Alginate oligosaccharides (AOS) have various biological activities in the regulation of plant growth and development. However, little is known about the effect on fruit coloration. We assessed the impacts of varying Mannuronate/Guluronate ratio (M/G ratios) of AOS, namely oligoguluronate (GAOS), oligomannuronate (MAOS), and heterogeneous AOS (HAOS), and delved into the structure-function relationship, as well as the mechanisms of regulation. The promotion of strawberry coloration was observed in HAOS (M/G ratio ≈ 1.58; Mw = 2800 Da) and MAOS (M/G ratio ≈ 6.77; Mw = 6000 Da), whereas GAOS (M/G ratio ≈ 0.2; Mw = 5500 Da) did not exhibit any significant effect. The metabolomics analysis revealed that the impact of AOS was predominantly observed on the biosynthesis of flavonoids. The predominant flavonoids present in strawberries were anthocyanins. The application of HAOS and MAOS on strawberries increased anthocyanin content. This was accompanied by an up-regulation of genes related to the JA synthesis pathway. Additionally, transcription factors and structural genes related to anthocyanin synthesis and transport were up-regulated. The findings suggest that HAOS and MAOS may trigger the JA pathway, leading to an elevation in anthocyanin metabolism and consequent enhancement of strawberry coloration.
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