Chromosome-level genome assembly of the wild Chinese yam Dioscorea opposita.

Authors

Tiegang Yang, Huijun Wang, Peng Wang, Yulong Zhao, Xiangyang Li, Guixia Shi, Tiejun Guo, Jie Tang, Guixiao La

Published in

Scientific data. Volume 13. Issue 1. May 02, 2026. Epub May 02, 2026.

Abstract

Dioscorea opposita, a perennial dioecious vine endemic to East Asia, holds substantial economic value owing to its dual role as a source of both food and traditional medicine. In this study, we constructed a high-quality, chromosome-level reference genome for this species by integrating PacBio, BGI, and Hi-C sequencing technologies. The assembled haploid genome is approximately 430.73 Mb, 94.33% of the sequences were anchored onto 20 pseudochromosomes. Our analysis confirmed that this species not only underwent a recent hexaploidization event (2n = 6x = 120), but also carried genomic signatures originating from earlier polyploidization events. We annotated 24,960 protein-coding genes, of which 93.58% were functionally annotated. Repetitive sequences accounted for 65.93% of the genome, with LTR elements being the most abundant component (48.00%). BUSCO confirmed high completeness of both the genome assembly and gene annotation. This genomic resource provides a crucial reference for studying sex determination, adaptive evolution, and genomic diversity within Dioscorea and lays a solid foundation for genetic improvement, germplasm conservation, and sustainable utilization of this key plant.

PMID:
42069708
Bibliographic data and abstract were imported from PubMed on 15 Aug 2026.

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