The Japanese Journal of Genetics

Chromosome Studies in Oryza sativa L

I. The Seondary Association of the Meiotic Chromosome

Kan-Ichi Sakai

1935 Volume 11 Issue 3 Pages 145-156
Published: 1935
Released on J-STAGE: April 04, 2007

DOIhttps://doi.org/10.1266/jjg.11.145

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From the meiotic study of Oryza sativa L., the writer concluded that in regard to the genome of the plant, 12 is not the basic number in the strictest sense, but 5 is the primary one from which the 12 had been derived. In other words, Oryza sativa L. is a doubly hexasomic tetraploid plant which may be represented diagrammatically as follows: n=12 A₁ A₂ B₁ B₂ C₁ C₂ C₃ D₁ D₂ D₃ E₁ E₂
Data suggesting the above conclusion are as follows:
(1) In the course of meiosis, the writer observed quadrivalent association at diakinesis and metaphase I in the normal diploids (figs. 3 and 21, s. also Pl. I-6).
(2) Seconday association of the meiotic chromosomes is very distinct; the maximum association has been two groups of three and three groupe of two (fig. 4 out of 4-6 (PMI), 10 & 11 out of 7-20 (MI) and 22 (AI), and 24 out of 23-28 (MII), s. also Pl. I). The results of observation in the three stages of PMI, MI and MII are seen in table 1 and diagram 1. Average numbers of association in the above three stages are 4.83, 3.73 and 4.37 respectively.
(3) Results of many cytological and genetical investigations by various authors have been reviewed, in which the autosyndetic association of the chromosomes has been repeatedly observed in haploid, diploid and triploid plants and the occurrence of duplicate as well as triplicate genetic factors and the phenomenon of genetic “shift” are reported. These all seem to suggest that O. sativa L. is of secondary polyploidal nature.

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CHLOROPHYLL DEFICIENCIES IN ORYZA SATIVA INDUCED BY X-RAYS

Yoshitaka IMAI

1935 Volume 11 Issue 3 Pages 157-161
Published: 1935
Released on J-STAGE: April 04, 2007

DOIhttps://doi.org/10.1266/jjg.11.157

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Oryza sativa subjected to X-ray treatment resulted in chlorophyll deficiencies to the extent of about 14 times more than in the series untreated. The occurrence of cream and chlorina seedlings is more frequent than those of white, xanthic, and others.
Chlorophyll deficiencies that have been reported previously in this plant are reviewed and classified into genic and plastid mutations, the latter including sporadic and mutable cases. There are two forms of auto-mutable plastids, the one changing from inconstant green to constant white and green, and the other to constant white, but not to constant green.

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CYTOLOGICAL STUDIES ON THE CULTIVATED CROCUS

Kotaro KARASAWA

1935 Volume 11 Issue 3 Pages 162-168
Published: 1935
Released on J-STAGE: April 04, 2007

DOIhttps://doi.org/10.1266/jjg.11.162

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1. The somatic chromosome numbers of fourteen strains of Crocus were studied, in which a new polyploid series having ten as the basic chromosome number, was also detected.
2. The sterility observed in the cultivated Crocus is due to abnormality in reduction divisions.
3. The genomes of some Crocus have been considered in connection with their constitutions.

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INTERGENRA HIBRIDIGO EN CICHORIEAE, II

HIBRIDOJ DE Crepidiastrum lanceolatum var. latifolium KAJ Paraixeris denticulata

H. ONO, D. SATO

1935 Volume 11 Issue 3 Pages 169-179
Published: 1935
Released on J-STAGE: April 04, 2007

DOIhttps://doi.org/10.1266/jjg.11.169

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1) Hibridoj de Crepidiastrum lauceolatum var. latifolium kaj Paraixeris denticulata estas studitaj. Por komparo Paraixeris denticulatoplatyphylla kiu estis konjektita kiel la hibrido de tiuj du specoj estis ankau studita.
2) Preskau samaj hibridoj estas akiritaj per ambauaj hibridigoj, Crepidiastrum lanceolatum var. latifo!ium_??_×Paraixeris denticulata_??_kaj Paraixeris denticulata_??_×Crepidiastrum lanccolatum var. latifoliuma_??_. Kaj en maturigo ili ambau similis ekstermorfologie al Paraixeris denticulatoplatyphylla.
3) Sed en juneco ili ambau similis al sia mema patrino. Tie sajnas trovigi is influo de citoplasmo.
4) La reduktodividigo de la hibridoj estas tute normala. La kiasma frekvenco similis al la patrino: en unuaj hibridoj la frekvenco estis granda kaj en la reciprokaj hibridoj malgranda. Estas interese ke en la reduktodividigo de taksonomike tiel apartaj specoj nur duvalentaj kromosomoj estas observeblaj. La reguleco de kromosomparigo ne sajnas dependi de la homologeco de kromosomoj.
5) Parigo de kromosomoj en reduktodividigo de hibridoj estas konjektita okazi alosindese, kiu estis montrita per la komparo de la gepatraj kaj hibridaj kromosomoj kaj per la trovigo de tri au pli da heteromorfaj duvalentaj kromosomoj en la hibridoj.
6) La reduktodividigo de Paraixeris denticulatoplatyphylla similis al Paraixeris denticzulata_?? ×Crepidiastrum lanceolatum var. latifolium_??_. Pripensante tiun ci fakton kaj ke Paraixeris denticulata estas malmemfekunda, la autoroj konjektas ke plej multo de tiu ci specoj trovebraj en naturo sajnas havi la devenon de Paraixeris denticulata_??_×Crepidiastrum lanceolatum var. latifolium.

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ÜBER DIE BESTÄUBUNG UND BEFRUCHTUNG BEI GINKGO BILOBA L

Tamaki SHIMAMURA

1935 Volume 11 Issue 3 Pages 180-184
Published: 1935
Released on J-STAGE: April 04, 2007

DOIhttps://doi.org/10.1266/jjg.11.180

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[in Japanese]

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ONIYURI NO HUZITUSEI

Masayosi Sato

1935 Volume 11 Issue 3 Pages 185-192
Published: 1935
Released on J-STAGE: April 04, 2007

DOIhttps://doi.org/10.1266/jjg.11.185

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The Genetics of the Mouse. (I) Mutants

Mitosi Tokuda

1935 Volume 11 Issue 3 Pages 193-194
Published: 1935
Released on J-STAGE: April 04, 2007

DOIhttps://doi.org/10.1266/jjg.11.193

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Über die Urmensch-theorie in Blutgruppen-Kunde

T. Kubo

1935 Volume 11 Issue 3 Pages 194-195
Published: 1935
Released on J-STAGE: April 04, 2007

DOIhttps://doi.org/10.1266/jjg.11.194

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On the Finger Prints and the Physical Growth of Twins

G. Fukuoka

1935 Volume 11 Issue 3 Pages 195-196
Published: 1935
Released on J-STAGE: April 04, 2007

DOIhttps://doi.org/10.1266/jjg.11.195

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On the Taxonomical Significance of Chromosomes in the Genus Xiphidon

F. Ohmachi, C. Sokame

1935 Volume 11 Issue 3 Pages 197-198
Published: 1935
Released on J-STAGE: April 04, 2007

DOIhttps://doi.org/10.1266/jjg.11.197

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On the Heritable Asynapsis in Plants. (Collective review)

T. Akemine

1935 Volume 11 Issue 3 Pages 199-204
Published: 1935
Released on J-STAGE: April 04, 2007

DOIhttps://doi.org/10.1266/jjg.11.199

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