Evolution Study of Wheat (Tritium aestivum L.) A, B and D Genome Based on DNA Sequence Similarity

Tritium aesrivum L., and its four potential origin species T urartu T., T. monococcum L., Ae.squarrosa L. and T.dicoccum S., were amplified with MWG913, a STS marker located in 1H chromosome of barley. Those products are cloned and sequenced. By the discrepancies of these sequences, we have obtained some evidences about the origin of wheat A, B, D genomes at molecular level. The results showed that the studied sequence in A genomes of Tritium aestivum L. was identical with that of T. urartu T., T monococcum L. and T dicoccum S.; that in D genome of Tritium aestivum L. was as same as that of Ae. squarrosa L.; that in B genome of Tritium aestivum L. differed from that of T. dicoccum S. in 0.61%. The results also suggested that A, B and D genome have the different evolution speed.