| Autor: |
da Silva Pereira G; Department of Horticultural Science, North Carolina State University, Raleigh, NC, USA. g.pereira@ufv.br.; Bioinformatics Research Center, North Carolina State University, Raleigh, NC, USA. g.pereira@ufv.br.; Department of Agronomy, Federal University of Viçosa, Viçosa, Brazil. g.pereira@ufv.br., Mollinari M; Department of Horticultural Science, North Carolina State University, Raleigh, NC, USA.; Bioinformatics Research Center, North Carolina State University, Raleigh, NC, USA., Schumann MJ; Department of Horticultural Science, North Carolina State University, Raleigh, NC, USA.; Bayer Crop Science, Chesterfield, MO, USA., Clough ME; Department of Horticultural Science, North Carolina State University, Raleigh, NC, USA.; Vernon G. James Research and Extension Center, Department of Horticultural Science, North Carolina State University, Plymouth, NC, USA., Zeng ZB; Department of Horticultural Science, North Carolina State University, Raleigh, NC, USA.; Bioinformatics Research Center, North Carolina State University, Raleigh, NC, USA., Yencho GC; Department of Horticultural Science, North Carolina State University, Raleigh, NC, USA. craig_yencho@ncsu.edu. |
| Abstrakt: |
There are many challenges involved with the genetic analyses of autopolyploid species, such as the tetraploid potato, Solanum tuberosum (2n = 4x = 48). The development of new analytical methods has made it valuable to re-analyze an F 1 population (n = 156) derived from a cross involving 'Atlantic', a widely grown chipping variety in the USA. A fully integrated genetic map with 4285 single nucleotide polymorphisms, spanning 1630 cM, was constructed with MAPpoly software. We observed that bivalent configurations were the most abundant ones (51.0~72.4% depending on parent and linkage group), though multivalent configurations were also observed (2.2~39.2%). Seven traits were evaluated over four years (2006-8 and 2014) and quantitative trait loci (QTL) mapping was carried out using QTLpoly software. Based on a multiple-QTL model approach, we detected 21 QTL for 15 out of 27 trait-year combination phenotypes. A hotspot on linkage group 5 was identified with co-located QTL for maturity, plant yield, specific gravity, and internal heat necrosis resistance evaluated over different years. Additional QTL for specific gravity and dry matter were detected with maturity-corrected phenotypes. Among the genes around QTL peaks, we found those on chromosome 5 that have been previously implicated in maturity (StCDF1) and tuber formation (POTH1). These analyses have the potential to provide insights into the biology and breeding of tetraploid potato and other autopolyploid species. |
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