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Phytotoxins from Tithonia diversifolia

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URI: http://hdl.handle.net/10498/20317

DOI: 10.1021/acs.jnatprod.5b00040

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2015-Phytotoxins from Tithonia diversifolia.pdf (3.080Mb)
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Author/s
M.Miranda, Maria A. F.; J. Gualtieri, Sonia C.; Varela Montoya, Rosa MaríaAuthority UCA; Torres Martínez, AscensiónAuthority UCA; González Molinillo, José MaríaAuthority UCA; Macías Domínguez, Francisco AntonioAuthority UCA
Date
2015-04
Department
Química Orgánica
Source
J. Nat. Prod. 2015, 78, 1083−1092
Abstract
Tithonia diversifolia (Mexican sunflower) is a dominant plant of the Asteraceae family, which suggests it produces allelochemicals that interfere with the development of surrounding plants. The study described herein was conducted to identify the compounds that have phytotoxic activity in T. diversifolia extracts. Ethyl acetate extracts of the leaves, stems, and roots showed significant inhibition of wheat coleoptile growth, and the leaf extract had similar inhibitory effects to a commercial herbicide. Fourteen compounds, 12 of which were sesquiterpene lactones, have been isolated. Two sesquiterpene lactones are reported for the first time and were isolated as an inseparable mixture of 8β-O-(2-methylbutyroyl)- tirotundin (4) and 8β-O-(isovaleroyl)tirotundin (5). Their structures were determined by spectroscopic analysis, including NMR techniques and mass spectrometry. The sesquiterpene lactones 1β methoxydiversifolin (6), tagitinin A (7), and tagitinin C (8) were the major products identified. These compounds were active on etiolated wheat coleoptiles, seed germination, and the growth of STS and weeds. The phytotoxic activity shown by these sesquiterpene lactones indicates that they are the compounds responsible for the activity exhibited by the initial extracts.
Subjects
Phytotoxins; tithonia diversifolia; Phytotoxic activity; sesquiterpene lactones
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  • Artículos Científicos INBIO [269]
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Attribution-NonCommercial-NoDerivatives 4.0 Internacional
This work is under a Creative Commons License Attribution-NonCommercial-NoDerivatives 4.0 Internacional

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