SEIJO Jose Guillermo
Characterization of Arachis D genome using physical mapping of heterochromatic regions and rDNA loci by FISH.
ROBLEDO, GERMÁN; SEIJO, J.G.
GENETICS AND MOLECULAR BIOLOGY
Sociedad Brasilera de Genética
Lugar: Sao Paulo; Año: 2008 vol. 31 p. 717 - 717
Characterization of the Arachis (Leguminosae) D genome using fluorescence in situ hybridization (FISH) chromosome markers and total genome DNA hybridization Germán Robledo1 and Guillermo Seijo1,2 1Instituto de Botánica del Nordeste, Corrientes, Argentina. 2Facultad de Ciencias Exactas y Naturales y Agrimensura, Universidad Nacional del Nordeste, Corrientes, Argentina. Abstract Chromosome markers were developed for Arachis glandulifera using fluorescence in situ hybridization (FISH) of the 5S and 45S rRNA genes and heterochromatic 4-6-diamidino-2-phenylindole (DAPI) positive bands. We used chromosome landmarks identified by these markers to construct the first Arachis species ideogram in which all the homologous chromosomes were precisely identified. The comparison of this ideogram with those published for other Arachis species revealed very poor homeologies with all A and B genome taxa, supporting the special genome constitution (D genome) of A. glandulifera. Genomic affinities were further investigated by dot blot hybridization of biotinylated A. glandulifera total DNA to DNA from several Arachis species, the results indicating that the D genome is positioned between the A and B genomes. Key words: chromosome markers, DAPI bands, rDNA loci, dot blot hybridization, genome relationships.