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Absract  Peanut ( Arachis hypogaea L .) is an important oilseed and cash crop worldwide. Wild  Arachis  spp. are potental sources of novel genes for the genetic improvement of cultivated peanut. Understanding the genetic relationships with cultivated peanut is important for the efficient use of wild species in breeding programmes. However, for this genus, only a few genetic resources have been explored so far. In this study, new chloroplast genomic resources have been developed for the genus  Arachis  based on whole chloroplast genomes from seven species that were sequenced using next-generation sequencing technologies. The chloroplast genomes ranged in length from 156,275 to 156,395 bp, and their gene contents, gene orders, and GC contents were similar to those for other Fabaceae species. Comparative analyses among the seven chloroplast genomes revealed 643 variable sites that included 212 singletons and 431 parsimony-informative sites. We also identified 101 SSR loci and 85 indel mutation events. Thirty-seven SSR loci were found to be polymorphic by  in silico  comparative analyses. Eleven highly divergent DNA regions, suitable for phylogenetic and species identification, were detected in the seven chloroplast genomes. A molecular phylogeny based on the complete chloroplast genome sequences provided the best resolution of the seven  Arachis  species.

Development of chloroplast genome resources for peanut (Arachis hypogaea L.) and other species of Arachis