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Volume 54, Issue 1
Displaying 1-7 of 7 articles from this issue
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XI. ALIEN ADDITION LINES OF O. SATIVA WITH SINGLE CHROMOSOMES OF O. OFFICINALISYOUNG-BOUM SHIN, TAIRA KATAYAMA1979 Volume 54 Issue 1 Pages 1-10
Published: 1979
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSFrom crosses between allotriploid plants with genomes AAC and diploid O. sativa plants (AA), twelve types of alien addition lines with single C-genome chromosome were distinguished on the basis of morphological characteristics of the addition type plants. Of the twelve chromosomes of O. officinalis (W0065), six appeared to be homoeologous with those of O. sativa in varying degrees. The occurrence of many univalents in the PMCs of two alien addition lines, G and J, suggests that two chromosomes of O. officinalis (W0065) have genes which disturb the pairing of homologous sativa chromosomes.View full abstractDownload PDF (755K) -
HIROSHI NYUNOYA, TATSUO ISHIKAWA1979 Volume 54 Issue 1 Pages 11-20
Published: 1979
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSCharacteristics of a mutant of Coprinus macrorhizus which forms white callus-like masses of densely packed hyphae designated as “rockery” have been described. Formation of both rockeries and monokaryotic fruiting bodies required light, but rockeries once formed inhibited the formation of monokaryotic fruiting bodies. Genetic analyses revealed that this mutant carried the genes for rockery formation (roc) and monokaryotic fruiting (fisC5), but the expression of roc and fisC5 was suppressed in dikaryons. The expression of rockery character resulted in suppression of production of tyrosinase and melanin in mycelia of roc fisC5 strain.View full abstractDownload PDF (1249K) -
TSUNEO KATO, HIROTADA YAMAGATA1979 Volume 54 Issue 1 Pages 21-26
Published: 1979
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSFor the purpose of clarifying the actions of high temperature and 5BL on chromosome pairing, the response of the regulation system with 5BL to temperature of 15-30°C was examined using wheat-rye F1 plants with or without 5B. The results revealed that by the treatment of 30°C the homoeologous pairing was inhibited in the plants without 5B but was promoted in those with 5B. These findings could be successfully explained by a cooperative action of high temperature and 5B. The present results were consistent with an assumption that high temperature and 5BL influence chromosome pairing through the disturbance of spatial arrangement of chromosomes in premeiotic interphase. It was also suggested that colchicine might be similar to high temperature and 5BL in its acting mechanism on chromosome pairing.View full abstractDownload PDF (1053K) -
TOSIHIDE H. YOSIDA1979 Volume 54 Issue 1 Pages 27-34
Published: 1979
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSAmong 22 F2 offspring from matings of the Oceanian (2n=38, _??_) and the Ceylonese type (2n=40, _??_) black rats, two XO females and one XXY male were obtained. The karyotype of the two XO females showed the Oceanian type, but the chromosome number was 37 by the X monosomy. The XXY male showed the Ceylonese type, but the chromosome number was 41 by the sex chromosome aneuploidy. The external features of the rats with these anomalies were apparently normal, although their fertility could not be determined. Based on the occurrence of sex chromosomal anomalies in both female (XO) and male (XXY) in the F2 hybrids, the anomalies are assumed to be caused by non-disjunction of the sex chromosomes in gametogenesis of the F1 hybrids.View full abstractDownload PDF (883K) -
HIROSHI SUGE1979 Volume 54 Issue 1 Pages 35-42
Published: 1979
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSGibberellin (GA) relationships were examined in a spontaneous dwarf mutant and its original normal variety of sweet potato. The dwarf strain had shorter internodes than the normal strain although its leaf petiole remained unchanged. Grafting of dwarf scion onto normal stock did not induce normal growth of the dwarf scion, and normal scion grafted onto dwarf stock did not alter the normal growth. The amount and kind of endogenous GAs did not seem to differ between the normal and dwarf strains. Applied GA3 markedly stimulated the growth of normal strain but did not stimulate the growth of dwarf strain markedly. Application of CCC, an inhibitor of GA biosynthesis, greatly reduced the amount of GAs and the growth of leaf petioles and stems in both strains. It was suggested that dwarf strain had a partial block to the utilization of GAs in the stem but not in the leaf petiole.View full abstractDownload PDF (968K) -
TAIRA KATAYAMA, WATARU ONIZUKA1979 Volume 54 Issue 1 Pages 43-46
Published: 1979
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSCytological and morphological studies were made on the F1 plants obtained from the crosses between Oryza sativa (AA) and two species with unknown genomes, O. ridleyi and O. meyeriana. As expected from the parental species, 2n=36 and 2n=24 chromosomes in the somatic cells were counted in the F1 plants of O. sativa×O. ridleyi and O. sativa×O. meyeriana, respectively. At meiotic division, almost all the chromosomes failed to make pairing. The results suggest that both species, O. ridleyi and O. meyeriana, have different genomes from O. sativa (AA).View full abstractDownload PDF (584K) -
HIROKAZU FUJIMOTO, KEIKO O. YANAGISAWA, CHIZUKO MUROSAKA1979 Volume 54 Issue 1 Pages 47-49
Published: 1979
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSThe short-tailed mutation (T10r) induced by X-irradiation is allelic to the Brachyury (T) on chromosome 17 of the mouse. Embryos homozygous for the T10r are arrested developmentally at an earlier stage than T/T embryos, but T10r/T embryos are indistinguishable from the T/T. Serological studies suggest that the T10r for may be a deletion. The present study examined genetic interaction of the T10r and lethal t-haplotypes (tw32, t1, tw5, tw18, and tw1). The T10r/tn heterozygotes gave rise to viable tailless mice. Therefore, the T10r is similar to the T in interaction with recessive lethal t-haplotypes. Lethality factors of such t-haplotypes are mapped outside the abnormal region of T10r.View full abstractDownload PDF (269K)
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