Abstract
Genomic in situ hybridization (GISH) with Secale cereale cv. ‘Jingzhou rye’ DNA as a probe to chromosomes of hexaploid triticale line Fenzhi-1 revealed that not only were all chromosomes of rye strongly hybridized along the entire chromosome length, but there were also stronger signals in terminal or subtelomeric regions. This pattern of hybridization signals is referred to as GISH banding. After GISH banding, sequential fluorescene in situ hybridizaion (FISH) with tandem repeated sequence pSc200 and pSc250 as probes showed that the chromosomal distribution of pSc200 is highly coincident with the GISH banding pattern, suggesting that GISH banding revealed chromosomal distribution of pSc200 in rye. In addition, FISH using pSc200 and pSc250 as probes to chromosomes of 11 species of the genus Secale and two artificial amphiploids (Triticum aestivum-S. strictum subsp. africanum amphiploid and Aegilops tauschii-S. silvestre amphiploid) showed that (1) the chromosomal distribution of pSc200 and pSc250 differed greatly in Secale species, and the trend towards an increase in pSc200 and pSc250 binding sites from wild species to cultivated rye suggested that pSc200 and pSc250 sequences gradually accumulated during Secale evolution; (2) the chromosomal distribution of pSc200 and pSc250 presented polymorphism on homologous chromosomes, suggesting that the same species has two heterogeneous homologous chromosomes; (3) the intensity and number of hybridization signals varied differently on chromosomes between pSc200 and pSc250, suggesting that each repetitive family evolved independently.
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Acknowledgments
We are thankful to the National Natural Science Foundation of China for their financial support (No. 30800685 and No. 30730065) and we appreciate Dr. Frank Blattner and Dr. Bernd R. Friebe for their help in revising this paper.
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Zhou, J., Yang, Z., Li, G. et al. Diversified chromosomal distribution of tandemly repeated sequences revealed evolutionary trends in Secale (Poaceae). Plant Syst Evol 287, 49–56 (2010). https://doi.org/10.1007/s00606-010-0288-z
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DOI: https://doi.org/10.1007/s00606-010-0288-z