The Japanese Journal of Genetics

ON THE OCCURRENCE OF YELLOW SEEDLINGS IN A VARIEGATED STRAIN OF RICE

Yoshiwo KATAYAMA, Shojiro SHIDA

1956 Volume 31 Issue 5 Pages 131-136
Published: 1956
Released on J-STAGE: May 21, 2007

DOIhttps://doi.org/10.1266/jjg.31.131

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KARYOTAXONOMIC STUDIES IN TRIBE TUBULIFLORAE OF COMPOSITAE

I. THE KARYOTYPE ANALYSIS AND ITS PHYLOGENIC CONSIDERATION IN SUBTRIBE GNAPHALIINEAE

Hisao ARANO

1956 Volume 31 Issue 5 Pages 137-143
Published: 1956
Released on J-STAGE: May 21, 2007

DOIhttps://doi.org/10.1266/jjg.31.137

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(1) The taxonomic problem of the subtribe Gnaphallineae was considered.
(2) The genera Gnaphalium, Anaphalis and Leontopodium were discussed from a karyotaxonomic stand point.
(3) In several species, seed fertility can be explained by their karyotypic peculiarities.
(4) A. pterocaulon Maxim or A. todaiensis Honda or A. sinica Hance shows a specific constitution of the karyotype different from all the rest of subtribe Gnaphallineae.

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EYE-COLOUR GENES AND TUMOR INCIDENCE

Takeharu KANEHISA

1956 Volume 31 Issue 5 Pages 144-146
Published: 1956
Released on J-STAGE: May 21, 2007

DOIhttps://doi.org/10.1266/jjg.31.144

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1. From the original tumor strain, or bw tu, a strain having only the tumor gene, or tu (53 d), was isolated. Various eye-colour strains were mated with tu (53d). From the offspring of these matings the following tumor strains were newly estabiished: bw tu, v tu, cn tu, v bw tu, tu st, and bw tu st. The incidence of tumor in each strain was studied.
2. The results show that the incidence of tumor increases when the tumor gene is accompanied by the eye-colour gene. According to the rate of increase in the incidence of tumor, newly established strains are arranged in a line as follows: tu, bw tu, v tu, cn tu, v bw tu, tu st, and bw tu st.
3. Eye-colours of these eye-colour mutants are considered to be regulated by the tryptophane metabolism in the development of Drosophila. It is, therefore, assumed that the incidence of tumor has a certain close connection with the tryptophane metabolic system.

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ON THE RELATION BETWEEN THE CHROMOSOME NUMBERS AND THE FLORA GROWING IN THE COAST OF THE INLAND SEA IN JAPAN

Taro JINNO

1956 Volume 31 Issue 5 Pages 147-150
Published: 1956
Released on J-STAGE: May 21, 2007

DOIhttps://doi.org/10.1266/jjg.31.147

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La structure submicroscopique de la queue des spermatozoïdes

Gonpachiro YASUZUMI, Ichiro WAKISAKA

1956 Volume 31 Issue 5 Pages 151-154
Published: 1956
Released on J-STAGE: May 21, 2007

DOIhttps://doi.org/10.1266/jjg.31.151

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La fibre axiale de la queue des spermatozoïdes est composée d'une couroune de 9 fibrilles optiquement denses et d'un faisceau central a structure moins dense. Ce dernier est luimême constitué par 9 filaments disposés autour d'une paire des filaments axial. La pièce intermédiaire du spermatozoïde est enveloppée par une gaine tubulaire ä structure hélicoidale tandis que la tête est entourée par les spires d'une fibre rubanée et à l'exterieur de celle-ci, par une fine membrane continue.

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Cytogenetic studies in Nicotiana

XIV. Reduction divisions in five interspecific hybrids

Yo TAKENAKA

1956 Volume 31 Issue 5 Pages 155-161
Published: 1956
Released on J-STAGE: May 21, 2007

DOIhttps://doi.org/10.1266/jjg.31.155

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1) At MI in PMC's of F₁ N. sylvestris (n=12)×N. otophora (n=12), a pairing range 0-5 was found with mode at 2-3. In the same hybrid Goodspeed (1954) observed 0-7 bivalents with mode at 3.
2) At MI in PMC's of F₁ N. sylvestris (n=12)×N. tomentosa (n=12), 0-7 bivalents were found with mode at 3. Goodspeed (1954) found pairing ranges of 0-7 with mode at 3 and 0-7 with mode at 2-3 respectively in F₁ N. sylvestris×N. setchellii and F₁ N. sylvestris× N. tomentosa. Kostoff (1943) found, in F₁ N. sylvestris×N. tomentosa, usually univalents or 1 to 4 bivalents and rarely more than 4 bivalents. He also observed, in F₁ N. sylvestris×N. tomentosiformis, somewhat less bivalents than in the former. The writer (1955) found 1-9 bivalents with mode at 4 in F₁ N. sylvestris×N. tomentosiformis. From the results mentioned above, we can assume 2-4 homologous chromosomes or large homologous portions between sylvestris genome and the genomes of the tomentosa group.
3) At MI in PMC's of F₁ N. tabacum (n=24)×N. solanifolia (n=12), a pairing range 1-5 was found with mode at 1. Goodspeed also found 0-7 bivalents with mode at 2. Accordingly the conjugational affinity between tabacum and solanifolia genomes is assumed to be generally the same as the intragenomatic affinity in N. tabacum.
4) At MI of PMC's of F₁ N. Debneyi (n=24)×N. tabacum (n=24), 0-6 bivalents were found with mode at 2. Kostoff also found usually univalents or 1-3 bivalents. From these results it appears that there may be no pairing between tabacum and Debneyi genomes, since a few intragenomatic affinities in N. tabacum are present.
5) At MI of PMC's of the hybrid N. rustica×N. paniculata, the writer observed a univalent range 2-12, a bivalent range 2-12 and a trivalent range 0-10. In the same hybrid, Goodspeed found usually 12 bivalents and occasionaly 1 trivalent or rarely 2 trivalents. Kostoff also found usually 12 bivalents and 12 univalents, and rarely 1 trivalent. The writer observed more trivalents, but N. paniculata is recognized to be one of the ancestors of N. rustica.

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