Baccharis trimera (Less.) DC responses to water restriction

Keywords: Drought, medicinal plant, oxidative stress, biochemistry, proline


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.


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Author Biographies

Francine Falcão de Macedo Nava, University of Passo Fundo, Passo Fundo, Rio Grande do Sul

Graduada em Agronomia pela Universidade Federal da Fronteira Sul, Mestra em Agronomia pela Universidade de Passo Fundo, Doutoranda em Agronomia pela Universidade de Passo Fundo. 

Vilson Conrado da Luz, Universidade de São Paulo, São Paulo

Engenheiro Ambiental e Sanitarista, Mestrando em Engenharia Química, Universidade de São Paulo, São Paulo.

Lucas Antonio Stempkowski, Federal University of Viçosa, Viçosa, Minas Gerais

Engenheiro Agrônomo, Doutorando em Fitopatologia, Universidade Federal de Viçosa, Viçosa.

Lenir Fátima Gotz, University of São Paulo, Piracicaba, São Paulo

Engenheira Agrônoma, Doutoranda em Solos e Nutrição de Plantas, Universidade de São Paulo, Piracicaba.

Fabiana Tonial, University of Passo Fundo, Passo Fundo, Rio Grande do Sul

Farmacêutica-Bioquímica, Doutora em Microbiologia, Parasitologia e Patologia, Professora, Universidade de Passo Fundo, Passo Fundo

Denise Cargnelutti, Federal University of Fronteira Sul, Erechim, Rio Grande do Sul

Bióloga, Doutora em Bioquímica Toxicológica, Professora, Universidade Federal da Fronteira Sul, Erechim.


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How to Cite
NAVA, F. F. DE M.; LUZ, V. C. DA; STEMPKOWSKI, L. A.; GOTZ, L. F.; TONIAL, F.; CARGNELUTTI, D. Baccharis trimera (Less.) DC responses to water restriction. Revista Verde de Agroecologia e Desenvolvimento Sustentável, v. 16, n. 3, p. 229 - 237, 1 Jul. 2021.