Hydrogen peroxide application methods in guava seedlings grown under salt stress
DOI:
https://doi.org/10.5433/1679-0359.2025v46n4p1191Keywords:
Antioxidant enzymes, Elicitors, Psidium guajava L, Saline water.Abstract
The guava plant is of great socioeconomic importance in Northeastern Brazil. However, in this region, irrigation water often contains high salt concentrations that compromise plant growth. Therefore, strategies to mitigate the deleterious effects of salt stress on plants are necessary, such as the exogenous application of hydrogen peroxide. Nonetheless, studies on its application are still scarce. This study aimed to evaluate different methods of hydrogen peroxide application in guava plants irrigated with saline water during the seedling formation phase. The experiment was conducted under greenhouse conditions at the CCTA/UFCG in Pombal - PB, Brazil. It followed a randomized complete block design in a 5 × 4 factorial arrangement consisting of five levels of irrigation water electrical conductivity (ECw) (0.3, 1.1, 1.9, 2.7, and 3.5 dS m-1) and four hydrogen peroxide (H2O2) application methods (M1 – no peroxide application, M2 – seed soaking, M3 – foliar spray, and M4 – seed soaking + foliar spray), all at a concentration of 20 μM, with three replicates and two plants per plot. Water salinity above 0.3 dS m-1 inhibited growth, total chlorophyll content, and dry matter accumulation in guava cv. Paluma seedlings. Foliar spray application of H2O2 mitigated the effects of salt stress on the number of leaves, leaf area, and dry matter in guava plants. H2O2 at a concentration of 20 μM reduced electrolyte leakage regardless of the application method. Guava seedlings irrigated with water up to 3.5 dS m-1 showed acceptable quality for field transplantation.
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Copyright (c) 2025 Valéria Fernandes de Oliveira Sousa, Lauriane Almeida dos Anjos Soares, Anderson de Araújo Mendes, Geovani Soares de Lima, Reynaldo Teodoro de Fátima , Maria Amanda Guedes, Hans Raj Gheyi, Reginaldo Gomes Nobre, Kilson Pinheiro Lopes, Iara Almeida Roque
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