-154
    Published: 1953
    Released: December 05, 2006
    JOURNALS FREE ACCESS
    1)Bei zwei diözischen Arten von Catharinaea, eine Gattung von Laubmoos, konnte ich ersten Male die Geschlechtschromosomen entdecken. Ihre Chromosomenformeln und die Karyotypen sind die folgenden:
    Chromosomenformel Karyotyp
    C. undulata {_?? 6+X V(V)+3V+2J+m(h)
    _??_ 6+Y V(Y)+3V+2J+m(h)
    C. gigantean {_?? 6+X V(A)+3V+2J+m(h)
    _??_ 6+Y V(Y)+3V+2J+m(h)
    2) Bei einer monözischen Pflanze von Catharinaea undulata stele ich fest, dass sie triploid mit die Chromosomen n=21=2V(2X)+J(Y)+3(3V+2J+h) ist.
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  • Shogo SAWAMURA
    1953 Volume 66 Issue 779-780 Pages 155-160
    Published: 1953
    Released: December 05, 2006
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    By means of the agar plate method, the action of 2.4-dichlorophenoxyacetic acid sodium, hydrate (hereafter abbreviated 2.4-D)was investigated in the staminal hair cells of Tradescantia reflexa in vivo.
    In the treatment with high concentrations (1-0.5%) of 2.4-D solution, the cells of staminal hairs become gelatinized within 25-60 minutes and later become sol state. Similar solidification of the cell contents would occur also in low concentrations (0.08-0.01%) of 2.4-D solution after survival for weeks and, the cell contents seem to be entirely liquefied. It may be thought that this phenomenon is due to the hydration of the protoplasm caused by the action of 2.4-D sodium salt.
    In the concentrations of less than 0.1% of this drug, some of the hair cells become gelatinized and die in a few days after the treatment, however, during this lapse of days some of them aquire resistancy to the toxicity of the 2.4-D sodium salt and recover their vital forces. These cells then grow unusually containing fully grown plastids and survive a few weeks or more. In the cells with aquired resistancy to the 2.4-D, it is recognized that the cells can make use of this drug as a growth promoting hormone.
    Any concentration of 2.4-D is effective on the mitosis and makes the chromosomes sticky. Consequently this drug can introduce chromosome aberrations, abnormal separation of anaphase chromosomes and secondarily the abnormalities of cell wall formation. Daughter cells with unequal size, micronuclei, imcomplete cell walls and binucleate cells appear in the 2.4-D treatment. Some of these mitotic abnormalities would appear also in the concentrations of 2.4-D solution, in which the resting nuclei can enter into the mitosis de novo.
    It is considered that the specific actions of 2.4-D sodium salt on the mitotic cells may be responsible for its killing effect to the weeds and for the formation of abnormal tissues to the treated plants.
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  • Kyuichi SAKURAI
    1953 Volume 66 Issue 779-780 Pages 161-162
    Published: 1953
    Released: December 05, 2006
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