Journal
JOURNAL OF INTEGRATIVE PLANT BIOLOGY
Volume 65, Issue 6, Pages 1423-1441Publisher
WILEY
DOI: 10.1111/jipb.13459
Keywords
buckwheat; comparative genomics; flavonoid biosynthesis; genome evolution; self-incompatibility
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We report the high-quality genome assembly of common buckwheat and compare it with Tartary buckwheat. The analysis reveals the insertion of repetitive sequences and chromosomal rearrangements in common buckwheat after divergence from Tartary buckwheat. Additionally, gene families involved in stress tolerance and flavonoid biosynthesis show significant expansion in buckwheat, especially common buckwheat. Integrated multi-omics analysis identifies different gene expression patterns related to flavonoid biosynthesis and self-incompatibility between the two buckwheat species. This study provides important resources for future research on flavonoid biosynthesis and self-incompatibility in buckwheat.
Common buckwheat (Fagopyrum esculentum) and Tartary buckwheat (Fagopyrum tataricum), the two most widely cultivated buckwheat species, differ greatly in flavonoid content and reproductive mode. Here, we report the first high-quality and chromosome-level genome assembly of common buckwheat with 1.2 Gb. Comparative genomic analysis revealed that common buckwheat underwent a burst of long terminal repeat retrotransposons insertion accompanied by numerous large chromosome rearrangements after divergence from Tartary buckwheat. Moreover, multiple gene families involved in stress tolerance and flavonoid biosynthesis such as multidrug and toxic compound extrusion (MATE) and chalcone synthase (CHS) underwent significant expansion in buckwheat, especially in common buckwheat. Integrated multi-omics analysis identified high expression of catechin biosynthesis-related genes in flower and seed in common buckwheat and high expression of rutin biosynthesis-related genes in seed in Tartary buckwheat as being important for the differences in flavonoid type and content between these buckwheat species. We also identified a candidate key rutin-degrading enzyme gene (Ft8.2377) that was highly expressed in Tartary buckwheat seed. In addition, we identified a haplotype-resolved candidate locus containing many genes reportedly associated with the development of flower and pollen, which was potentially related to self-incompatibility in common buckwheat. Our study provides important resources facilitating future functional genomics-related research of flavonoid biosynthesis and self-incompatibility in buckwheat.
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