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Featured researches published by Masa-Aki Yamada.


Chromosoma | 1994

Multiplication of 28S rDNA and NOR activity in chromosome evolution among ants of the Myrmecia pilosula species complex

Hirohisa Hirai; Masa-Toshi Yamamoto; Keiji Ogura; Yoko Satta; Masa-Aki Yamada; Robert W. Taylor; Hirotami T. Imai

AbstractChromosomal localization of rDNA in samples of five taxa of the Myrmecia pilosula species complex (Hymeoptera: Formicidae: Myrmeciinae) with 2n=3 (M. croslandi), 8 (M. imaii), 10 (M. banksi), 18 (M. haskinsorum), and 27 (M. pilosula) was carried out by fluorescence in situ hybridization (FISH) using cloned M. croslandi rDNA (pMc.r2) including the coding region for 28S rRNA. Results show that (1) the 28S rDNA in the genome of these ants is repetitive and is localized in pericentromeric C-bands, (2) the number of chromosomes carrying rDNA is two in M. croslandi, M. imaii and M. banksi, six in M. haskinsorum and ten in M. pilosula, and (3) only one or two clusters of rRNA genes generate nucleoli in each species. We suggest that the rDNA in the ancestral stock of the M. pilosula complex was localized originally in a pericentromeric C-band, and multiplied by chance with time during saltatory increases in C-banding following episodes of centric fission. Most rDNA multiplied on various chromosomes seems to be inactivated and eliminated from the genome, together with C-bands, by


Genetics Research | 1992

A nuclear gene modifying instability of fertility restoration in cytoplasmic male sterile rice

Yoshio Sano; Mitsugu Eiguchi; Hiro-Yuki Hirano; Masa-Aki Yamada


Genetics | 1971

HEREDITARY CHANGE IN BOMBYX AFTER TREATMENT WITH DNA

Saburo Nawa; Bungo Sakaguchi; Masa-Aki Yamada; Mitsuo Tsujita

{\text{A}}\overline {\text{M}}


The Japanese Journal of Genetics | 1992

Phase specific Ag-staining of nucleolar organizer regions (NORs) and kinetochores in the Australian ant Myrmecia croslandi

Hirotami T. Imai; Hirohisa Hirai; Yoko Satta; Toshihiko Shiroishi; Masa-Aki Yamada; Robert W. Taylor


The Japanese Journal of Genetics | 1975

HEREDITARY CHANGES IN CAPSICUM ANNUUM L.

Saburo Nawa; Masa-Aki Yamada; Yasuo Ohta

-inversion or centric fusion, with the remnant rDNAs dispersed in the genome by centric fission and


The Japanese Journal of Genetics | 1982

A mutant of SR organism (SRO) in Drosophila that does not kill the host males

Masa-Aki Yamada; Saburo Nawa


The Japanese Journal of Genetics | 1987

Cloning of the plasmids in cytoplasmic male sterile rice and changes of organization of mitochondrial and nuclear DNA in cytoplasmic reversion

Saburo Nawa; Yoshio Sano; Masa-Aki Yamada; Taro Fujii

{\text{A}}\overline {\text{M}}


The Japanese Journal of Genetics | 1985

Absence of resistance genes against male-killing action of the SRO in Drosophila melanogaster

Masa-Aki Yamada; Takao Koana


The Japanese Journal of Genetics | 1977

EFFECTS OF SR FACTOR AND DA GENE ON THE VIABILITY OF THE HYBRID BETWEEN DROSOPHILA MELANOGASTER AND D. SIMULANS

Masa-Aki Yamada

-inversion.


The Japanese Journal of Genetics | 1978

DNA-INDUCED TRANSFORMATION IN SILKWORM

Saburo Nawa; Masa-Aki Yamada; Mitsuo Tsujita

The present study was carried out to examine the genetic mechanism responsible for reversions to fertile phenotype detected in cytoplasmic male-sterile plants of rice. The cms-bo cytoplasm of Chinsurah boro II gave rise to male-sterility in plants without a gametophytic restorer gene (/?/i). Taichung 65 (T65A) was known to be the maintainer which carries no restorer; however, Taichung 65 preserved in our laboratory (T65B) showed partial fertility (about 8 % seed set) when crossed with the male-sterile plants. Unexpectedly, the seed fertility gradually increased with repeated selfings and almost fully fertile plants were obtained in the F6 generation. The cytoplasmic substitution lines revealed that reversions to fertile phenotype resulted from mutational events at the nuclear level. The genetic experiments indicated that the partial fertility observed in the F1 hybrid was controlled by a dominant gene, Ifrv which was carried by T65B. The results obtained suggested that Ifr1 itself was associated with instability of fertility restoration in the presence of cms-bo cytoplasm since partially fertile plants carrying Ifrl always showed a tendency for gradual increase in fertility in the later generations. The results are also discussed in relation to a rapid genetic change through intensified gametic selection combined with instability.

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Saburo Nawa

National Institute of Genetics

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Mitsuo Tsujita

National Institute of Genetics

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Hirohisa Hirai

Primate Research Institute

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Hirotami T. Imai

National Institute of Genetics

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Yoshio Sano

National Institute of Genetics

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Robert W. Taylor

Commonwealth Scientific and Industrial Research Organisation

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Hiro-Yuki Hirano

National Institute of Genetics

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Keiji Ogura

Kyoto Institute of Technology

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Masa-Toshi Yamamoto

Kyoto Institute of Technology

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