Navegando por Autor "Paula, Gabriel Ferreira de"

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    Rizobactérias e proteção de plantas ao estresse hídrico
    (Universidade Estadual do Norte do Paraná, 2021-02-26) Paula, Gabriel Ferreira de; Matsumoto, Leopoldo Sussumu; https://orcid.org/0000-0001-5102-545X; http://lattes.cnpq.br/0857955043436449; Matsumoto, Leopoldo Sussumu; https://orcid.org/0000-0001-5102-545X; http://lattes.cnpq.br/0857955043436449; Oliveira, André Luiz Martinez de; https://orcid.org/0000-0002-0841-4844; http://lattes.cnpq.br/1885766127325722; Seiva, Fábio Rodrigues Ferreira; https://orcid.org/0000-0002-7461-8773; http://lattes.cnpq.br/2646377436835972; Silva, Adriana Pereira da; http://lattes.cnpq.br/6044648047285095; Kolln, Oriel Tiago; https://orcid.org/0000-0002-8507-9808; http://lattes.cnpq.br/8041626078120100
    Different extreme climatic conditions lead to the accumulation of reactive oxygen species (ROS) in plants, such as drought, inducing oxidative stress, which can cause serious damage to organelles, as well as plant death. Plant growth-promoting rhizobacteria (PGPR) are microorganisms that act in the plant's rhizosphere, providing support for its development in a direct and indirect way, in addition to inducing physiological responses, such as the activation of the plant antioxidant defense system. Thus, the objective of the work was to evaluate 4 strains of PGPR in view of their ability to mitigate the oxidative stress generated by drought in soybean plants. The activities of superoxide dismutase (SOD), catalase (CAT), guaiacol peroxidase (GPX), malondialdehyde (MDA), chlorophyll A and B, and leaf water content of plants under normal water condition, moderate drought stress, severe drought stress, and post-stress rehydration, grown under greenhouse conditions, were quantified. The results indicate that plants inoculated with PGPR showed an increase in the activity of antioxidant enzymes, levels of chlorophyll A and B, and leaf water content, in addition to a reduction in MDA levels compared to the control, indicating less lipid peroxidation. In this sense, it can be concluded that the use of the PGPR isolates analyzed in this work can be a sustainable alternative to alleviate the oxidative stress induced by water deficit.