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Nuclear DNA content in allopolyploid species and synthetic hybrids in the grass genus Paspalum

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Abstract

DNA content was estimated by flow cytometry in seventeen taxa from the Dilatata, Quadrifaria and Paniculata groups of Paspalum and five synthetic hybrids. Results were compared to known genome constitutions and phylogenetic relationships. DNA 2C-values ranged from 1.24 pg in diploid P. juergensii to 3.79 pg in a hexaploid biotype of P. dilatatum. The I genome of three Quadrifaria diploids is 1.2 to 1.5-fold larger than the J genome of P. juergensii (Paniculata). The 2C-values of the IIJJ tetraploids of the Dilatata group are lower than expected based on putative genome donors. Reduction of genome sizes could have occurred after the formation of the allopolyploids of the Dilatata group. The DNA content of all synthetic hybrids is in accordance with the sum of parental C-values. The interactions driving genome downsizing may operate differently during the transition from diploidy to polyploidy than on subsequent increases in ploidy level.

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  1. Departamento de Biología Vegetal, Facultad de Agronomía, Universidad de la República, Av. E. Garzón 780, CP, 12900, Montevideo, Uruguay

    M. Vaio, C. Mazzella, P. Speranza & E. Estramil

  2. Flow Cytometry and Cell Sorting Core, Institute of Biological Research Clemente Estable (IIBCE), Av. Italia 3318, CP, 11600, Montevideo, Uruguay

    V. Porro, B. López-Carro & G. A. Folle

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  1. M. Vaio
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Vaio, M., Mazzella, C., Porro, V. et al. Nuclear DNA content in allopolyploid species and synthetic hybrids in the grass genus Paspalum . Plant Syst. Evol. 265, 109–121 (2007). https://doi.org/10.1007/s00606-006-0506-x

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