Issue 7, 2004
From the journal:

Photochemical & Photobiological Sciences

Light- and singlet oxygen-mediated antifungal activity of phenylphenalenonephytoalexins

Alejandra Lazzaro,b   Montserrat Corominas,a   Cristina Martí,a   Cristina Flors,a   Laura R. Izquierdo,b   Teresa A. Grillo,b   Javier G. Luisb  and  Santi Nonell*a  

* Corresponding authors

a Grup d'Enginyeria Molecular, Institut Químic de Sarrià, Universitat Ramon Llull, Via Augusta 390, 08017-Barcelona, Spain
E-mail: s.nonell@iqs.es
Fax: +34 93 205 6266
Tel: +34 93 267 2000

b Instituto Universitario de Bio-Orgánica “Antonio González”, Universidad de La Laguna, Avda. Astrofísico Sánchez 2, 38206-La Laguna, Tenerife, Canary Islands, Spain

Abstract

The light-induced singlet oxygen production and antifungal activity of phenylphenalenone phytoalexins isolated from infected banana plants (Musa acuminata) are reported. Upon absorption of light energy all studied phenylphenalenones sensitise the production of singlet oxygen in polar and non-polar media. Antifungal activity of these compounds towards Fusarium oxysporum is enhanced in the presence of light. These results, together with the correlation of IC50 values under illumination with the quantum yield of singlet oxygen production and the enhancing effect of D2O on the antifungal activity, suggest the intermediacy of singlet oxygen produced by electronic excitation of the phenylphenalenone phytoalexins.

Graphical abstract: Light- and singlet oxygen-mediated antifungal activity of phenylphenalenone phytoalexins

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Article information

DOI
https://doi.org/10.1039/B401294A
Article type
Paper
Submitted
27 Jan 2004
Accepted
19 Apr 2004
First published
05 May 2004

Photochem. Photobiol. Sci., 2004,3, 706-710

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Light- and singlet oxygen-mediated antifungal activity of phenylphenalenone phytoalexins

A. Lazzaro, M. Corominas, C. Martí, C. Flors, L. R. Izquierdo, T. A. Grillo, J. G. Luis and S. Nonell, Photochem. Photobiol. Sci., 2004, 3, 706 DOI: 10.1039/B401294A

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