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Volume 8 (1932 - 1933･･･
- Issue 4 Pages 197-
- Issue 2-3 Pages 65-
- Issue 1 Pages 1-
Volume 8, Issue 2-3
Displaying 1-10 of 10 articles from this issue
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H. S. JENNINGS1933 Volume 8 Issue 2-3 Pages 65-84
Published: 1933
Released on J-STAGE: November 30, 2007
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Hisajiro TANAKA1933 Volume 8 Issue 2-3 Pages 85-96
Published: 1933
Released on J-STAGE: November 30, 2007
JOURNAL FREE ACCESS1. A number of varieties of Nicotiana Tabacum, which were long cultivated in Japan, was examined karyologically. The gametic number of chromosomes found in these varieties were 24, except only a variety of“Okusa-ha”.
2. As the behaviour of chromosomes in the meiotic phase of the variety“Okusa-ha”was somewhat irregular, that determination of the exact number of chromosomes was difficult. Most of the pollen mother cells had 24 gametic number of chromosomes, while in some of the pollen mother cells an abnormal number of chromosomal elements was found, as for instance, 30, 36, 42, 48, etc.
3. “Hatano-ha”, a mutant of N. Tabacum var. petiolata, is characteristic in the increased number of leaves. But in this experiment the chromosome number of mutant was n=24 and their behaviour in division were the same with those of the original forms.
4. In pollen mother cells of N. glauca, a newly introduced form, 12 gametic chromosomes were counted, which confirms the result obtained in the same species by GOODSPEED.
5. The pollen mother cells of the F1 plants of N. Tabacum var. petiolata, “Ibusuki-ha”(n=24)× N. glauca (n=12) contained both univalent and bivalent chromosomes in the meiotic stage. The number of the bivalent chromosomes varies from one to twelve. The method of syndesis seems to be allosyndetic. The behaviour of chromosomes in meiotic division was irregular.
6. The hybrid above mentioned is self-sterile. But a few nonviable seeds were obtained in the case of F1×N. glauca, although no seed was obtained in the reciprocal cross.View full abstractDownload PDF (1634K) -
Eisaku KAWAGUCHI1933 Volume 8 Issue 2-3 Pages 97-106
Published: 1933
Released on J-STAGE: November 30, 2007
JOURNAL FREE ACCESS1) Beim Züchten der Seidenspinner-Rasse“Nikka”, die homozygot für die Gene, p und y1) ist, fand M. SAKAI, ein Seidenspinnerzüchter, im Oktober 1931 einige Raupen beiderlei Geschlechts (3 _??__??_, 3 _??__??_), die als Merkmal eine besonders schwarze Zeichnung aufwiesen. Nach seiner Beobachtung wurden bis jetzt seit mehreren Züchtungsgenerationen keine solcher Raupen gefunden. Der mutierte Charakter, der neu gefunden wurde, sieht den beiden Typen“Moricaud”und“Striped”, die auch schwarze Merkmale aufweisen, etwas ähnlich, aber unterscheidet sich durch folgende Abweichungen: die Körperfarbe, besonders der Bauchseite, ist viel dunkler als die von Moricaud2), aber nicht gestreift wie die von Striped3): und die schwarzen gestreiften Flecken (“Adfrontal Spot”) an den Parietalplatten sind vorhanden wie beim Moricaud-Typus, wurden aber vom Striped-Typus und anderen Seidenspinnertypen nicht auf-gewiesen (Abb. I und II).View full abstractDownload PDF (767K) -
IV. FURTHER STUDIES ON FATUOID OATSIchizo NISHIYAMA1933 Volume 8 Issue 2-3 Pages 107-124
Published: 1933
Released on J-STAGE: November 30, 2007
JOURNAL FREE ACCESSThe segregation ratio of heterozygous fatuoids with 20II+c, type b in the II-series, is found to be very variable, correlating with their different fertility (Tables 1 and 2). Dwarf homozygous fatuoids having 40 chromosomes (2n-2c), where the synapsis usually fails, are produced in a high proportion with the increase of the fertility of the parents, while, on the contrary, heterozygous fatuoids (20II+c) are found in less frequency. Notwithstanding the variation of fertility normal plants (20II+cc) are obtained almost in the same proportion (2.38-3.86%). Besides, in rare cases heterozygous fatuoids produce some aberrant segregates with exceptional chromosome combinations, which contain one or two of the segments, s1 and s2 of the c-chromosome.
(1). A few of homozygous fatuoids are found to have 20II+s1 and 20II+s1s1. They are dwarf and highly sterile, looking like those with 40 chromosomes (2n-2c).
(2). The somatic chromosome number of semi-dwarf and highly sterile heterozygous fatuoids is clearly counted to be 40+s2, in which the chromosome conjugation is usually lacking.
(3). A heterozygous fatuoids with 20II+cs1 is obtained in the progeny of homozygous fatuoid (20II+s1)×normal plant (20II+cc), with those having 20II+c.
From the correlation between the chromosome combination and morphological characters of these plants given above, the author has reached the conclusion that the genes for the cultivated type of the grain are carried in the shorter arm of the c-chromosome, s2 and a gene or genes for the synapsis in its longer arm, s1.View full abstractDownload PDF (1228K) -
YUKIO YAMAMOTO1933 Volume 8 Issue 2-3 Pages 125-130
Published: 1933
Released on J-STAGE: November 30, 2007
JOURNAL FREE ACCESSIn 1931 an autohexaploid plant was obtained in the progenies of a triploid intersex (22=2X+1Y1+1Y2+18a Fig. 1) of Rumex Acetosa.
The chromosomal formula of this plant is:
6n 44=4X+2Y1+2Y2+36a (Fig. 4) X:A=4:6
In the heterotypic metaphase of PMC of the tripolid mother plant, the author observed sometimes nuclear plates with unreduced chromosome number (22I=2X+1Y1+1Y2+18a Fig. 2). Restitution nuclei were also often observed (Fig. 3). This plant might have been arisen by the conjugation of unreduced male and female gametes which are derived by the abnormality in the reduction division of the mother plant.
The plant was very weak and not yet gave inflorescence.View full abstractDownload PDF (208K) -
H. MORI1933 Volume 8 Issue 2-3 Pages 131-136
Published: 1933
Released on J-STAGE: November 30, 2007
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Sukeichi FUJII1933 Volume 8 Issue 2-3 Pages 137-149
Published: 1933
Released on J-STAGE: November 30, 2007
JOURNAL FREE ACCESS(1) It has been proved by this experiment that there exists a regionally differential susceptibility to X rays in the first chromosome of Drosophila virilis.
(2) X-raying causes a decrease in the amount of crossing-over in the distal region and an increase in the proximal region; the middle region remains unaffected.
(3) The effect of X-raying seems to appear first on the sixth day, and attains the climax between the seventh and ninth day and disappears between the sixteenth and eighteenth day.View full abstractDownload PDF (529K) -
Hideo KIKKAWA1933 Volume 8 Issue 2-3 Pages 150-164
Published: 1933
Released on J-STAGE: November 30, 2007
JOURNAL FREE ACCESS(1) One translocation line was discovered in the natural state. It may be explained as due to the transference of a small piece of the left end of the third chromosome to the right of the fourth chromosome.
(2) The classes derived from the translocation line show the characteristics as given in the accompanying table. (N=normal chromosome, T3=third chromosome with translocation, T4=fourth chromosome with translocation.)
Genotypic constitution Appearance Viability Fertility
N/N, N/N Normal 100 High
N/T3, N/T4 Normal 100 High
N/T3, N/N Diminutive flies 3 Very low
N/N, N/T4 Slender than normal in appearance 84 High
T3/T3, N/T4 Diminutive flies with scoop bristles 3 Very low
T3/T3, T4/T4 - Dies -
T3/T3, N/N - " -
N/T3, T4/T4 - " -
N/N, T4/T4 - " -
(3) This translocation line reveals that the duplication and the deficiency of a small piece of the chromosome give rise to deviations in opposite directions in respect to various points of the external feature from the normal state.
(4) The appearance of two mutations, the scoop gene and a lethal gene, seems to indicate that the natural mutations are also likely to be associated with the loci of the breakages in translocations.View full abstractDownload PDF (598K) -
B. KANNA1933 Volume 8 Issue 2-3 Pages 165-178
Published: 1933
Released on J-STAGE: November 30, 2007
JOURNAL FREE ACCESSStudying the flower colours of Mirabilis Jalapa, with special reference to its striped flowers, the writer detected two sets of multiple allelomorphs, including mutable genes. The various combinations of these six genes result in different flower colours, with or without variegation of deeper colours. The mutability in the striped flowers is variable by the presence of a modifier or modifiers.
Three types of bud variations, due to somatic mutations, are observed and discussed their chimerical nature.
The directions of mutation in the allelomorphs are also studied.View full abstractDownload PDF (607K) -
[in Japanese]1933 Volume 8 Issue 2-3 Pages 179-193
Published: 1933
Released on J-STAGE: November 30, 2007
JOURNAL FREE ACCESSDownload PDF (861K)
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