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Chromosome numbers and ploidy levels of Paspalum species from subtropical South America (Poaceae)

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Abstract

Somatic chromosome numbers of 131 accessions belonging to 55 Paspalum species from subtropical South America have been determined. All species had x = 10 as a basic chromosome number, except P. almum which had x = 6. Six ploidy levels were found among species with tetraploidy as the most frequent condition. New diploid and octoploid counts were reported. For Paspalum lilloi and P. glabrinode (both 2n = 2x = 20), and for P. ellipticum, P. erianthoides, P. ovale and P. remotum (all 2n = 8x = 80) sporophytic chromosome numbers are presented for the first time. Records that differ from previously reported counts are given for the following species: P. paucifolium (2n = 2x = 20), P. ceresia (2n = 6x = 60), P. conjugatum (2n = 6x = 60), P. alcalinum (2n = 6x = 60) and P. aff. arundinellum (2n + 1 = 5+ 1 = 51). These chromosome data are discussed in light of ploidy-level variation and implications for breeding systems within and among species.

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Acknowledgements

We are grateful to Dr. J. Guillermo Seijo and Dr. Viviana Solís Neffa, who kindly provided us some specimens from northwestern Argentina. Also, the authors give thanks to researchers from FACEN-UNA, Paraguay for their assistance in the collection of some specimens. This study was supported in part by grants BID 1728/OC-AR, PICT-O Nº 36907 (SECyT—Argentina), and JG21 (UBA—Argentina).

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Hojsgaard, D., Honfi, A.I., Rua, G. et al. Chromosome numbers and ploidy levels of Paspalum species from subtropical South America (Poaceae). Genet Resour Crop Evol 56, 533–545 (2009). https://doi.org/10.1007/s10722-008-9384-0

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