Photosynthetica 2025, 63(2):116-128 | DOI: 10.32615/ps.2025.017

Effect of strobilurin fungicide on the initial growth of common bean plants

A.C.P. ROCHA1, J.F. MIRANDA1, L.B. DAS NEVES2, M.M. MENDES1, A.S. AMORIM1, G.S. MORAIS2, J.P.R. MARTINS3, M.B. DA SILVA2, A.B.P.L. GONTIJO2, A.R. FALQUETO2
1 Center for Human and Natural Sciences, Federal University of Espírito Santo, Avenida Fernando Ferrari 514, 29075-910 Vitória, ES, Brazil
2 Department of Agrarian and Biological Sciences, Federal University of Espírito Santo, Litorâneo, 29932-540 São Mateus, ES, Brazil
3 Institute of Dendrology, Polish Academy of Sciences, Parkowa 5, 62-035 Kórnik, Poland

Strobilurin fungicides, such as pyraclostrobin (PCL), can impact plant metabolism and morphophysiological parameters. This study evaluated the effects of PCL on Phaseolus vulgaris L., subjecting seeds to imbibition in different concentrations (0, 112, 450; and 1,800 mg L-1) for 10 and 30 min. After germination in a growth chamber, germination, growth, biomass, anatomical, and physiological characteristics were analyzed. The study confirmed that PCL interference was proportional to the concentration and seed imbibition time, affecting the percentage of germinated seeds in the first count, normal and abnormal seedlings, and dead seeds. There was a reduction in seedling growth and metaxylem diameter, resulting in lower biomass accumulation. However, lower concentrations (0 and 112 mg L-1) favored the effective photochemical activity of PSII. We concluded that PCL influences seedling germination, anatomy, and physiology, with reduced concentrations potentially beneficial.

Additional key words: chlorophyll a fluorescence; Phaseolus vulgaris; plant anatomy; pyraclostrobin.

Received: February 27, 2025; Revised: April 29, 2025; Accepted: May 7, 2025; Prepublished online: June 2, 2025; Published: July 10, 2025  Show citation

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ROCHA, A.C.P., MIRANDA, J.F., DAS NEVES, L.B., MENDES, M.M., AMORIM, A.S., MORAIS, G.S., ... FALQUETO, A.R. (2025). Effect of strobilurin fungicide on the initial growth of common bean plants. Photosynthetica, 63(2), 116-128. doi: 10.32615/ps.2025.017
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