title: Nucleolus organizer competition in Triticum aestivum - Aegilops umbellulata chromosome addition lines.
abstract: The nucleolar organizer activity of wheat (Triticum aestivum, AABBDD) and Aegilops umbellulata (UU) chromosomes have been analyzed in the complete set of the chromosome addition lines by using a highly reproducible silver-staining procedure. Chromosomes 1U and 5U produce the partial inactivation of wheat nucleolar organizer chromosomes 6B, 1B and 5D. The chromosomes D and G from Ae. umbellulata, which are not SAT-chromosomes, seem to specifically influence the activity of wheat NORs. The predominant status of the U genome with respect to nucleolar competition in the Triticeae is confirmed.
authors.affiliation: Departamento de Genética, Facultad de Biología, Universidad Complutense, E-28040, Madrid, Spain.
authors.forename: J R
authors.initials: JR
authors.lastname: Lacadena
authors.forename: M C
authors.initials: MC
authors.lastname: Cermeño