Phyllospadix iwatensis is a unique seagrass species adapted to rocky substrate anchorage and dioecy and belongs to marine submerged flowering plants with a distinctive evolutionary history. The chromosomal-scale genome was constructed by integrating Illumina, PacBio HiFi, and high-throughput chromosome conformation capture (Hi-C) sequencing techniques. A total of 340.56 Mb of sequences were anchored to 10 chromosomes with an anchoring rate of 96.44%. The contig and scaffold N50 values reached 30.64 Mb and 33.59 Mb, respectively. Precisely 94.64% of the 23,198 predicted protein-coding genes received functional annotation. In the meantime, 180.19 Mb of repetitive sequences were found, representing 52.91% of the assembled genome. The chromosomal-level genome data of P. iwatensis will reveal its special process of differentiation and enrich the understanding of the multiple adaptations of seagrass populations to marine habitats.
Wang et al. (Thu,) studied this question.