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Photoinactivation of Colletotrichum truncatum, Corynespora cassiicola, Sclerotinia sclerotiorum and Rhizoctonia solani in soybean seeds by cationic porphyrins

PUBLISHED June 24, 2023 (DOI: https://doi.org/10.54985/peeref.2306p7813370)



Carolina C. Saulle1 , Alexandre Claus1 , Letícia De A. Sales1 , Alan G. Gonçalves1 , Diogo R. B. Ducatti1 , Miguel D. Noseda1 , Louise L. May De Mio1
  1. Federal University of Paraná

Conference / event

52º Brazilian Congress of Phytopathology, August 2021 (Virtual)

Poster summary

The aim of the present study was to evaluate the efficiency of PDI in the photoinactivation of C. truncatum, C. cassiicola, S. sclerotiorum and R. solani, using a mixture of cationic meso-tetra-aryl porphyrins as PS, being the first study to consider this formulation as PS in the photoinactivation of these pathogens. Assays were carried out with soybean seeds artificially inoculated with the different fungi, treated with the PS at 10, 50, 100 and 200 μg/ml and submitted to light under an irradiance of 50 mW/cm2. The assays were set up following the blotter test methodology. The evaluations showed significant reductions in the infection rates of the seeds in relation to the controls. The greatest reductions were 46% for C. truncatum, 95.5% for S. sclerotiorum, 87% for C. cassiicola and 92% for R. solani. The results suggest that PDI can be an important alternative to current control methods against these pathogens.


Alternative control, Glycine max, Photodynamic inactivation, Seeds

Research areas

Agriculture, Biological Sciences, Plant Sciences, Chemistry


  1. Adler, A. D., et al. A simplified synthesis for meso-tetraphenylporphine. The Journal of Organic Chemistry, v. 32, n. 2, p. 476-476, 1967.
  2. Companhia Nacional de Abastecimento- CONAB. 8º levantamento da safra 2020/2021 de grãos [8th survey of the 2020/2021 grain harvest]. Brazil, 2021.
  3. Goulart, A. C. P. Fungi in soybean seeds: detection, important and control. 2. ed. rev., EMBRAPA, 2018.


  1. Higher Education Personnel (CAPES)/Brazil (No. 001)
  2. National Council for Scientific and Technological Development (CNPq)/Brazil

Supplemental files

No data provided

Additional information

Competing interests
No competing interests were disclosed.
Data availability statement
The datasets generated during and / or analyzed during the current study are available from the corresponding author on reasonable request.
Creative Commons license
Copyright © 2023 C. Saulle et al. This is an open access work distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
C. Saulle, C., Claus, A., De A. Sales, L., G. Gonçalves, A., R. B. Ducatti, D., D. Noseda, M., L. May De Mio, L. Photoinactivation of Colletotrichum truncatum, Corynespora cassiicola, Sclerotinia sclerotiorum and Rhizoctonia solani in soybean seeds by cationic porphyrins [not peer reviewed]. Peeref 2023 (poster).
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