Natural Products Obtained from Argentinean Native Plants Are Fungicidal against Citrus Postharvest Diseases

Author:

Alvarez Norma Hortensia12,Stegmayer María Inés1,Seimandi Gisela Marisol1ORCID,Pensiero José Francisco12,Zabala Juan Marcelo12,Favaro María Alejandra12,Derita Marcos Gabriel13ORCID

Affiliation:

1. ICiAgro LitoraL, Universidad Nacional del Litoral, CONICET, Kreder 2805, Esperanza, Santa Fe 3080HOF, Argentina

2. Facultad de Ciencias Agrarias, Universidad Nacional del Litoral, Kreder 2805, Esperanza, Santa Fe 3080HOF, Argentina

3. Cátedra de Farmacognosia, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 531, Rosario, Santa Fe S2002LRK, Argentina

Abstract

Natural products obtained from plants constitute an alternative to chemically synthesized fungicides, whose improper use might have caused the development of resistant fungal strains. In the present work, 40 products obtained from 20 native Argentinean plant species were tested against three citrus postharvest pathogens: Penicillium digitatum, Penicillium italicum, and Geotrichum citri-aurantii. Natural products were obtained by classical solvent extraction methods and the fungicidal evaluation was carried out by agar diffusion tests using commercial fungicides as negative controls and dimethyl sulfoxide as a positive one. The inhibition percentages were determined 7 and 14 days post inoculation of each fungus. Most of the products tested showed inhibition percentages higher than 50% for G. citri-aurantii, but only 20% of them were active against P. digitatum and P. italicum. The most promising products which inhibited (100%) the growth of at least one of the three phytopathogens were extracted from the following plants: Orthosia virgata, Petiveria alliacea, Funastrum clausum, Solanum caavurana, and Solanum pilcomayense. These products were tested over inoculated oranges and there were no statistically significant differences between the treatments with a commercial fungicide and the methanolic extract in the control of fruit rot. The products extracted from native plants have fungicide potential, but further studies are required.

Funder

ANPCyT

CONICET

Publisher

MDPI AG

Subject

Horticulture,Plant Science

Reference44 articles.

1. Bautista-Baños, S. (2014). Postharvest Decay, Control Strategies, Academic Press.

2. (2023, March 12). La Actividad Citrícola. Available online: https://www.federcitrus.org/wp-content/uploads/2022/07/La-Actividad-Citricola-2022.pdf.

3. Reuter, W., Calavan, E.C., and Carman, G.E. (1989). The Citrus Industry: Division of Agriculture and Natural Resources, California Press.

4. Ogawa, J.M., Zehr, E., Bird, G.W., Ritchie, D.F., Uriu, K., and Uyemoto, J.K. (1995). Compendium of Stone Fruit Diseases, American Phytopathological Society.

5. Control of citrus postharvest green mold and sour rot by potassium sorbate combined with heat and fungicides;Smilanick;Postharvest Biol. Technol.,2008

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