Parental Genome Assemblies of Suyunuo1 Reveal Structural Variation Underlying Edible Waxy Maize Evolution, Superior Hybrid Performance and Yield - Flavor Balance

Summary

This study presents the first high-quality, gap-free genomes of the two parental inbred lines of the widely grown Suyunuo 1 waxy maize hybrid. Through comparative and population genomic analysis, the authors identified substantial structural variation, particularly megabase-scale SVs and transposable element enrichment, that underpin genomic differentiation between waxy and field maize and contribute to heterosis and the balance between yield and sensory quality. The findings provide genomic resources and mechanistic insights for future waxy maize breeding and improvement.

Regional applicability

Waxy maize cultivation is not commercially established in the United Kingdom, so direct agronomic application is limited. However, the genomic methodologies and structural variant discovery approaches are transferable to UK breeding programmes for conventional cereals (wheat, barley) and could inform precision breeding strategies where yield–quality trade-offs are important.

Key measures

Chromosome-level gap-free genome sequences, structural variants (SVs), gene presence–absence variation, knob-repeat expansion, transposable element enrichment, introgression patterns, GWAS associations with yield and flavor-related metabolites

Outcomes reported

The study assembled gap-free genomes of two elite waxy maize inbred lines (Tongxi 5 and Hengbai 522), parents of the Suyunuo 1 hybrid, and identified structural variations contributing to phenotypic diversity, yield traits, and flavor-related metabolites. Comparative genomic analysis revealed genome size variation, megabase-scale structural variants, and differentiation mechanisms between waxy and field maize.

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