Abstract
The Tsn1 gene in wheat confers sensitivity to a proteinaceous host-selective toxin (Ptr ToxA) produced by the tan spot fungus (Pyrenophora tritici-repentis) and lies within a gene-rich region of chromosome 5B. To use the rice genome sequence information for the map-based cloning of Tsn1, colinearity between the wheat genomic region containing Tsn1 and the rice genome was determined at the macro- and microlevels. Macrocolinearity was determined by testing 28 expressed sequence markers (ESMs) spanning a 25.5-cM segment and encompassing Tsn1 for similarity to rice sequences. Twelve ESMs had no similarity to rice sequences, and 16 had similarity to sequences on seven different rice chromosomes. Segments of colinearity with rice chromosomes 3 and 9 were identified, but frequent rearrangements and disruptions occurred. Microcolinearity was determined by testing the sequences of 26 putative genes identified from BAC contigs of 205 and 548 kb in length and flanking Tsn1 for similarity to rice genomic sequences. Fourteen of the predicted genes detected orthologous sequences on six different rice chromosomes, whereas the remaining 12 had no similarity with rice sequences. Four genes were colinear on rice chromosome 9, but multiple disruptions, rearrangements, and duplications were observed in wheat relative to rice. The data reported provide a detailed analysis of a region of wheat chromosome 5B that is highly rearranged relative to rice.
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The project was supported by the National Research Initiative of the USDA Cooperative State Research, Education and Extension Service, grant number 2003-35300-13109 to J.D.F.
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Lu, H., Faris, J.D. Macro- and microcolinearity between the genomic region of wheat chromosome 5B containing the Tsn1 gene and the rice genome. Funct Integr Genomics 6, 90–103 (2006). https://doi.org/10.1007/s10142-005-0020-1
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DOI: https://doi.org/10.1007/s10142-005-0020-1