UNCOMMON MOTIVES OF NUCLEOTIDE-SEQUENCE A DJACENT TO THE PUTATIVE TRANSCRIPTION INITIATION SITE IN THE RDNA INTERGENIC SPACER OF DIPLOID WHEAT TRITICUM-URARTU THUM. EX GANDIL, TRITICUM-BOEOTICUM BOISS, AND TRITICUM-MONOCOCCUM

In the intergenic spacer (IGS) of rDNA of diploid wheats Triticum urar tu, T. boeoticum, and T. monococcum, the uncommon motives adjacent to the site of transcription initiation (TIS) are revealed. They are loca ted in the region from -6 to +1 relative to the putative TIS and are n ot encountered in cereals studied earlier. In T. urartu and T. boeotic um, the motif TACTATG has been revealed, in T. monococcum-TATTATG, whi le diploid Aegilops speltoides has the motif TATAGTA, typical of the r emaining cereal species, The TIS-surrounding rDNA IGS region of diploi d wheats was compared to the correspondent known rDNA IGS regions of d ifferent plant and animal species.