Abstract
The genus Dasypyrum contains two species: the annual and widespread D. villosum (2x = 2n = 14) and the perennial and generally rare D. breviaristatum (2x = 2n = 14 and 4x = 2n = 28). The origin of the latter and its genome constitution have been subject of several studies. There is agreement that the genome of the diploid D. villosum (VV) is different from the diploid cytotype of D. breviaristatum (VbVb), but there is no agreement of the constitution of the tetraploid cytotype, specifically whether is it an autotetraploid or an allotetraploid. This is a long-standing disagreement that this study aims to resolve using the 5S nrDNA as a genomic marker. Our studies suggest that the 4x D. breviaristatum is an allotetraploid (VVVbVb).
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Acknowledgments
We thank Dr. Shoji Ohta; Plant Germplasm Institute, Faculty of Agriculture, Kyoto University, Japan, for sending us material of Dasypyrum breviaristatum that also included the identified diploid and tetraploid cytotypes. We also thank the two referees for helpful suggestions and D. Laczko for technical assistance. This research was funded in part by grants from the Natural Sciences and Engineering Research Council of Canada and the University of Ottawa, Research Development Program to D. A. J.
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Communicated by D. Tian.
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Baum BR, Edwards T, Johnson DA XXXX What does the nr5S DNA multigene family tell us about the genomic relationship between Dasypyrum breviaristatum and D. villosum (Triticeae: Poaceae)?
438_2014_825_MOESM1_ESM.pdf
Supplementary material Fig. S1.Sequence alignment of the Long V1 unit class in the Dasypyrum study. DV = Dasypyrum villosum; DB = Dasypyrum breviaristatum. Sequence label prefix: 2 = diploid, 4 = tetraploid. (PDF 8 kb)
438_2014_825_MOESM2_ESM.pdf
Supplementary material Fig.S2. Circular phylogram to complement Fig. 1. In this rendition the labels of the sequences are made clearer and along with the unit classes that were visually defined in the alignments. Disposition of the four unit classes follows. Long V1: starting from 2XDB1454_11 to DB1455_6; Long Vb1: from DB1456_10 to DB1427_11; Short Vb1: from DB1460_21 to DB1460_5; and Short V1: DB746_6 to DV748_16. (PDF 125 kb)
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Baum, B.R., Edwards, T. & Johnson, D.A. What does the nr5S DNA multigene family tell us about the genomic relationship between Dasypyrum breviaristatum and D. villosum (Triticeae: Poaceae)?. Mol Genet Genomics 289, 553–565 (2014). https://doi.org/10.1007/s00438-014-0825-5
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DOI: https://doi.org/10.1007/s00438-014-0825-5