Genome sequence of white lupin, a model to study root developmental adaptations
Résumé
White lupin ( Lupinus albus ; 2n=50) stands out as a model legume species since it is the only crop producing cluster roots, one of the most outstanding developmental adaptations to nutrient‐scarce environments. We report a high‐quality chromosome‐scale assembly of white lupin genome, together with an extensive transcriptome data from ten different organs of that species. We took advantage of single‐molecule real‐time technology, in combination with short‐reads sequencing and optical and genetic maps in order to have a successful assembly. The final assembly size is 451Mb with a N50 of 17Mb. About 96% (434Mb) of the assembled genome is included on the 25 pseudo‐chromosomes. The structural annotation identified 38 258 coding genes and 3129 ncRNA, being 97.3% genes anchored on the pseudo‐chromosomes. A majority (94.6%) of the 1440 genes in the Plantae BUSCO dataset were identified in the annotation, which is suggestive of a complete assembly and annotation. White lupin genome revealed to be laden with gene duplications and repetitive elements. It presents extensive duplication blocks inside its own genome and also a high degree of synteny with the close legumes species Lupinus angustifolious and Medicago truncatula . This genome is a valuable resource and represents a keystone for legumes genomics research.