Genome in situ hybridization (GISH) analysis of wheat-Secale africanum amphiploid revealed that the S. africanum genome displayed significant divergence to the Secale cereale genome. It is thus valuable to deploy genes from S. africanum. We performed the PCR analysis on S. africanum, wheat-S. afticanum amphiploid, T. eastivum cv. Anyuepaideng and other genetic stocks by 100 ISSR primers. A specific segment of 561 bp, named pSaUBC815561, was obtained from S. africanum using primer UBC815. This segment was not amplified from the control wheat lines. Primer UBC815 also am-plified fragments from wild species of genus Secale, including S. vavilovii, S. sylvestre, and other cultivated ryes. Based on the sequence of pSaUBC815561, a pair of special primers U815-F and U815-R was designed and was used to amplify the DNA of wheat related species in Triticeae aimed at validating the specificity of pSaUBC815561. PCR analysis indicated that this specific DNA fragment was amplified not only from a set of Chinese Spring wheat-Imperial rye chromosome addition lines but also from certain wheat-rye introgression lines. Therefore, pSaUBC815561 can be used as a specific marker for detection of chromosomes of Secale genome in wheat.
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