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Background  Rice ( Oryza sativa ) is critical for human nutrition worldwide. Due to a growing population, cultivars that produce high yields in high salinity soil are of major importance. Here we describe the discovery and molecular characterization of a novel sea water adapted rice strain, Sea Rice 86 (SR86).    Results  SR86 can produce nutritious grains when grown in high salinity soil. Compared to a salt resistant rice cultivar, Yanfen 47 (YF47), SR86 grows in environments with up to 3X the salt content, and produces grains with significantly higher nutrient content in 12 measured components, including 2.9X calcium and 20X dietary fiber. Whole genome sequencing demonstrated that SR86 is a relatively ancient  indica  subspecies, phylogenetically close to the divergence point of the major rice varietals. SR86 has 12 chromosomes with a total genome size of 373,130,791 bps, slightly smaller than other sequenced rice genomes. Via comparison with 3000 rice genomes, we identified 42,359 putative unique, high impact variants in SR86. Transcriptome analysis of SR86 grown under normal and high saline conditions identified a large number of differentially expressed and salt-induced genes. Many of those genes fall into several gene families that have established or suggested roles in salt tolerance, while others represent potentially novel mediators of salt adaptation.    Conclusions  Whole genome sequencing and transcriptome analysis of SR86 has laid a foundation for further molecular characterization of several desirable traits in this novel rice cultivar. A number of candidate genes related to salt adaptation identified in this study will be valuable for further functional investigation.    Electronic supplementary material  The online version of this article (doi:10.1186/s12864-017-4037-3) contains supplementary material, which is available to authorized users.

Whole genome sequencing and comparative transcriptome analysis of a novel seawater adapted, salt-resistant rice cultivar – sea rice 86