The harvesting period is a critical period for the accumulation of flavonoids in the leaves of the important medicinal plant . In this study, we conducted an experiment on leaves sprayed with mineral elements with the aim of improving the quality of the herbal leafage during the harvesting period. We elucidated the changes in flavonoids (icariin, epimedin A, epimedin B, and epimedin C) in leaves. The sum of main flavonoids content reached a maximum (11.74%) at 20 days after the high-concentration Fe (2500 mg·L) treatment. We analyzed the FT-IR spectra characteristics of leaf samples using the FT-IR technique, and constructed an OPLS-DA model and identified characteristic peaks to achieve differentiated identification of . Further, widely untargeted metabolomic analysis identified different classes of metabolites. As the most important characteristic flavonoids, the relative contents of icariin, icaritin, icariside I, and icariside II were found to be up-regulated by high-Fe treatment. Our experimental results demonstrate that high-concentration Fe treatment is an effective measure to increase the flavonoids content in leaves during the harvesting period, which can provide a scientific basis for the improvement of leaf cultivation agronomic measures.
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| http://dx.doi.org/10.3390/metabo13020294 | DOI Listing |
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