NUCLEOTIDE-SEQUENCE AND GENOME ORGANIZATI ON OF THE AT-RICH REPEATED DNA FAMILY IN DIPLOID WHEAT TRITICUM-MONOCOCCUM L

In diploid wheat Triticum monococcum L., a novel family of AT-rich rep eated DNA sequences arranged in clusters of tandem arrays of 560-bp fr agments is described. The nucleotide sequence of a 556-bp repeat unit was determined. The basic structural unit of this repeated DNA family contains subrepeats with the main motif AAACATTGTTAC. This type of rep etitive DNA sequence could evolve via tandem amplification of short su brepeats with some subsequent divergence, and/or via recombination wit h unique sequences. Structural organization of homologous sequences, r evealed by blot hybridization in other representatives of the Triticea e tribe, suggest that this family of repeated DNA is genome-specific.