Abstract
A new CMS system designated as ‘msH1’ has been reported in bread wheat using the cytoplasm of H. chilense. While testing this system in different wheat backgrounds, a highly fertile line with chromosome number 42 plus an extra acrocentric chromosome was obtained. The extra chromosome did not pair with any wheat chromosome at meiosis, and progeny from this line which lack the acrocentric chromosome showed pollen abortion and male sterility. In order to establish the origin of this chromosome, FISH using H. chilense genomic DNA as probe was used and showed that it had originated from H. chilense chromosome(s). The novel chromosome did not possess sequences similar to wheat rDNA; however, the probe pSc119.2 from S. cereale containing the 120 bp family was found to occur at the end of its long arm. Data obtained from FISH and EST molecular markers confirm that the long arm of the acrocentric chromosome is indeed, the short arm of chromosome 1Hch from H. chilense. We suggest that the novel chromosome originated from a deletion of the distal part of the long arm of chromosome 1Hch. Neither the 1HchS short arm, nor the whole chromosome 1Hch restores pollen fertility of the alloplasmic wheat. Therefore, the restorer gene on the acrocentric chromosome must be located on the retained segment from the hypothetical 1HchL, while some pollen fertility inhibitor could be present on the deleted 1HchL distal segment. Disomic addition of the acrocentric chromosome was obtained and this line resulted fully stable and fertile.
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This work was supported by MICINN (Ministerio de Ciencia e Innovación) project AGL2007-65685-C02-01 and AGL2009-11359 of the Spanish Government.
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Communicated by B. Friebe.
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Martín, A.C., Atienza, S.G., Ramírez, M.C. et al. Molecular and cytological characterization of an extra acrocentric chromosome that restores male fertility of wheat in the msH1 CMS system. Theor Appl Genet 121, 1093–1101 (2010). https://doi.org/10.1007/s00122-010-1374-x
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DOI: https://doi.org/10.1007/s00122-010-1374-x