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Volume 17 (1941)
- Issue 6 Pages 247-
- Issue 5 Pages 185-
- Issue 4 Pages 135-
- Issue 3 Pages 83-
- Issue 2 Pages 35-
- Issue 1 Pages 1-
Volume 17, Issue 2
Displaying 1-7 of 7 articles from this issue
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Kan-Iti SAKAI1941 Volume 17 Issue 2 Pages 35-40
Published: 1941
Released on J-STAGE: April 04, 2007
JOURNAL FREE ACCESSDiurnal periodicity of somatic mitosis in the root-tips of eleven crop plants were investigated by the writer under the cooperation of seven students of our laboratory. The plants included in this investigation were Ozyza sativa L., Hordeum vulgare L., Triticum vulgare Vill., T. spelta L., T. monococcum L., Secale cereale L., Phaseolus angularis Wight, Ph. vulgaris L., Cannabis sativa L., Solanum tuberosum L. and Vicia Faba L.
The materials were collected from about one-month old plants transplanted into pots from the field one week before the experiment commenced. Root-tips of approximately the same size were fixed at 1- or 2-hour intervals throughout a 24-hour period on June 17-18, 1939. The number of nuclear divisions was counted for each of the samples as to be seen in Tables 1 and 2, and these data produce 11 curves as in Figures I-XI.
It is of interest to note that:
1) Main periods of nuclear division of most plants are a little past 0:30 AM as well as 0:30 PM.
2) Though some differences in the nature of the periodicity-curves are found among the plant materials used, two main dividing periods are distinct in all plants except Vicia.
3) Legumes and potato show a fairly distinct periodicity while hemp and some of the cereals show the secondary dividing periods beside the primary one, the monococcum wheat and rye showing no apparent periodicity.
The data represented in Tables 1 and 2 and in Figures I-XI will be a good help to us in the cytological investigation as well as in the experiment using chemical or physical agents to affect chromosomes or nuclear divisions.View full abstractDownload PDF (631K) -
Hidejiro Niiyama1941 Volume 17 Issue 2 Pages 41-45
Published: 1941
Released on J-STAGE: April 04, 2007
JOURNAL FREE ACCESSDownload PDF (657K) -
Norio KONDO1941 Volume 17 Issue 2 Pages 46-54
Published: 1941
Released on J-STAGE: April 04, 2007
JOURNAL FREE ACCESS1. By colchicine treatment, chromosome numbers have been doubled in 6 diploid species-Secale cereale, Haynaldia villosa, Aegilops bicornis, Ae. comosa, Ae. squarrosa and Ae. uniaristata-and in one sterile species hybrid, Ae. caudata×umbellulata.
2. The germinating seeds, whose coleoptile grown about 2mm long, were removed by a pincette, were immersed in 0.02-0.1% aqueous solution of colchicine for about 24 hours. The dropping method with 0.2% solution was employed to the operated seeds of Ae. squarrosa. For the control Sears' method was used. The results are summarized in Tables 1 and 2.
3. Difference in size between 2x- and 4x-spikes is quite distinct (Figs. 1-2). 4x-plants have gigas habit. Epidermal cell elements of the 4x-leaves become about 11/2 times the length of those of normal plants (Fig. 3). The autotetraploids have more aborted pollen grains than the normals. Good pollen grains of 4x-individuals are larger than those of the diploids (Fig. 4). The sterile hybrid (Ae. Caudata× umbellulata) has exclusively aborted pollen grains, but the amphidiploid has good pollen grains.
4. In most PMCs of S. cereale and H. villosa the chromosome configuration is found to be 1IV+1III+10II+1I and 2IV+10II (Fig. 6). At the first metaphase of PMC 2-5 polyvalents are formed in the autotetraploids of Ae. bicornis, Ae. squarrosa and Ae. uniaristata (Fig. 7; b, d & e). In the amphidiploid 0-2 polyvalents and 0-5 univalents are observed (Fig. 7; f).
5. The fertility of the normals, the autotetraploids and the amphidiploid is shown in Table 3.View full abstractDownload PDF (2017K) -
Eizi HAYAMA1941 Volume 17 Issue 2 Pages 55-57
Published: 1941
Released on J-STAGE: April 04, 2007
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Toshitaro MORINAGA, Tatuhiko TAJIRI1941 Volume 17 Issue 2 Pages 57-62
Published: 1941
Released on J-STAGE: April 04, 2007
JOURNAL FREE ACCESS1. In 1934, one of the authors found a semi-sterile rice plant of 46.9% sterility. The next generation individuals of that plant showed, without exception, a strong tendency of making polycaryopses, the average percentage of sterility being reduced to 12.7%. The character producing polycaryopses bred true for the later generations.
2. The hybrid between the mutant above mentioned and the normal varieties produced normal caryopses. The segregation ratios of the two parental characters actually obtained in the second generation closely approximated in some cases to 3 to 1, but in others they deviated fairly remarkably from that ratio owing probably to the weakness of the mutant type.
3. When two caryopses are found in a spikelet, one is situated on the side of lemma, while the other is on the side of palea. In unhulled condition, the caryopsis on the lemma side germinates normally, but the one on the side of palea does not, or take very long time for germination.
4. The portion of the lemma against the embryo of the normal caryopsis has a special nature and construction to be split easily by the swelling pressure of the embryo. No such a structure is found at the base of the palea. Germination of the palea side caryopsis is possible only through that germination part of the lemma or through between the lemma and palea.View full abstractDownload PDF (1015K) -
Akira MORIYA1941 Volume 17 Issue 2 Pages 62-64
Published: 1941
Released on J-STAGE: April 04, 2007
JOURNAL FREE ACCESSChromosome numbers of 5 sugarcane varieties were here reported preliminarily. The materials and results are shown in the following table.View full abstractDownload PDF (308K) -
Taku KOMAI1941 Volume 17 Issue 2 Pages 65-81
Published: 1941
Released on J-STAGE: April 04, 2007
JOURNAL FREE ACCESSDownload PDF (2311K)
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