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Volume 47 (1972)
- Issue 6 Pages 399-
- Issue 5 Pages 313-
- Issue 4 Pages 227-
- Issue 3 Pages 159-
- Issue 2 Pages 73-
- Issue 1 Pages 1-
Volume 47, Issue 2
Displaying 1-11 of 11 articles from this issue
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IV. EU- AND ANEUPLOID OFFSPRING FROM ALLO-TRIPLOIDS IN A NATURAL POPULATIONHIROTO ARAKI1972 Volume 47 Issue 2 Pages 73-83
Published: 1972
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESS1. Several types of hypo- and hyper-ploids were found along with euploids BB, BBB, ABB, AABB, and ABBB among plants from a natural population of Scilla scilloides Druce at Nakabaru. Here A (x=8) indicates one of two genomes which compose the S. scilloides complex, and B (x=9) another one. Lacking or additional chromosomes in hypo- and hyper-ploids, ABB-1, -2, ABB+1, +2, +3, +5, AABB-1, -2, -3, were confirmed to be members of the genome A.
2. The majority of progenies from seeds collected from ABB open-pollinated in the natural population was hypo- and hyper-ploid. Hypo- and hyper-ploids were also found in the progenies from the seeds from the mother plants BB and AABB. These facts indicate frequent occurrence of selfing of, and/or crossing between ABB, as well as crossing of ABB with BB and/or AABB. Therefore, ABB is primarily responsible for the origin of hypo- and hyper-ploids in the natural population.View full abstractDownload PDF (1619K) -
KENJIRO KINUGAWA, ICHIRO OTSUKA1972 Volume 47 Issue 2 Pages 85-90
Published: 1972
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSThe germination of the spores of Bryum pseudo-triquetrum was much reduced after irradiation with germicidal ultraviolet light. This reduction was photoreactivated by the irradiation with monochromatic light at 4365 and 4610Å but not at 4070 or 3600Å. At 4610Å, the reactivation rate increased with illuminating time and saturated beyond 60 minutes. The reactivation occurred at 25°C, but not at 2°C. These results suggest that the observed photoreactivation is of the enzymatic nature.View full abstractDownload PDF (581K) -
KAZUYOSHI KIRITANI1972 Volume 47 Issue 2 Pages 91-102
Published: 1972
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSTen ilv multisite mutants deficient in both branched-chain-amino-acid aminotransferase and α, β-dihydroxyacid dehydratase activities were isolated from wild-type and ilvD18 strains Salmonella typhimurium LT2. One of these mutants, KA109, harbors an additional deficiency in the activity of the reductoisomerase. From these mutants, five Ile- strains possessing a defect in the branched-chain-amino-acid aminotransferase were isolated by P22 transduction. The TR109 and DT101 strains (Ile-) grow slow and irregular in minimal medium containing isoleucine unless supplementation with leucine and valine in the medium is made. All Ile- strains accumulate α-keto-β-methylvalerate as well as pyruvate and an unknown α-keto acid in the culture media; α-ketoisovalerate and α-ketoisocaproate have not been detected. By mutual and reciprocal cotransduction tests using ilv multisite mutant as recipient and Ile- mutant as donor, an arrangement of the Ile- mutational sites in ilvE locus was obtained.View full abstractDownload PDF (1098K) -
MASATAKE TANAKA, SADAO ICHIKAWA1972 Volume 47 Issue 2 Pages 103-114
Published: 1972
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSTwo morphologically distinguishable types of Triticum araraticum were crossed to each other and with other tetraploid wheats of nine taxa belonging to Timopheevi and Emmer groups. Crosses were also made between T. timopheevi and two wild Emmer taxa and between a wild taxon and a cultivated taxon of Emmer group. The F1 hybrids obtained from these crosses were examined cytogenetically. It was shown that T. araraticum is very close to T. timopheevi cytologically. One of the two types of T. araraticum (KU 196-2) was proved to have an almost identical chromosome structure with T. timopheevi, while the other (KU 196-1) was shown to have a chromosome structure different from those of the above two at least by a translocation. The F1 hybrid between T. araraticum KU 196-2 and T. timopheevi was fertile, being contrary to the most of the earlier reports. Irregular meiosis, less chiasmata and complete sterility were the characteristics of the F1 hybrids between Timopheevi and Emmer groups. More univalents and less chiasmata were observed in the hybrids of the KU 196-1 stock of T. araraticum with Emmer wheats than in those of the KU 196-2. Also, more univalents and less chiasmata were generally observed in the hybrids of T. araraticum with wild Emmer wheats than in those with cultivated Emmer wheats. Based on these results and earlier reports, it was concluded that the structural differentiation of chromosomes must have acted an important role in the evolutionary courses of the tetraploid wheats which originated from probably a single ancestor.View full abstractDownload PDF (1320K) -
NOBUO TAKAGI1972 Volume 47 Issue 2 Pages 115-123
Published: 1972
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSMorphology and H3-thymidine incorporation patterns of chromosomes were compared in 6 species of the order Passeriformes for the elucidation of karyotypic relatedness. With the exception of sex elements, karyotypes were indistinguishable in L. striata, T. castanotis and P. oryzivora of the family Ploceidae and corresponding chromosomes showed similar late replicating patterns. In spite of apparent karyotypic divergence and late replicating profiles in the remaining 2 species of Ploceidae, S. amandava and B. ruficauda, macrochromosomes of these species seemed to share labeling characteristics with those of above 3 species, which favored the elucidation of involved chromosomal alterations.
The karyotype of C. spinus of the family Fringillidae appeared distinctively different from that of the above 5 species of the family Ploceidae. However, the identical relative length of macrochromosomes together with the characteristic autoradiographic patterns suggested that the intrachromosomal rearrangements had been largely contributed to the karyotypic diversification between C. spinus and L. striata.View full abstractDownload PDF (2722K) -
NATSUKO ESHIMA, SETSUKO FUJII, TADAO HORIUCHI1972 Volume 47 Issue 2 Pages 125-128
Published: 1972
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSDownload PDF (314K) -
II. KARYOTYPES OF DROSOPHILA NASUTA COLLECTED FROM THE SEYCHELLES ISLANDSKEN-ICHI WAKAHAMA, OSAMU KITAGAWA1972 Volume 47 Issue 2 Pages 129-131
Published: 1972
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSDownload PDF (613K) -
YASUSHI OHNUKI, ROBERT S. OLSON, DONALD E. ROUNDS1972 Volume 47 Issue 2 Pages 133-136
Published: 1972
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSDownload PDF (1112K) -
YASUSHI TAKENOUCHI1972 Volume 47 Issue 2 Pages 137-139
Published: 1972
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSThe chromosomes of two T. kônoi males were studied. One had n=12 II+XyP; and one, n=10 II+XyP.View full abstractDownload PDF (192K) -
YASUSHI TAKENOUCHI1972 Volume 47 Issue 2 Pages 141-145
Published: 1972
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSThe chromosomes of four Japanese Hylobius species were studied in male meiosis using squash preparations. The results are: H. galloisi and H. gigas, 2n=36, H. freyi, 2n=28, H. pinastri karafutoensis, 2n=22 and all include an XyP sex-determining system.View full abstractDownload PDF (411K) -
HIROTO ARAKI1972 Volume 47 Issue 2 Pages 147-150
Published: 1972
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSIn Korean samples of Scilla scilloides Druce following cytogenetic types were observed, where A and B denote genomes with x=8 and x=9, respectively: AABB in Suwon, Pusan I, Taegu I, and Taegu II; AABB and AABBB in Kumryong and Song-upri; AABB, ABBB, and AABBB in Pusan II.
Genome A included in the three polyploid types was the same as that comprised in allopolyploids which wide-spread all over the Japan Islands, and different from that identified in diploid AA which was found confined to Korea.View full abstractDownload PDF (341K)
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