Gulypyrones A and B and Phomentrioloxins B and C Produced by Diaporthe gulyae, a Potential Mycoherbicide for Saffron Thistle (Carthamus lanatus)
Article
Article Title | Gulypyrones A and B and Phomentrioloxins B and C Produced by Diaporthe gulyae, a Potential Mycoherbicide for Saffron Thistle (Carthamus lanatus) |
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ERA Journal ID | 40471 |
Article Category | Article |
Authors | Andolfi, Anna (Author), Boari, Angela (Author), Evidente, Marco (Author), Cimmino, Alessio (Author), Vurro, Maurizio (Author), Ash, Gavin (Author) and Evidente, Antonio (Author) |
Journal Title | Journal of Natural Products |
Journal Citation | 78 (4), pp. 623-629 |
Number of Pages | 7 |
Year | Apr 2015 |
Place of Publication | United States |
ISSN | 0163-3864 |
1520-6025 | |
Digital Object Identifier (DOI) | https://doi.org/10.1021/np500570h |
Web Address (URL) | https://pubs.acs.org/doi/10.1021/np500570h |
Abstract | A virulent strain of Diaporthe gulyae, isolated from stem cankers of sunflower and known to be pathogenic to saffron thistle, has been shown to produce both known and previously undescribed metabolites when grown in either static liquid culture or a bioreactor. Together with phomentrioloxin, a phytotoxic geranylcyclohexenetriol recently isolated from a strain of Phomopsis sp., two new phytotoxic trisubstituted α-pyrones, named gulypyrones A and B (1 and 2), and two new 1,O- and 2,O-dehydro derivatives of phomentrioloxin, named phomentrioloxins B and C (3 and 4), were isolated from the liquid culture filtrates of D. gulyae. These four metabolites were characterized as 6-[(2S)2-hydroxy-1-methylpropyl]-4-methoxy-5-methylpyran-2-one (1), 6-[(1E)-3-hydroxy-1-methylpropenyl]- 4-methoxy-3-methylpyran-2-one (2), 4,6-dihydroxy-5-methoxy-2-(7-methyl-3-methyleneoct-6-en-1-ynyl)cyclohex-2-enone (3), and 2,5-dihydroxy-6-methoxy-3-(7-methyl-3-methyleneoct-6-en-1-ynyl)cyclohex-3-enone (4) using spectroscopic and chemical methods. The absolute configuration of the hydroxylated secondary carbon of the 2-hydroxy-1-methylpropyl side chain at C-6 of gulypyrone A was determined as S by applying a modified Mosher’s method. Other well-known metabolites were also isolated including 3-nitropropionic, succinic, and p-hydroxy- and p-methylbenzoic acids, p-hydroxybenzaldehyde, and nectriapyrone. When assayed using a 5 mM concentration on punctured leaf disks of weedy and crop plants, apart from 3-nitropropionic acid (the main metabolite responsible for the strong phytotoxicity of the culture filtrate), phomentrioloxin B caused small, but clear, necrotic spots on a number of plant species, whereas gulypyrone A caused leaf necrosis on Helianthus annuus plantlets. All other compounds were weakly active or inactive. |
Keywords | Ascomycota; Australia; Benzaldehydes; Carthamus; Cyclohexanols; Herbicides; Molecular Structure; Nitro Compounds; Propionates; Pyrones |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 310803. Plant cell and molecular biology |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | University of Naples Federico II, Italy |
Institute of Sciences and Food Production, Italy | |
Charles Sturt University | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q3954/gulypyrones-a-and-b-and-phomentrioloxins-b-and-c-produced-by-diaporthe-gulyae-a-potential-mycoherbicide-for-saffron-thistle-carthamus-lanatus
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