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Volume 8 (1932 - 1933･･･
- Issue 4 Pages 197-
- Issue 2-3 Pages 65-
- Issue 1 Pages 1-
Volume 8, Issue 1
Displaying 1-5 of 5 articles from this issue
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Masaharu TANGE1932 Volume 8 Issue 1 Pages 1-18
Published: 1932
Released on J-STAGE: November 30, 2007
JOURNAL FREE ACCESS1. Seven albino individuals occurred unexpectedly in the offspring of blond ring-doves, which the writer has reared being convinced to be genetically pure, the first albino hatched in November 1930, and the last one in July 1931. The albino individuals are of same size as the blond ring-doves or the white ones, of snow-white plumage, and with pink eyes; they differ from white ring-doves in colour, which have dark eyes and are white in plumage, but have very light cream-coloured neck-mark and light grey spotted tail-feathers. (Plate 1).View full abstractDownload PDF (3063K) -
Makoto SISA1932 Volume 8 Issue 1 Pages 19-26
Published: 1932
Released on J-STAGE: November 30, 2007
JOURNAL FREE ACCESSOf three species of cultivated cucurbits viz. Cucurbita Pepo Linn., C. maxima Duchesne, and C. moschata Duchesne, the last is the most popularly grown throughout Japan. Cultivation of the other two species is rather limited to the northern part. As the blooming period of C. moschata falls in the rainy season in the main growing districts in this country, very poor setting of fruit occasionally results. Accordingly artificial pollination is often of practical importance, and successful pollination is held to be secured only in the earlier part of the day.
In connexion with this point, germination tests of pollen at various ages of the flower have been made with different cultural varieties belonging to the respective species as given below.
Cucurbita maxima: Hubbard, Delicious.
C. moschata: Shishigatani, Chirimen, Bizen-ko-kabocha.
C. Pepo: Sômen, Pumpkin.
An appropriate medium for the pollen of C. moschata and C. maxima was prepared from 1.5 per cent agar-agar dissolved in a 50/100M solution of sucrose by boiling, its hydrogen-ion concentration being adjusted to pH 5.5. For C. Pepo, a medium of 6 per cent gelatine in 45/100M sucrose solution adjusted to pH 5.9 was the best.
The rate of germination tested in the afternoon was generally higher with the pollen of a flower-bud which was ready to open the next day than with that of an open flower. In the case of Shishigatani variety, the percentage of germination with pollen taken out from the flower-buds increased gradually with the lapse of time from morning till 9p.m. on the day before anthesis; it decreased slowly up to the blooming time early the next morning and then rapidly until 10a.m. of the same day. Pollen of Chirimen variety sustained its high germinative power during the forenoon after anthesis, but the reduction of its viability in the afternoon was prompt. From these features in C. maschata, the empirical rule that the pollination has to be done early in the morning seems reasonable. If the artificial pollination must be postponed to the afternoon, a satisfactory setting may be expected by pollination with the pollen of buds which are due to open the next day.
In the pollen of Hubbard, a high rate of germination was proved up to the evening after blooming. This agrees with BUSHNELL'S conclusion that successful pollination is possible at any time of the day.View full abstractDownload PDF (372K) -
Kengo YAMAMOTO, Kan-ichi SAKAI1932 Volume 8 Issue 1 Pages 27-33
Published: 1932
Released on J-STAGE: November 30, 2007
JOURNAL FREE ACCESSDownload PDF (190K) -
Mikio MORIYA1932 Volume 8 Issue 1 Pages 34-48
Published: 1932
Released on J-STAGE: November 30, 2007
JOURNAL FREE ACCESSDer 34-chromosomige Bastard entstand aus der Kreuzung eines 40-chromosomigen Zwerges (D-2g; Abb. 1) mit Triticum polonicum (Abb. 2). In der I. Metaphase dieser Pflanze ist die Chromosomenkombination 14II+6I festgestellt worden (in PMZ; Abb. 3-5). Die beiden meiotischen Teilungen gestalten sich ebenso wie bei pentaploiden Triticum-Bastarden mit 14II+7I. Es waren also 14-bis 20-chromosomige Gameten und dem-entsprechend in der Nachkommenschaft 28-bis 40-chromosomige Individuen möglich.
Die Nachkommenschaft ist bei Isolierung gewonnen worden; die Fruchtbarkeit des Bastards betrug unter diesen Umständen 31 Körner pro 100 Blütchen (1. und 2. Blütchen), also 31%. Von den geernteten Körnern haben 75, 5% gekeimt. Bei 87 Individuen aus dieser F2-Nachkom-menschaft sind die Chromosomenzahlen in der I. Metaphase festgestellt worden. Aus Tab. 1 sind die verschiedenen Chromosomenkombinationen und ihre Häufigkeit zu ersehen (Abb. 6-23). Bei 60 (ca, 69%) Pflanzen sind“fertile, ”bei den 27 (ca. 31%) übrigen“sterile”Chromosomenkombinationen-gefunden worden. Der Ausgangsbastard gehört nach KIHARA (1924) zur Verminderungsgruppe, die im Laufe der Zeit zur Chromosomenzahl 28 zurückkehrt. Diese Tendenz macht sich auch hier, wie aus den obigen Zahlen hervorgeht, bemerkbar, nur dass die Erreichung dieser Zahl etwas langsamer (als bei den von KIHARA untersuchten pentaploiden Bastarden) vor sich geht, angesichts dessen, dass unter den günstigen Bedingungen in Kyoto auffallend mehr“sterile”Chromosomenkombinationen realisiert werden als in Sapporo.
Es wurden ferner die Beziehungen zwischen Fertilität und Chromosomenkombinationen bei dieser Nachkommenschaft näher untersucht. Es hat sich gezeigt, dass die Fruchtbarkeit der“fertilen”Kombinationen mit der Verminderung der Univalentenanzahl steigt. Bei“sterilen”Kombinationen konnten keine regelmässigen Beziehungen zwischen den genannten Faktoren gefunden werden. Aus Tab. 3 sind die Fertilitäts- und die Wuchsverhältnisse (Höhe) der untersuchten Pflanzen zu ersehen.
Ein Individuum mit 15II wurde gefunden. Es war zwergig und gänzlich steril (Taf. II).View full abstractDownload PDF (1153K) -
Y. TAKEZAKI1932 Volume 8 Issue 1 Pages 49-63
Published: 1932
Released on J-STAGE: November 30, 2007
JOURNAL FREE ACCESS1. Four different types are reported in the present paper on the laxness of panicle in rice.
2. The dencity of grain on panicle is defined here as the number of spikelets (or grains) per cm. length of panicle.
3. The laxness of panicle is classified into four types according to the value of dencity of grain as;
M±δ spikelets in cm.
I normal type (I0) 4.81 0.63
II lax I type (II) 2.19 0.42
III lax II type (I2) 1-43 0.25
IV lax III type (I3) 0.18 0.10
4. Two pairs of allelomorph (Ka and Kb) are proposed as the results of gametic analysis for the laxness factors by crossing different types.
5. Hence, the relations between the phenotypes and the genotypes of the panicle are as follows.
I normal type (I0) …… KaKaKbKb..
II lax I type (I1) ……KaKaKbKb.
III lax II type (I2) ……KaKaKbKb.
IV lax III type (I3) ……KaKaKbKb.
6. Concerning to the lax panicled varieties, the author has noticed only two lax types beside normal one in his collection of more than thausand Japanese common varieties. Two lax types are one variety of the lax I type (viz. HL) and two varieties of lax II type (viz. “Higeyori-hen” and “So-dairyu”).
7. The lax III type has never been found before, but this was newly generated by the crossing between the lax I and the lax II (viz. “HL”דHigeyori-hen”), and the type kept breed true since it was originated and this strain is called as a new variety LLL in the author's collection.View full abstractDownload PDF (873K)
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