[Distribution of 45S rDNA sequence on chromosomes of Triticum aes-tivum and its relative species].

Fluorescent in situ hybridization (FISH) and sequential C-banding and FISH techniques were used in locating 45S rDNA sequence on specific chromosomes of Triticum monococcum,T. dicoccoides,T. aestivum,Hordeum vulgare,Haynaldia villosa,T. durum-Haynaldia villosa amphiploid,Avena fatus,and Roegneria kamoji. High polymorphism be-tween common wheat and its relatives on 45S rDNA sequence distribution was detected. All the chromosomal secondary constriction regions of these species had 45S rDNA loci. Some non-satellite chromosomes had additional 45S rDNA loci. A 45S rDNA locus was located on the terminal region of the short arm of R. kamoji chromosome 1Rk#1.