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On the basis of the entire mitochondrial DNA sequence of common wheat, Triticum aestivum, 21 mitochondrial microsatellite loci having more than ten mononucleotide repeats were identified. The mitochondrial microsatellite variability at all loci was examined with 43 accessions from 11 Triticum and Aegilops species involved in wheat polyploidy evolution. Polymorphic banding patterns were obtained at 15 out of 21 mitochondrial microsatellite loci. The number of alleles per polymorphic microsatellite ranged from 2 to 5 with an average of 3.07, and the diversity values (H) ranged from 0.09 to 0.50 with an average of 0.29. These values are almost two third of wheat chloroplast microsatellite values, indicating that variability of mitochondrial microsatellite is much less than that of chloroplast microsatellite. Based on the allele variation at all loci, a total of seven mitochondrial haplotypes were identified among common wheat and its ancestral species. Three diploid species showed their own specific haplotypes and timopheevi group (11 accessions) had three types, whereas 29 accessions of emmer and common wheat groups shared the same haplotype. These results indicate that a single mitochondrial haplotype determined by microsatellite analysis has conservatively been maintained in the evolutionary lineage from wild tetraploid to cultivated hexaploid species.

Mitochondrial microsatellite variability in common wheat and its ancestral species