Abstract
Honeysuckle, a key traditional Chinese medicinal herb, holds significant economic and therapeutic value. However, its three flowering stages lack clarity in component differentiation, leading to resource waste. Furthermore, the plant is consistently challenged by powdery mildew caused by Erysiphe lonicerae during cultivation. This study demonstrates that E. lonicerae reduces the flowering period from 12.4 to 8.6 days and alters the expression of two key flowering genes. However, foliar application of 0.1 % KH₂PO₄ three times weekly effectively mitigates the reduction in flowering duration. Initiating treatment at least one month prior to E. lonicerae inoculation significantly reduces the disease's impact, with earlier treatments proving more effective. Further, A comprehensive analysis of the three floral stages revealed significant metabolite and enzyme activity differences. We identified 175 differentially expressed metabolites (DEMs) between gold flowers and buds, 60 between gold and silver flowers, and 162 between buds and silver flowers, particularly in lipids, phenylpropanoids, and polyketides. Enzyme activities of PPD, SOD, PPO, and PAL, along with flavonoid content and antioxidant capacity, varied significantly across these stages. Notably, a total of 13 medicinal compounds were uniquely distributed across the floral stages, indicating that these compounds are not concentrated solely in the buds.In summary, The prophylactic use of KH₂PO₄ can effectively reduce the damage caused by E. lonicerae.The distinct metabolic profiles of the buds, silver flowers, and gold flowers highlight the need for further research into their optimal medicinal applications.
Published Version
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