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Mexican propolis flavonoids affect photosynthesis and seedling growth

Paper ID Volume ID Publish Year Pages File Format Full-Text
30236 44465 2015 8 PDF Available
Title
Mexican propolis flavonoids affect photosynthesis and seedling growth
Abstract

•Flavonoids isolated from Mexican propolis were identified by NMR and mass techniques.•Acacetin acts as an uncoupler on spinach leaves chloroplasts.•Chrysin and 4′,7-dimethylnarangenin inhibit the PS II acceptor side of photosynthesis.•Acacetin, chrysin and 4′,7-dimethylnarangenin are inhibitors of seedling growth.

As a continuous effort to find new natural products with potential herbicide activity, flavonoids acacetin (1), chrysin (2) and 4′,7-dimethylnarangenin (3) were isolated from a propolis sample collected in the rural area of Mexico City and their effects on the photosynthesis light reactions and on the growth of Lolium perenne, Echinochloa crus-galli and Physalis ixocarpa seedlings were investigated. Acacetin (1) acted as an uncoupler by enhancing the electron transport under basal and phosphorylating conditions and the Mg2+-ATPase. Chrysin (2) at low concentrations behaved as an uncoupler and at concentrations up to 100 μM its behavior was as a Hill reaction inhibitor. Finally, 4′,7-dimethylnarangenin (3) in a concentration-dependent manner behaved as a Hill reaction inhibitor. Flavonoids 2 and 3 inhibited the uncoupled photosystem II reaction measured from water to 2,5-dichloro-1,4-benzoquinone (DCBQ), and they did not inhibit the uncoupled partial reactions measured from water to sodium silicomolybdate (SiMo) and from diphenylcarbazide (DPC) to diclorophenol indophenol (DCPIP). These results indicated that chrysin and 4′,7-dimethylnarangenin inhibited the acceptor side of PS II. The results were corroborated with fluorescence of chlorophyll a measurements. Flavonoids also showed activity on the growth of seedlings of Lolium perenne and Echinochloa crus-galli.

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Keywords
Acacetin; Chrysin; 4′,7-dimethylnarangenin; Photosynthesis; Propolis; Seedling growth
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 151, October 2015, Pages 213–220
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us