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. 2020 Oct;32(10):1234-1242.
doi: 10.1002/chir.23270. Epub 2020 Jul 20.

Further secondary metabolites produced by the fungus Pyricularia grisea isolated from buffelgrass (Cenchrus ciliaris)

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Further secondary metabolites produced by the fungus Pyricularia grisea isolated from buffelgrass (Cenchrus ciliaris)

Marco Masi et al. Chirality. 2020 Oct.

Abstract

The fungal pathogen Pyricularia grisea has been studied to evaluate its production of phytotoxins for the biocontrol of the buffelgrass (Cenchrus ciliaris L.) weed. A first investigation allowed to isolate several new and known phytotoxic metabolites. However, the further investigation on the organic extract obtained from the fungus liquid culture showed the presence of other metabolites possibly contributing to its phytotoxicity. Thus, four known metabolites were isolated and identified by spectroscopic (nuclear magnetic resonance [NMR] and high-resolution electrospray ionization mass spectrometry [HRESIMS]) methods as dihydropyriculol (1), epi-dihydropyriculol (2), 3-methoxy-6,8-dihydroxy-3-methyl-3,4-dihydroisocoumarin (3), and (R)-mevalonolactone (4). The absolute configuration of 1-3 was determined for the first time by a computational analysis of their electronic circular dichroism (ECD) spectra. When the isolated compounds were bioassayed at a concentration of 5 × 10-3 M in a buffelgrass coleoptile and radicle elongation test no toxicity was detected. On the contrary, compounds 1 and 3 showed a significant stimulating effect of radical elongation. Furthermore, the difference in growth stimulation between 1 and its epimer 2 highlights the tight relationship between absolute configuration and biological activity of these fungal metabolites.

Keywords: TDDFT computations; absolute configuration; biopesticides; electronic circular dichroism; growth stimulating effect.

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References

REFERENCES

    1. Abella SR, Chiquoine LP, Backer DM. Ecological characteristics of sites invaded by buffelgrass (Pennisetum ciliare). Invasive Plant Sci Manag. 2012;5(4):443-453.
    1. Franklin KA, Molina-Freaner F. Consequences of buffelgrass pasture development for primary productivity, perennial plant richness, and vegetation structure in the drylands of Sonora, Mexico. Conserv Biol. 2010;24(6):1664-1673.
    1. Marshall VM, Lewis MM, Ostendorf B. Buffelgrass (Cenchrus ciliaris) as an invader and threat to biodiversity in arid environments: a review. J Arid Environ. 2012;78:1-12.
    1. Olsson AD, Betancourt JL, Crimmins MA, Marsh SE. Constancy of local spread rates for buffelgrass (Pennisetum ciliare L.) in the Arizona Upland of the Sonoran Desert. J Arid Environ. 2012;87:136-143.
    1. Tinoco-Ojanguren C, Reyes-Ortega I, Sánchez-Coronado ME, Molina-Freaner F, Orozco-Segovia A. Germination of an invasive Cenchrus ciliaris L. (buffelgrass) population of the Sonoran Desert under various environmental conditions. S Afr J Bot. 2016;104:112-117.

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