NDLI: In vitro photodynamic inactivation of conidia of the phytopathogenic fungus Colletotrichum graminicola with cationic porphyrins

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Photochemical & Photobiological Sciences Vol -9

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In vitro photodynamic inactivation of conidia of the phytopathogenic fungus Colletotrichum graminicola with cationic porphyrins

Content Provider	Royal Society of Chemistry (RSC)
Author	Barreira, Sandra Mara Woranovicz Murakami, Fabio Seigi Noseda, Miguel Daniel Vandresen, Camila Chevonica Duarte, Maria Eugenia Rabello Ducatti, Diogo Ricardo Bazan Gonçalves, Alan Guilherme
Copyright Year	2016
Abstract	Photodynamic inactivation (PDI) is an efficient approach for the elimination of a series of microorganisms; however, PDI involving phytopathogenic filamentous fungi is scarce in the literature. In the present study, we have demonstrated the photoinactivating properties of five cationic meso-(1-methyl-4-pyridinio)porphyrins on conidia of the phytopathogen Colletotrichum graminicola. For this purpose, photophysical properties (photostability and 1O2 singlet production) of the porphyrins under study were first evaluated. PDI assays were then performed with a fluence of 30, 60, 90 and 120 J cm−2 and varying the porphyrin concentration from 1 to 25 μmol L−1. Considering the lowest concentration that enabled the best photoinactivation, with the respective lowest effective irradiation time, the meso-(1-methyl-4-pyridinio)porphyrins herein studied could be ranked as follows: triple-charged 4 (1 μmol L−1 with a fluence of 30 J cm−2) > double-charged-trans2 (1 μmol L−1 with 60 J cm−2) > tetra-charged 5 (15 μmol L−1 with 90 J cm−2) > mono-charged 1 (25 μmol L−1 with 120 J cm−2). Double-charged-cis-porphyrin 3 inactivated C. graminicola conidia in the absence of light. Evaluation of the porphyrin binding to the conidia and fluorescence microscopic analysis were also performed, which were in agreement with the PDI results. In conclusion, the cationic porphyrins herein studied were considered efficient photosensitizers to inactivate C. graminicola conidia. The amount and position of positive charges are related to the compounds’ amphiphilicity and therefore to their photodynamic activity.
Starting Page	673
Ending Page	681
Page Count	9
File Format	HTM / HTML PDF
ISSN	1474905X
Volume Number	15
Issue Number	5
Journal	Photochemical & Photobiological Sciences
DOI	10.1039/c5pp00372e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Fungus Plant pathology PDI Porphyrin Fluorescence Conidium Colletotrichum
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry

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