ArticleBMC plant biology2026
Integrated transcriptomic and metabolomic analyses identify OsCGT as essential for C-glycosyl flavone biosynthesis in OsDET1-mutant rice seeds.
Article in BMC plant biology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundC-glycosyl flavones rarely accumulate at high levels in rice seeds, and the genetic basis underlying their biosynthesis and regulation remains poorly understood. The rice yel-sdj mutant, carrying a mutation in DE-ETIOLATED 1 (OsDET1), shows elevated accumulation of C-glycosyl flavones in the embryo and pericarp, providing a useful system for dissecting the molecular mechanisms controlling these metabolites. Here, we performed comparative transcriptomic and metabolomic analyses, together with genome-editing-based functional validation, to identify key genes involved in C-glycosyl flavone biosynthesis in rice seeds.
resultsTranscriptomic profiling of developing seeds revealed that differentially expressed genes (DEGs) between wild-type and yel-sdj were significantly enriched in secondary metabolite and flavonoid biosynthetic pathways. Several genes associated with C-glycosyl flavone biosynthesis, including the rice C-glycosyltransferase (OsCGT), were upregulated in developing yel-sdj grains. To validate its function, we generated OsCGT knockout lines in the yel-sdj background. Loss of OsCGT markedly reduced the accumulation of C-glycosyl flavones, particularly isoorientin, in the embryo and restored embryo coloration to a wild-type-like phenotype. In contrast, despite the significant reduction in C-glycosyl flavone accumulation, pericarp pigmentation was not obviously altered, and embryo lethality was not rescued.
conclusionsThese findings demonstrate that OsCGT is essential for C-glycosyl flavone biosynthesis in yel-sdj seeds, particularly for isoorientin accumulation in the embryo, and indicate that embryo lethality is a fundamental consequence of the OsDET1 mutation rather than OsCGT-dependent flavone accumulation. This study expands current understanding of flavonoid regulation in rice seeds and identifies OsCGT as a potential target for metabolic engineering to improve the nutraceutical and functional value of rice grains.
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