Research Background
Study Overview
A study published in Nature Genetics has provided new insights into the complex genome architecture, evolutionary history, and agronomically important traits of modern sugarcane.
Modern sugarcane is a highly complex allo-autopolyploid crop derived primarily from interspecific hybridization and backcrossing between Saccharum officinarum and Saccharum spontaneum. While S. officinarum contributes high sugar content, S. spontaneum provides valuable characteristics such as stress tolerance and disease resistance.
More than a century of breeding has combined these traits in modern cultivars, but it has also produced an exceptionally complex genome that presents major challenges for genomic research and crop improvement.
Genome Assembly
A Haplotype-Resolved Genome of Modern Sugarcane
In the study, titled The highly allo-autopolyploid modern sugarcane genome and very recent allopolyploidization in Saccharum, researchers investigated the karyotype and genome architecture of the modern sugarcane hybrid XTT22.
By integrating PacBio, Illumina, and Hi-C sequencing data, the researchers generated a haplotype-resolved, chromosome-scale genome assembly spanning 8.84 Gb and comprising 97 chromosomes. This genomic resource enabled the team to distinguish subgenomes derived from S. officinarum and S. spontaneum and revealed the dominance of the S. officinarum-derived subgenome within the hybrid genome.
Research Highlights
Key Findings
Subgenome Architecture and Dominance
The 97-chromosome assembly resolved subgenomes originating from S. officinarum and S. spontaneum and revealed the dominance of the S. officinarum-derived subgenome in the modern sugarcane hybrid.
Genome Shock and Transgressive Traits
The study showed that genome shock influenced transcriptome dynamics during recent allopolyploidization. Analysis of an inbreeding population comprising 192 individuals also helped reveal the genetic basis of transgressive segregation.
Breeding History and a Candidate Gene for Sugar Content
Population genomic analysis of 310 Saccharum accessions clarified the breeding history of modern sugarcane. Genome-wide association studies further identified a potential candidate gene associated with sugar content originating from S. spontaneum.
Scientific Significance
Implications for Sugarcane Research and Breeding
By combining a high-quality, haplotype-resolved genome assembly with transcriptomic, population genomic, and genetic analyses, this study provides a valuable resource for understanding the evolution of highly complex allopolyploid genomes.
The findings also establish a stronger genomic foundation for identifying agronomically important genes and developing molecular breeding strategies aimed at improving sugar yield, stress resistance, and other desirable traits in sugarcane.
BMKGENE Contribution
Supporting Chromosome-Scale Genome Assembly with Hi-C Sequencing
BMKGENE was pleased to support this study by providing Hi-C sequencing services, contributing to the construction of the chromosome-scale sugarcane genome assembly.
Hi-C Sequencing · Chromosome-Scale Genome Assembly
Original Publication
Zhang, J., Qi, Y., Hua, X., et al. The highly allo-autopolyploid modern sugarcane genome and very recent allopolyploidization in Saccharum. Nature Genetics 57, 242–253 (2025). DOI: 10.1038/s41588-024-02033-w.
Post time: Aug-20-2026
