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Hazy weather significantly increase air pollution and affect light intensity which may also affect medicinal plants growth. Syringa oblata Lindl. (S. oblata), an effective anti-biofilm medicinal plants, is also vulnerable to changes in plant photoperiods and other abiotic stress responses. Rutin, one of the flavonoids, is the main bioactive ingredient in S. oblata that inhibits Streptococcus suis biofilm formation. Thus, the present study aims to explore the biosynthesis and molecular basis of flavonoids in S. oblata in response to different light intensity.

In this study, it was shown that compared with natural (Z₀) and 25% ~ 35% (Z₂) light intensities, the rutin content of S. oblata under 50% ~ 60% (Z₁) light intensity increased significantly. In addition, an integrated analysis of metabolome and transcriptome was performed using light intensity stress …