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Volume 57 (1982)
- Issue 6 Pages 613-
- Issue 5 Pages 467-
- Issue 4 Pages 343-
- Issue 3 Pages 221-
- Issue 2 Pages 101-
- Issue 1 Pages 1-
Volume 57, Issue 2
Displaying 1-8 of 8 articles from this issue
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II. Geographical variation of chromosomes in the house shrew, Suncus murinus (Soricidae), in East, Southeast and Southwest Asia, with a note on the karyotype evolution and distributionTosihide H. YOSIDA1982 Volume 57 Issue 2 Pages 101-111
Published: 1982
Released on J-STAGE: July 25, 2006
JOURNAL FREE ACCESSKaryotypes of the house shrew (Suncus murinus) collected from 8 different localities in East, Southeast and Southwest Asia were examined with an interest of the geographical variation and distribution of this animal. Specimens collected from 7 localities in Japan, Indonesia and India had always 40 chromosomes (basic type), with apparent geographical variations in the size and shape of the Y chromosome. Specimens collected from Sri Lanka, on the other hand, had 32 chromosomes, among which 4 pairs were large metacentrics, probably derived from the Robertsonian fusion of 8 acrocentric pairs in the basic karyotype. Referring to the present and other studies, it is suggested that the house shrews with 40 chromosomes should have distributed originally in India, and then migrated to Southwest, Southeast and East Asia. The chromosome number reduction could have occurred in the animals moved to southern India and then they migrated to Sri Lanka. Mechanism of the karyotype evolution in the house shrew is discussed in relation to the environmental mutagens.View full abstractDownload PDF (581K) -
Osamu KITAGAWA, Ken-Ichi WAKAHAMA, Yoshiaki FUYAMA, Yoko SHIMADA, Etsu ...1982 Volume 57 Issue 2 Pages 113-141
Published: 1982
Released on J-STAGE: July 25, 2006
JOURNAL FREE ACCESSThe evolutionary genetic studies of more than ten species or subspecies belonging to the D. nasuta subgroup lead the following conclusions:
Morphological differentiation has been observed qualitatively as well as quantitatively, but closely related species could not be identified by means of the techniques of external morphology.
By the hybridization tests, D. nasuta, Indian D. nasuta, D. albomicans, and D. kepulauana are closely related species, and four subspecies of D, sulfurigaster are close to D, pulaua. D. kohkoa, D, pallidifrons and Taxon-F are related species to D, sulfurigaster, but are differentiated from each other.
Judging from the allozyme analyses, the local populations of D. nasuta were genetically similar in two Esterase loci. The Chiangmai population was differentiated from other allopatric populations of D. sulfurigaster albostrigata.
The pattern of the speciation process in the D. nasuta subgroup was discussed.View full abstractDownload PDF (1148K) -
Jinn Lih CHERN, Taira KATAYAMA1982 Volume 57 Issue 2 Pages 143-153
Published: 1982
Released on J-STAGE: July 25, 2006
JOURNAL FREE ACCESSOf 3, 746 rice varieties and strains collected from all over the world, 2, 842 (75.87%), 900 (24.03%), 2 (0.05%) and 2 (0.05%) showed J-, I-, O- and M-type zymograms of acid phosphatase, respectively. The gene symbols Acp19 Acp2Nul, Acp1-4 Acp2Fa, Acp1Nul Acp2Fa and Acp1Nul Acp2Nul were given for the J-, I-, O- and M-type zymograms, respectively, following the format described by Pai et al. (1975). Hereafter, however, in this paper the authors mainly used only the gene symbol of the Acp1 except the M-type zymogram, because the Acp1 locus was closely linked with Acp2 as described by Pai et al. (1975). F2 generations obtained from the F1 between the I- and J-types gave a good fit to a 1:2:1 ratio suggesting that these zymograms were controlled by Acp1 locus which carried two codominant alleles. The O-type zymogram was spontaneously induced mutant from the I-type, and controlled by a single recessive silent allele, Acp1Nul. The M-type was artificially induced mutant from the J-type, and governed by double recessive alleles, Acp1Nul Acp2Nul. From the results described above, all varieties and strains of the sativa rice plants were divided into either the genotypes Acp19/Acp19 or Acp1-4/Acp1-4. The gene Acp1-4 is distributed in the low latitude area with high frequencies, while the gene Acp19 predominates in the high latitude area.View full abstractDownload PDF (440K) -
Tsuneo KATO, Hirotada YAMAGATA1982 Volume 57 Issue 2 Pages 155-162
Published: 1982
Released on J-STAGE: July 25, 2006
JOURNAL FREE ACCESSUsing two tetraploid wheat-rye F1 lines with and without 5B chromosome, it was examined whether the effect of high temperature (30°C) on homoeologous chromosome pairing varied or not depending upon the developmental stage of the treated PMCs. Experimental results clearly showed that the sensitive stage to high temperature occurred in the middle of premeiosis for a brief period, and that this period corresponded to the period demonstrated for homologous pairing in common wheat fairly well. Thus, it was suggested that three genotypes discussed here, those of the two F1s and common wheat, possess a common step for controlling chromosome pairing, and this step is subject to a disturbance by high temperature at the "high-temperature-sensitive stage". The marked increase of homoeologous pairing by temperature- treatment was briefly discussed on its practical significance in wheat breeding.View full abstractDownload PDF (321K) -
Akira KODAMA, John P. MITCHELL1982 Volume 57 Issue 2 Pages 163-169
Published: 1982
Released on J-STAGE: July 25, 2006
JOURNAL FREE ACCESSLevels of ploidy, karyotype, mitosis and relative DNA content of chromosomes in crown gall tumor cells in stem and leaf of Crepis capillaris were studied. Except for about 7% tetraploid mitoses, dividing cells were found to be mainly diploid in both stem and leaf tumors. The karyotype and mitosis in tumor cells were not detectably different from normal cells. The relative DNA content of homologous pairs of chromosomes in the genome of tumor cells was similar to that of root tip cells. These observations indicate that no dramatic change in DNA content or DNA distribution occurred when tissue was transformed to crown gall tumor.View full abstractDownload PDF (370K) -
Raissa L. BERG1982 Volume 57 Issue 2 Pages 171-183
Published: 1982
Released on J-STAGE: July 25, 2006
JOURNAL FREE ACCESSDownload PDF (709K) -
Coleoptera: CurculionidaeYasushi TAKENOUCHI1982 Volume 57 Issue 2 Pages 185-187
Published: 1982
Released on J-STAGE: July 25, 2006
JOURNAL FREE ACCESSThe chromosomes of the Japanese weevil, Catapionus gracilicornis Roelofs, have been investigated in Niigata Prefecture. A triploid parthenogenetic race (3x=33) was found in Miomote. The species is now known to have three parthenogenetic races, 3x, 4x, 5x, as well as a diploid bisexual race.View full abstractDownload PDF (167K) -
Shigeaki HARAYAMA, Tetsuo IINO1982 Volume 57 Issue 2 Pages 189-191
Published: 1982
Released on J-STAGE: July 25, 2006
JOURNAL FREE ACCESSWe isolated mutations in cys genes located in close vicinity of recA gene in Escherichia coli, by insertion of Tn1, Tn5 or Tn1O. We deviced a simple method constructing recA strains using these mutations. The cys mutations were transduced by P1kc into an appropriate recipient selecting for drug resistance of the mutations. The resultant Cys- transductants were crossed with an Hfr RecA- strain, KL16-99, and Cys+ recombinants were picked up. Among them, small colony formers were Rec- strains.View full abstractDownload PDF (135K)
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