Breeding, Hybridizing calcicola x cantabricus by Ben Zonneveld, the Netherlands • October 13, 2008 • Comments Off on calcicola x cantabricus Hi Brian I suppose that the result of the cross N. calcicola with a nuclear DNA content of 26.6 pg and cantabricus with 14.5 pg will be sterile. Even when using the tetraploid cantabricus with 29 pg as this would give triploid offspring. Institute of Molecular Plant Sciences Clusius laboratory PBox 9505 2300RA Leiden The Netherlands