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Molecules 2010, 15(11), 8241-8250; doi:10.3390/molecules15118241
Article

Phenolic Compounds from Merremia umbellata subsp. orientalis and Their Allelopathic Effects on Arabidopsis Seed Germination

1,†
, 1,†
, 2
, 1,3
, 1
 and 1,*
1 Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China 2 National Engineering Research Center of Plant Space Breeding, Guangzhou 510642, China 3 Graduate School of the Chinese Academy of Sciences, Beijing 100039, China These authors contributed equally to this work.
* Author to whom correspondence should be addressed.
Received: 15 September 2010 / Revised: 27 October 2010 / Accepted: 29 October 2010 / Published: 12 November 2010
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Abstract

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-β-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.
Keywords: Convolvulaceae; Merremia umbellata; phenolic compounds; Arabidopsis; Allelopathic effect; salicylic acid Convolvulaceae; Merremia umbellata; phenolic compounds; Arabidopsis; Allelopathic effect; salicylic acid
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Yan, J.; Bi, H.-H.; Liu, Y.-Z.; Zhang, M.; Zhou, Z.-Y.; Tan, J.-W. Phenolic Compounds from Merremia umbellata subsp. orientalis and Their Allelopathic Effects on Arabidopsis Seed Germination. Molecules 2010, 15, 8241-8250.

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