Abstract
Haynaldia villosa (L.) is a wild relative species of common wheat that possesses many beneficial genes that can be used for wheat improvement. The accurate detection of H. villosa chromosomes in the genetic background of wheat is critical for transferring its beneficial genes to common wheat by chromosome engineering. The aim of the present study was to investigate the distribution patterns of two repeated DNA sequences, pSc119.2 and pAs1, as well as two rDNA multigene family sequences, 45S rDNA and 5S rDNA, in the individual chromosomes of H. villosa for the future precise identification of alien chromatin in germplasm development and breeding programs. A set of common wheat-H. villosa disomic addition 1V-7V lines was used to determine these specific signals on individual chromosomes of H. villosa. The results showed that two rDNA probes, pTa71 (45S rDNA) and pTa794 (5S rDNA), were located on 1VS and 5VS, respectively, and the signal could be discriminated exclusively in the common wheat background as effective markers of 1VS and 5VS. Furthermore, all seven chromosomes of H. villosa could be distinguished clearly by fluorescence in situ hybridization using pSc119.2 and pAs1 as probes in combination. The utilization of these cytogenetic markers of repetitive sequences, combined with other molecular markers sometimes, will make it possible for a precise identification of alien chromosomes with high efficiency.
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Zhang, W., Zhang, R., Feng, Y. et al. Distribution of highly repeated DNA sequences in Haynaldia villosa and its application in the identification of alien chromatin. Chin. Sci. Bull. 58, 890–897 (2013). https://doi.org/10.1007/s11434-012-5598-9
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DOI: https://doi.org/10.1007/s11434-012-5598-9