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Volume 32, Issue 6
Displaying 1-4 of 4 articles from this issue
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Yü CHING-JANG, Yao YÜN-TE1957 Volume 32 Issue 6 Pages 179-188
Published: 1957
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESS1. Wir haben Ausschusszeit an den Reissorten Shinriki, Taichung Nr. 65 und ihren Bastarden F2 und F3 untersucht. Wir fanden als das Vehältnis der frühausschiessenden zu den spätausschiessenden F2 in der ersten Kulturperiode 3:1, in der zweiten Kulturperiode 15:1.
2. Unter den F3 gibt es Linien mit kurzer und langer Ausschussdauer. Für die F3, die von den F2 der ersten Kulturperiode erhalten waren, fanden wir als das Verhältnis der Linien mit langer Ausschussdauer zu dem mit kurzer Ausschussdauer 3:1. Für die F3 der zweiten Kulturperiode konnten wir die entsprechende Zahl nicht bestimmen.
3. Zwischen den Ausschusszeiten der F2 und denen von F3 besteht eine enge Korrelation. Allerdings fanden wir zwei F3-Linien mit später Ausschusszeit, die von F2 mit früher Ausschusszeit abstammten.
4. Wir konnten unsere Ergebnisse erklären durch die Annahme zweier Gene, Fl und Se, die der Ausschusszeit bezw. der Empfindlichkeit gegen die Tageslange entsprechen.View full abstractDownload PDF (772K) -
Takashi ITO1957 Volume 32 Issue 6 Pages 189-193
Published: 1957
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESS1. A. new theory of crossing-over was presented from entirely new standpoint. One dimentional simple harmonic oscillator in quantum mechanics is the model of this theory. Thus, crossing-over probability distribution along the chromosome corresponds to the square of the Schrödinger wave function Ψ. Fig. 4. shows that the experimental probability distribution along the X chromosome of D. melanogaster fits into the theoretical probability distribution curve for n=3 satisfactorily. Good agreement of this correspondence suggests something essential underlying under the crossing-over phenomenon.
2. The unit length derived as a result of the theoretical treatment, 27c.m., must have a general meaning in both X chromosome and 2nd chromosome of D. melanogaster. Since the predicted centromere (68.3c.m.) agrees well with the cytological centromere (66.0c.m.), the centromere seems to play a determining role in this theory.
3. According to the theory, each region A, B, C, (Fig. 5.)-27c.m.-is not quite independent of each other with respect to the occurrence of one crossing-over in each region. Even if the potential V at the boundary point of two units is not infinite, the theory is modified without changing the nature.
4. Since n=3 means an excited state in quantum mechanical sense, it is very interesting to know this meaning in living organism.View full abstractDownload PDF (544K) -
Goichi NAKAJIMA1957 Volume 32 Issue 6 Pages 194-196
Published: 1957
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESS1. In this investigation, the F1 plants raised between Triticum pyramidale and Secale fragile were studied genetically.
2. In the young stage until the end of the winter, the F1 plants had short narrow and dark green leaves richly haired on the surface of them. These characteristics seem due to S. fragile. At the ripening stage, the external characteristics of the F1 plants resembled rather closely to the pollen parent than being the intermediate of both parents (Table 2, Fig. 1). The external characteristics undoubtedly show that they are the F1 hybrids between T. pyramidale×S. fragile though the chromosomes have not been observed.
3. The spikelets of the F1 plants were not brittle even in the ripening stage, while they are very brittle in the case of the F1 plants raised between Emmer wheat and wild Secale, as africanum or montanum.
4. No pistile and stamen are found in all the flowers of any spikelet in the F1 hybrids.View full abstractDownload PDF (310K) -
Michiharu SEGAWA1957 Volume 32 Issue 6 Pages 197-201
Published: 1957
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSIn two dioecious species, i. e. Plagiochila ovalifolia (n=9) and Plag. japonica (n=9) have been found the structural sex-chromosomes; the largest heterochromosome of female and of male gametophytes of these species are sex-chromosomes X and Y respectively. The X and Y are, in the nuclear plate, the same in chromosomal morphology, but the difference between their heterochromat in was observed. The chromosome formulae of these species are as follows;
Plagiochila ovalifolia _??_8+X _??_8+Y
Plag. japonica _??_8+X _??_8+YView full abstractDownload PDF (802K)
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