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Your search keyword '"de Macedo Nava, Francine Falcão"' showing total 5 results
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4. Brown propolis, chitosan and acibenzolar-S-methyl inhibit gray mold and induce postharvest defense responses in strawberries

Author

Stefanski, Francine Spitza, Baseggio, Ediane Roncaglio, Andrade, Julia, Cappellaro, Suelen, de Macedo Nava, Francine Falcão, Mazaro, Sérgio Miguel, and Milanesi, Paola Mendes

Abstract

Botrytis cinereais the etiological agent of gray mold in strawberries, a disease that is difficult to control and requires excessive fungicide application to avoid potential losses, increasing production costs, and allowing pathogen resistance to emerge. In this scenario, activating the plant’s defense mechanisms with abiotic inducers may be a viable and ecological control solution. The objective was to analyze in vitro pathogen conidia growth, sporulation, and germination, as well as in vivo resistance responses by a potential inductor of glyceollin and deoxyanthocyanidin phytoalexins; and to quantify proteins, phenylalanine ammonia-lyase (PAL), total sugars and reducing sugars, and total phenols. The treatments evaluated were brown propolis ethanolic extract (PEE—20, 40, and 60 mL L−1); chitosan (1.0, 3.0, 5.0%) and acibenzolar-S-methyl (ASM—10; 100 and 1000 mg a.i. L−1). At a dose of 20 mL L−1, the propolis ethanolic extract inhibited B. cinerea, while also accumulating glyceollin, deoxyanthocyanidin phytoalexins and subtly eliciting reducing sugars and PAL. Chitosan (1.0 and 3.0%) is also effective at controlling gray mold. At a dose of 100 mg L−1, the standard reference indicator (ASM) was able to reduce the incidence of pathogens in fruits while increasing total sugars and proteins.

Published
2023
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5. Baccharis trimera (Less.) DC responses to water restriction.

Author

de Macedo Nava, Francine Falcão, Conrado da Luz, Vilson, Antonio Stempkowski, Lucas, Fátima Gotz, Lenir, Tonial, Fabiana, and Cargnelutti, Denise

Subjects
*WATER restrictions, *PLANT-water relationships, *ROOT growth, *SUPEROXIDE dismutase, *HYDROGEN peroxide
Abstract

Climate change can cause imbalances in plants. Baccharis trimera is a specie usually found in harsh conditions and has medicinal and agricultural properties. Thus, this study aimed to evaluate the biochemical and physiological responses of this plant under water restriction (WR) levels. B. trimera samples were identified and collected in Erechim/RS and propagated in a greenhouse. When acclimated, they were subjected to 0, 25, 75 and 100% WR, determined according to the water saturation in the soil by capillary action. After 30 days of treatment, the physiological responses: growth, and fresh and dry biomass; and the biochemical responses: activity of superoxide dismutase (SOD), guaiacol peroxidase (GP) and ascorbate peroxidase (APX) enzymes, proline, protein and hydrogen peroxide content, and lipid peroxidation, were determined. Data were submitted to regression analysis and Pearson correlation. The WR of 27.37%, on average, induced an increase in physiological parameters, but the root growth was impaired in conditions above 50% of WR. With the increase in WR there was an increase in the activity of SOD in the shoot and APX in the root. In low WR conditions, proline contents were maintained. Therefore, with low levels of WR, around 27%, B. trimera has increase in root growth and root and shoot biomass. Proline, and SOD and APX activity are a pathway that scavenging the stress generated by WR on B. trimera. [ABSTRACT FROM AUTHOR]

Published
2021
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