The nutrient-rich tubers of the greater yam,
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Abstract Dioscorea alata L., provide food and income security for millions of people around the world. Despite its global importance, however, greater yam remains an orphan crop. Here, we address this resource gap by presenting a highly contiguous chromosome-scale genome assembly ofD. alata combined with a dense genetic map derived from African breeding populations. The genome sequence reveals an ancient allotetraploidization in theDioscorea lineage, followed by extensive genome-wide reorganization. Using the genomic tools, we find quantitative trait loci for resistance to anthracnose, a damaging fungal pathogen of yam, and several tuber quality traits. Genomic analysis of breeding lines reveals both extensive inbreeding as well as regions of extensive heterozygosity that may represent interspecific introgression during domestication. These tools and insights will enable yam breeders to unlock the potential of this staple crop and take full advantage of its adaptability to varied environments. -
Said, Mahmoud ; Hřibová, Eva ; Danilova, Tatiana V. ; Karafiátová, Miroslava ; Čížková, Jana ; Friebe, Bernd ; Doležel, Jaroslav ; Gill, Bikram S. ; Vrána, Jan ( , Theoretical and Applied Genetics)