Abstract
Paspalum notatum Flügge is a warm-season forage grass with mainly diploid (2n = 20) and autotetraploid (2n = 40) representatives. Diploid races reproduce sexually and require crosspollination due to a self-incompatible mating system, while autotetraploids reproduce by aposporous apomixis. The objectives of this work were to develop a genetic linkage map of Paspalum notatum Flügge at the tetraploid level, identify the linkage/s group/s associated with apomixis and carry out a general characterization of its mode of inheritance. A pseudo test-cross F1 family of 113 individuals segregating for the mode of reproduction was obtained by crossing a synthetic completely sexual tetraploid plant (Q4188) as female parent with a natural aposporous individual (Q4117) as pollen donor. Map construction was based on single-dose markers (SDAFs) segregating from both parents. Two linkage maps (female and male) were constructed. Within each map, homologous groups were assembled by detecting repulsion-phase linked SDAFs. Putative Q4188 and Q4117 homolog groups were identified by mapping shared single dose markers (BSDF). The Q4188 map consisted of 263 markers distributed on 26 co-segregation groups over a total genetic distance of 1.590.6 cM, while the Q4117 map contained 216 loci dispersed on 39 co-segregation groups along 2.265.7 cM, giving an estimated genome coverage of 88% and 83%, respectively. Seven and 12 putative homologous chromosomes were detected within Q4188 and Q4117 maps, respectively. Afterward, ten female and male homologous chromosomes were identified by mapping BSDFs. In the Q4117 map, a single linkage group was associated with apospory. It was characterized by restriction in recombination and preferential chromosome pairing. A BPSD marker mapping within this group allowed the detection of the female homolog and the putative four male groups of the set carrying apospory.
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Acknowledgements
Authors wish to thank to Glaucia Cabral and Dr. Vera Tavares de Campos Carneiro, EMBRAPA Cenargen-Brazil for providing the cDNA probes from Brachiaria sp. We thank Ing. Florencia Galdeano for her technical assistance. This study was financed by the Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT), Argentina, PICT N° 13578 and PAV 137/3. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina, PIP No. 6805. Centro Argentino Brasilero de Biotecnología (CABBIO 2003 No. 012). J. Stein and MP Rodriguez received fellowships from CONICET and ANPCyT, respectively. EJ Martínez, SC Pessino, CL Quarin and JPA Ortiz are career members of CONICET.
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Stein, J., Pessino, S.C., Martínez, E.J. et al. A genetic map of tetraploid Paspalum notatum Flügge (bahiagrass) based on single-dose molecular markers. Mol Breeding 20, 153–166 (2007). https://doi.org/10.1007/s11032-007-9083-0
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DOI: https://doi.org/10.1007/s11032-007-9083-0