Summary
Aegilops tauschii (Coss.) Schmal. (2n = 2x = 14, DD), a wild relative of wheat has been considered to be a valuable source of variation for improvement of cultivated wheats. However, undesirable genes can be incorporated into the cultivated varieties from wild relatives. The spontaneous spike shattering caused by the brittle rachis character is of adaptive value in wild grass species, but not in cultivated varieties. The rachis of R-61, which was derived from the cross of T. aestivum cv. Bet Hashita with an accession of Ae.tauschii, was brittle. Using telosomic stocks, the brittle rachis gene Br61 (tentatively designated) of B-61 was located on the short arm of chromosome 3D and the distance of Br61 to the centromere was 31.9 cM. The distance of Br61 from the centromeric marker Xgdm72 was 25.3 cM on the short arm of chromosome 3D. The location of Br61 was similar to Br1 whose location was determined by telosomic mapping and microsatellite mapping. Discrepancy of disarticulation type was found between R-61 and Aegilopstauschii suggesting that the recombination around the regions of Br1 locus and Brt locus created the wedge type disarticulation of R-61.
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Watanabe, N., Fujii, Y., Takesada, N. et al. Cytological and Microsatellite Mapping of the Gene for Brittle Rachis in a Triticum Aestivum-Aegilops Tauschii Introgression Line. Euphytica 151, 63–69 (2006). https://doi.org/10.1007/s10681-006-9128-1
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DOI: https://doi.org/10.1007/s10681-006-9128-1