Spore mushroom
![spore mushroom spore mushroom](http://www.woodz.co/wp-content/uploads/2016/04/Mushroom-Spores-Can-Make-It-Rain-2.jpg)
burnettii homokaryon and thus segregating both for CO and BSN. We propose to use two genetically unrelated mapping populations both offspring of a cross between a var. The hurdles encountered are discussed and a new strategy is proposed that can solves these. Nevertheless, this was done, and we were able to map three QTLs for this trait, two on chromosome 1 and one on chromosome 2 not overlapping with the QTL for BSN. This phenotype can only be assessed in the meiotic offspring of an intervarietal hybrid which is a laborious and difficult task.
![spore mushroom spore mushroom](http://www.storytrender.com/wp-content/uploads/2018/01/7_CATERS_PUFFER_MUSHROOMS_08.jpg)
It appeared, however, difficult to map the recombination landscape. For BSN, in total seven QTL were found with the major QTL on chromosome 1 explaining ca. Knowledge on genes controlling CO positions might facilitate either the conservation of favorable allele combinations or the disruption of unwanted allele combinations to reduce linkage drag. The two varieties are compatible, and this has been used to study segregation of the basidial spore number (BSN) and the genomic positions of recombination, i.e., the CO landscape, in order to find the underlying genetic determinants. Both varieties also differ in their recombination landscape with the former showing crossovers (CO) predominantly at chromosome ends whereas the latter has a more evenly distribution of CO over the chromosomes. The button mushroom Agaricus bisporus is represented mainly by two varieties, a secondarily homothallic variety with predominantly two heterokaryotic spores per basidia and a heterothallic variety with predominantly four homokaryotic spored basidium.
![spore mushroom spore mushroom](https://i.ytimg.com/vi/-bzCOxQucrg/hqdefault.jpg)
Plant Breeding, Wageningen University and Research, Wageningen, Netherlands.Sonnenberg * †, Narges Sedaghat-Telgerd † ‡, Brian Lavrijssen, Patrick M.