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Volume 33, Issue 4
Displaying 1-5 of 5 articles from this issue
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II. On the chromosomes of F1-hybrids between the weak and strong racesKazuo SAITOH1958 Volume 33 Issue 4 Pages 97-101
Published: 1958
Released on J-STAGE: November 30, 2007
JOURNAL FREE ACCESSIn F1 strong-weak and weak-strong hybrids of the gypsy moth the metaphase chromosomes were studied in the primary and secondary spermatocytes, with special regard to the size and behavior of chromosomes. Haploid chromosomes, 31 in number, show the usual circular arrangement at metaphase. They are oval or round in outline without showing any remarkable size-difference, and quite regular in meiotic pairing.View full abstractDownload PDF (265K) -
II. Mutant isoalleles at the +w3 gene locus in the silkwormNarumi YOSHITAKE1958 Volume 33 Issue 4 Pages 102-106
Published: 1958
Released on J-STAGE: November 30, 2007
JOURNAL FREE ACCESSAmong the so-called normal eggs of the silkworm there are some with deep colored and some with pale colored serosal cells. The causes producing such a variation are attributed to difference in the amount of 3-hydroxykynurenine and the differential enzymatic action. In this connection, by making an analysis of the gene controlling this enzyme activity, the author has found +w3 gene to be the most important. On the locus of +w3 gene exist several kinds of isoallelic genes and their activities differ more or less quantitatively. One of the causes which change the color tone of serosal cells in normal strains is considered to be this difference of +w3 gene.View full abstractDownload PDF (340K) -
Humihiko ONO, Sizue NAGAI1958 Volume 33 Issue 4 Pages 107-113
Published: 1958
Released on J-STAGE: November 30, 2007
JOURNAL FREE ACCESSCrepidiastrum platyphyllum occurs only in Bôsô and Miura Peninsula, the northern limit of the genus. In the southern parts there occurs only Crepidiastrum Keiskeanum. The individualities of these species are presumed to be kept by the isolation, geographical or physiological or both. But the results of artificial hybridization of these two species eliminate the possibility of the physiological isolation.
The studies of meiosis of this hybrid gave further examples of the residual pairing, which was abundantly observed in the progenies of intergeneric hybrids of the species of this group. The characteristic feature of the residual pairing is the diminution of multivalents during the progress of meiotic prophase, the result being the normal anaphase inspite of the occurrence of many multivalents at diplotene.View full abstractDownload PDF (872K) -
Calcium metabolism of Mycobacterium 607, with special reference to the cytological effects of calcium-radio isotope (45Ca)Akira YUASA, Tadashi HIRANO, Osamu SUZUKI1958 Volume 33 Issue 4 Pages 114-119
Published: 1958
Released on J-STAGE: November 30, 2007
JOURNAL FREE ACCESSThough calcium is not an essential element, it is absorbed into the bacterial cell and certain amount of calcium is used for early growth of Mycobacterium 607.
But, calcium seems to be absorbed into the bacterial cell by selection. Also, the radioactivity (β-ray) of calcium-radio isotope (45Ca) seems to inhibit the septa-formation which is done during the cell division in early stage of growth.
Accordingly, the bacterial cell becomes longer than usual one.View full abstractDownload PDF (847K) -
I. External characteristics and meiosis of TdicHRF1, TperHRF1 and TturHRF1 plantsGoichi NAKAJIMA1958 Volume 33 Issue 4 Pages 120-126
Published: 1958
Released on J-STAGE: November 30, 2007
JOURNAL FREE ACCESS1. Karyogenetical researches were carried out on trigeneric F1 hybrids raised from Triticum×Haynaldia F1 crossed with Secale.
2. Hybridization was successful to have trigeneric F1 in crossing Triticum× Haynaldia F1 with Secale, but it was failed in crossing Triticum×Secale F1 with Haynaldia.
3. The number of somatic chromosomes of the trigeneric F1 hybrids, T. dicoccum var. atratum×H. villosa F1×S. cereale (TdicHRF1), T. persicum×H. villosa F1×S. cereale (TperHRF1) and T. turgidum×H. villosa F1×S. cereale (TturHRF1), were 27 (TdicHRF1-1) 28 (TdicHRF1-2, TturHRF1-) and 29 (TperHRF1-2) respectively.
4. In two individuals of TdicHRF1 hybrid, the number of bivalents at heterotypic metaphase of PMCs is given in Table 3. Ring-shaped bivalents were occasionally observed besides stick-shaped ones (65.33% in No. 2 and 59.88% in No. 1). In both cases 3 of them seem to pair in autosyndesis of AB genome hromosomes of T. dicoccum. But it seems more probable that the bivalents of the two individuals may have been produced by conjugation of partial homologous chromosomes by translocation between the chromosomes of AB genomes or between the chromosomes of AB and R or V genomes. For in these individuals abundant ring-shaped bivalents were observed and also the number of bivalents was more numerous than expected, although the chromosomes were less than those of eu-tri-generic hybrid.
5. However the number of bivalents in heterotypic metaphase of PMCs TperHRF1 hybrid was at most 4. The bivalents may be due to autosyndesis of chromosomes of AB genomes of T. persicum. Ring-shaped bivalents, besides stickshaped, were rarely observed (6.06%).View full abstractDownload PDF (1017K)
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