Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Physical locations of 5S and 18S-25S rDNA in Asian and American diploid Hordeum species with the I genome
Autore:
Taketa, S; Ando, H; Takeda, K; Von Bothmer, R;
Indirizzi:
Kagawa Univ, Fac Agr, Kagawa 7610795, Japan Kagawa Univ Kagawa Japan 7610795 wa Univ, Fac Agr, Kagawa 7610795, Japan Okayama Univ, Bioresources Res Inst, Kurashiki, Okayama 710, Japan OkayamaUniv Kurashiki Okayama Japan 710 t, Kurashiki, Okayama 710, Japan Swedish Univ Agr Sci, Dept Crop Sci, SE-23053 Alnarp, Sweden Swedish Univ Agr Sci Alnarp Sweden SE-23053 Sci, SE-23053 Alnarp, Sweden
Titolo Testata:
HEREDITY
, volume: 86, anno: 2001,
parte:, 5
pagine: 522 - 530
SICI:
0018-067X(200105)86:<522:PLO5A1>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
RIBOSOMAL-RNA GENES; REPETITIVE DNA-SEQUENCES; SITU HYBRIDIZATION; GENUS HORDEUM; MULTIGENE FAMILY; COMMON WHEAT; BARLEY; LOCI; ORGANIZATION; 18S-5.8S-26S;
Keywords:
barley; Hordeum; in situ hybridization; karyotype evolution; phylogeny; rDNA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
36
Recensione:
Indirizzi per estratti:
Indirizzo: Taketa, S Kagawa Univ, Fac Agr, Kagawa 7610795, Japan Kagawa Univ KagawaJapan 7610795 ac Agr, Kagawa 7610795, Japan
Citazione:
S. Taketa et al., "Physical locations of 5S and 18S-25S rDNA in Asian and American diploid Hordeum species with the I genome", HEREDITY, 86, 2001, pp. 522-530

Abstract

The physical locations of 5S and 18S-25S rDNA sequences in 15 diploid Hordeum species with the I genome were examined by double-target in situ hybridization with pTa71 (18S-25S rDNA) and pTa794 (5S rDNA) clones as probes. All the three Asian species had a species-specific rDNA pattern. In 12 American species studied, eight different rDNA types were found. The type reported previously in H. chilense (the 'chilense' type) was observed in eight American species. The chilense type had double 5S rDNA sites-two sites on one chromosome arm separated by a short distance-and two pairs of major 18S-25SrDNA sites on two pairs of satellite chromosomes. The other seven types found in American species were similar to the chilense type and could be derived from the chilense type through deletion. reduction or addition of a rDNA site. Intraspecific polymorphisms were observed in three American species. The overall similarity in rDNA patterns among American species indicates the close relationships between North and South American species and their derivation from a single ancestral source. The differences in the distribution patterns of 5S and 18S-25S rDNA between Asian and American species suggest differentiation between the I genomes of Asian and American species. The 5S and 18S-25S rDNA sites are useful chromosome markers for delimiting Asian species, but have limited value as a taxonomic character in American species. On the basis of rDNA patterns. karyotype evolution and phylogeny of the I-genome diploid species are discussed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 11/07/20 alle ore 20:39:06