Journal
MOLECULES
Volume 15, Issue 11, Pages 8241-8250Publisher
MDPI
DOI: 10.3390/molecules15118241
Keywords
Convolvulaceae; Merremia umbellata; phenolic compounds; Arabidopsis; Allelopathic effect; salicylic acid
Funding
- Chinese Academy of Sciences [KSCX2-YW-N-0804, 200733, 200747, 200920]
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization
- South China Botanical Garden
- National Natural Science Foundation of China [30870248, 30900125]
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A bioassay-directed phytochemical study was carried out to investigate potential allelochemicals of the invasive plant Merremia umbellata subsp. orientalis (Hall. f.). Eight phenolic compounds, including a salicylic acid (SA)-derived new natural product, SA 2-O-beta-D-(3', 6'-dicaffeoyl)-glucopyranoside (1), and seven known ones 2-8 were isolated and identified from two bioactive sub-fractions of the acetone extract of this plant. The structure of new compound 1 was established by spectral and chemical methods. The potential allelopathic effects of these compounds at 0.5 and 1.0 mM concentrations on the germination of Arabidopsis seeds were tested. Results showed that 2 remarkably inhibited seed germination at concentrations as low as 0.5 mM. Compound 3 only moderately inhibited seed germination at 0.5 mM, but displayed strong inhibitory bioactivity at 1.0 mM concentration. Compounds 4 and 5 showed only slight inhibitory bioactivity at 1.0 mM, while the other compounds showed no obvious inhibitory effects.
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