All issues
Successor
Volume 4 (1927 - 1929･･･
- Issue 4 Pages 187-
- Issue 3 Pages 113-
- Issue 2 Pages 55-
- Issue 1 Pages 1-
Volume 4, Issue 4
Displaying 1-4 of 4 articles from this issue
- |<
- <
- 1
- >
- >|
-
SHUN-JIRO WAKAKUWA1929 Volume 4 Issue 4 Pages 187-197
Published: 1929
Released on J-STAGE: November 30, 2007
JOURNAL FREE ACCESS1. In the F1-hybrids between two dwarf plants D-2f (20II=19II+gg) and D-2g (19II+ff) there are 19 bivalents and 2 univalents (f+g) in the heterotypic division. The 19 bivalents divide in the usual manner and behave quite normally througout both divisions. At the time of heterotypic division the 2 univalents divide equationally and pass to each pole, but in the homeotypic division the 2 halves of univalents pass at random to either pole without division. As the result the gametic chromosome number varies from 19 to 21.
2. It is therefore theoretically expected, and experimentally proved that the chromosome numbers and the combination in F2 are 19II+0I, 19II+1I, 20II+0I, 19II +2I, 20II+1I and 21II+0I (TableII).
3. In the offspring of 39-chromosome plant (19II+1I), individuals with the chromosome combination 19II+0I, 19II+1I or 20II+0I are found. Therefore, the pollen grains having 19- and 20-chromosomes must be effective.
4. All offspring from the plant with 19II+f have no g-chromosome and the offspring from the plant with 19II+g lack f-chromosome. The former shows a higher degree of sterility than the latter. Therefore, we may conclude that the degree of sterility is not only due to the chromosome combination but also to the difference of the lacking chromosomes.
I wish to express my sincere thanks to Prof. H. KIHARA for his kind directions throghout the course of this investigation, and for his generosity in giving me his valuable materials. Thanks are also due to Miss NONOGAKI for her help in making slides.View full abstractDownload PDF (2252K) -
K. HIRATA1929 Volume 4 Issue 4 Pages 198-201
Published: 1929
Released on J-STAGE: November 30, 2007
JOURNAL FREE ACCESS1. There exists an XY- pair in the male and the male intersexual hemp.
2. As this unequal pair is not present in the pollen mother cells of female intersexes, it is probably safe to assume that an XX-pair exists in the female.View full abstractDownload PDF (767K) -
MUNEO KIKUCHI1929 Volume 4 Issue 4 Pages 202-212
Published: 1929
Released on J-STAGE: November 30, 2007
JOURNAL FREE ACCESSThe results obtained from the above mentioned investigations may be summarized as follows:
1. According to the chromosome number, species of Linum used by the writer may be classified into four groups having 9, 15, 18 and 43 (?) in haploid numbers respectively.
2. The difference in the size and shape of chromosome was not noted in both gametic and somatic cells.
3. L. usitatissimum did not reveal any variation in the chromosome number, showing always x=15 and 2x=20
4. In the hybrid of L. perenne×L. alpinum, chromosome number in the somatic cell of F1 is the sum of gametic ones of the parental plants, i. e. 9+18=27.
5. In the heterotypic division of pollen mother cells of F2 plant, there is seen the irregular chromosome behavior, where 9 lagging univalent chromosomes separate at random to each pole, and in the homeo-typic metaphase various numbers of chromosomes from 9 to 18 were counted.
6. In the karyological observation of F2 plants, 20, 28 and 34 somatic chromosome numbers were detected in young root tip cells.View full abstractDownload PDF (1270K) -
[in Japanese]1929 Volume 4 Issue 4 Pages 213-215
Published: 1929
Released on J-STAGE: November 30, 2007
JOURNAL FREE ACCESSDownload PDF (151K)
- |<
- <
- 1
- >
- >|