The Japanese Journal of Genetics

The genetics of rice. A review

Y. YAMAGUTI

1939 Volume 15 Issue 1 Pages 1-9
Published: 1939
Released on J-STAGE: May 21, 2007

DOIhttps://doi.org/10.1266/jjg.15.1

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Some considerations on the classification of Oryza sativa L. into two subspecies, so-called 'Japonica' and 'Indica'

H. TERAO, U. MIDUSIMA

1939 Volume 15 Issue 1 Pages 10-13
Published: 1939
Released on J-STAGE: May 21, 2007

DOIhttps://doi.org/10.1266/jjg.15.10

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Some considerations on the relation between F₁-sterility and mesoctyl length among Japanese and foreign rice varieties, Oryza satava L

U. MIDUSIMA, T. YAMADA

1939 Volume 15 Issue 1 Pages 14-18
Published: 1939
Released on J-STAGE: May 21, 2007

DOIhttps://doi.org/10.1266/jjg.15.14

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On the heredity of anti-Q-agglutinin

T. FURUHATA

1939 Volume 15 Issue 1 Pages 18-22
Published: 1939
Released on J-STAGE: May 21, 2007

DOIhttps://doi.org/10.1266/jjg.15.18

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Association of chromosomes in Chelidonium majus L

S. NAGAO, K. SAKAI

1939 Volume 15 Issue 1 Pages 23-28
Published: 1939
Released on J-STAGE: May 21, 2007

DOIhttps://doi.org/10.1266/jjg.15.23

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The somatic number of chromosomes in Chelidonium majus is determined to be 10 in root-tip cells. In the somatic nuclear plates the spindle fibre insertion is median in four chromosomes out of the ten and appears to be terminal in the remaining six.
In pollen mother cells, all of the univalent chromosomes, instead of pairing usually shown in late prophase of the first meiotic division, are found attached end-to-end with one another by thin threads to form a closed circle. At diakinesis one nucleolus connects at several regions to the chromosomes, the number of which is commonly six. It is recognized from the relations between nucleolus and chromosomes that there exists some number, possibly six, of satellite or nucleolar chromosomes.
The chromosomes linked together are arranged in the equatorial plane so as to present a zigzag appearance in side view. The mode of disjoining of the chromosomes is, generally speaking, regular, put it into other words the contiguous chromosomes pass to the opposite poles and the alternate ones to the same pole, the number of chromosomes in the daughter nuclei being generally five. In a few cases the numerical distribution is abnormal (cf. Table 1). Not infrequently at anaphase it happens that some of the unit chromosomes lag behind on the equatorial plane, being divided longitudinally.
From the aberration in the meiotic divisions, it is as a natural consequence that there exists in some extents abortive pollen grains and empty seeds. In facts, 68.97% of abortive pollen grains and 71.88% of empty seeds are found (Table 2, 3).

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Selective fertilization in Bombyx mori

S. OMURA

1939 Volume 15 Issue 1 Pages 29-35
Published: 1939
Released on J-STAGE: May 21, 2007

DOIhttps://doi.org/10.1266/jjg.15.29

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When a female of Bombyx mori is mated with two males of different genic constitution one after the other, two different kinds of offspring, corresponding to the paternal characters, are produced. In such a mating, the number of the offspring of the first mated male generally tend to be predominant (Tables 2 and 4b).
The monstrous male having a recessive mutant character, monstrum abdominis, which was obtained by Ômura and Sinohara (1937) (Fig. 1), has shown nothing unusual in fertility when it was ordinarily mated with the female (Table 1). An unexpected result, however, was obtained from a double mating experiment made with this monstrous male and a ordinary male. An extremely low fertility was demonstrated, nearly 0% for the former, even when it was used as the first male in the mating (Table 3). Further data shown in Table 4 indicate decisively that the fertility of the spermatozoa of the monstrous male is extremely reduced when mixed with the spermatozoa of the ordinary strain.
For the explanation of these facts a selective fertilization between the spermatozoa of the monstrous strain and those of the ordinary strain is most likely responsible. Judging from the behavior of the spermatozoa in the female genital organs (Ômura 1938) and from the results shown in Table 4a, it is probable that certain kinds of processes concerning selective fertilization may take place in the egg cell where polyspermy normally occurs (Kawaguchi 1926). Several problems associated with the selective fertilization here concerned are left for further investigation.

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Karyotype analysis and nucleolar chromosomes. A review

D. SATO

1939 Volume 15 Issue 1 Pages 36-43
Published: 1939
Released on J-STAGE: May 21, 2007

DOIhttps://doi.org/10.1266/jjg.15.36

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