对人工合成小麦的微卫星变异分析

doi:10.3724/SP.J.1006.2011.01491

Abstract

Abstract: Microsatellites or simple sequence repeats (SSR) are ubiquitous in organism genomes. Investigation on the SSR variations induced by allopolyploidization is useful to understand the evolution of allopolyploid.In this study, we compared SSR loci using primers specific to A, B, and D genomes in five synthesized hexaploid wheat between tetraploid wheat Langdon and five accessions of Aegilops tauschii. The results showed that 4.0% (5 out of 125) and 4.8% (6 of 125) genomic SSRs on A and B genomes exhibited variations, respectively. A low frequency (2.6%) of variations was observed in the expressed sequence tag (EST)-SSRs located on A/B genomes. This indicated that lower variation existed in functional genes than in non-coding regions, i.e. genomic SSR. In addition, 2.9% (3 of 103) genomic SSRs on D genome showed variations. Sequence analyses indicated that the length of SSRs was mainly due to the variation of the number of repeated units. The microsatellitesequences with disappearance may be more likely to be changed than the ordinary microsatellite sequences.The ubiquitous microsatellites may play an important buffering role to achieve genome stability and plasticity inpolyploidy evolution.

Key words: Synthetic wheat, Ae. tauschii, Microsatellite, Sequence variation, Allopolyploidization

WANG Bian-Yin, ZHAI Jun, HAO Yuan-Feng, LI An-Fei, KONG Lian-Rang. Microsatellite Variation in Synthetic Hexaploid Wheat[J].Acta Agron Sin, 2011, 37(08): 1491-1496.

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Microsatellite Variation in Synthetic Hexaploid Wheat

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