Examinando por Autor "Seimandi, Gisela"

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  • Miniatura
    ÍtemAcceso Abierto
    An update on phytochemicals and pharmacological activities of the genus persicaria and polygonum
    (MDPI, 2021-10-01) Seimandi, Gisela; Álvarez, Norma; Stegmayer, María Inés; Fernández, Laura; Ruiz, Verónica; Favaro, María Alejandra; Derita, Marcos Gabriel
  • Miniatura
    ÍtemAcceso Abierto
    Botanical control of citrus green mold and peach brown rot on fruits assays using a persicaria acuminata phytochemically characterized extract
    (MDPI, 2021-02-24) Di Liberto, Melina G.; Seimandi, Gisela; Fernández, Laura; Ruiz, Verónica; Svetaz, Laura Andrea; Derita, Marcos Gabriel; https://orcid.org/0000-0002-0162-2771; https://orcid.org/0000-0001-8148-936X
    Persicaria acuminata (Polygonaceae) is a perennial herb that grows in the central area of Argentina and it is commonly used by native populations to heal infected wounds and other conditions related to fungal infections. In this article, we explored the in vitro antifungal activity of its ethyl acetate extract against a panel of three fruit phytopathogenic fungi including: Penicillium digitatum, P. italicum, and Monilinia fructicola. The sesquiterpenes isolated from the extract were also evaluated against these strains, demonstrating that the dialdehyde polygodia was the responsible for this activity. In order to encourage the use of the extract rather than the pure compound, we displayed ex vivo assays using fresh oranges and peaches inoculated with P. digitatum and M. fructicola, respectively, and subsequently treated by immersion with an extract solution of 250 and 62.5 µg/mL, respectively. There were no statistically significant differences between the treatments with commercial fungicides and the extract over the control of both fruit rots. The concentration of the active compound present in the extract used on fruit experiments was determined by Gas Chromatography-Mass Spectroscopy. Finally, cytotoxicity evaluation against Huh7 cells showed that P. acuminata extract was less cytotoxic than the commercial fungicides at the assayed concentrations. After these findings we could conclude that a chemically characterized extract of P. acuminata should be further developed to treat fungal diseases in fruits from an agro-ecological model.
  • Miniatura
    ÍtemAcceso Abierto
    Dual benefits of compost tea bacteria: boosting ‘San Andreas’ strawberries’ productivity and fruit quality
    (MDPI, 2026-02-21) Seimandi, Gisela; Garmendia, Gabriela; Nicolier, Juan G.; Favaro, María Alejandra; Ruiz, Verónica; Vero, Silvana; Derita, Marcos Gabriel
    Bacteria represent promising tools for reducing the use of synthetic inputs in crop production. In this study, we evaluated the effects of two bacterial strains isolated from chicken compost tea—Bacillus licheniformis and Pseudomonas mendocina—on the yield and quality of strawberry. Experimental assays were conducted in two seasons (2023 and 2024) under macro-tunnel conditions, with the following treatments: control without applications (Con); commercial NPK fertilizer (FerC); application of B. licheniformis (BL) and P. mendocina (PM) solution in soil once a month. Both bacterial treatments enhanced soil properties. Fruit individual weight significantly increased in BL treatment compared to the control. Similar trends were observed for anthocyanin and ascorbic acid content (increases > 25%), as well as for antioxidant activity (increases of more than 20% and 13% for BL and PM, respectively). The differences were more significant in 2023. In addition, both strains showed positive in vitro results for phytase, siderophore, and IAA production (5.8–8.8 and 9.3–13 µg IAA/mL for BL and PM after 15 days). Although further field validation is required, these results indicate that bacteria (particularly B. licheniformis) show strong potential as bioinoculants to enhance the productivity and quality of strawberry