Mineral composition and physiology of soursop under salt stress and application of hydrogen peroxide

• Autor(a) principal: Capitulino, Jessica Dayanne
• Data de Publicação: 2024
• Outros Autores: Lima, Geovani Soares de, Azevedo, Carlos Alberto Vieira de, Silva, André Alisson Rodrigues da, Arruda, Thiago Filipe de Lima, Soares, Lauriane Almeida dos Anjos, Fátima, Reynaldo Teodoro de, Paiva, Francisco Jean da Silva, Gheyi, Hans Raj, Souza, Allesson Ramos de
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Semina. Ciências Agrárias (Online)
• Texto Completo: https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/50024
• topic: Annona muricata L; Nutrição vegetal; Estresse salino.; Annona muricata L; Nutritional analysis. Forestry. Mineral nutrition. plant nutrition. Fertilization.; Salt stress.

The soursop plant adapts well to the edaphoclimatic conditions of the semi-arid region of northeastern Brazil. However, the presence of waters with high salt concentrations stands out as limiting factor for the expansion of the cultivation of this fruit crop. Therefore, identifying strategies to enable fruit production is crucial. This study aimed to assess the mineral composition in leaf tissues and the physiology of soursop cv. Morada Nova plants under saline water irrigation and foliar application of hydrogen peroxide during the pre-flowering phase. The research was conducted in a greenhouse in Campina Grande, PB, Brazil, employing a randomized block design in a 4 × 4 factorial arrangement. This arrangement included four levels of irrigation water electrical conductivity (ECw: 0.8, 1.6, 2.4, and 3.2 dS m-1) and four hydrogen peroxide (H2O2) concentrations (0, 10, 20, and 30 μM), with three replications, totaling 48 experimental plots with one plant each. Saline water irrigation adversely influenced the biosynthesis of chlorophyll a and b, initial and variable fluorescence, and the quantum efficiency of photosystem II in soursop, 370 days post-transplanting. Hydrogen peroxide concentration of 30 μM exacerbated the effect of salt stress on the leaf nitrogen, phosphorus, and potassium contents. However, concentrations of 15, 12, and 9 μM, respectively, enhanced the N, P, and K levels in the leaf tissues of soursop cv. Morada Nova, 780 days post-transplanting. Nutrient accumulation in the leaves of soursop cv. Morada Nova during the pre-flowering phase occurs in the following descending order: P>N>K>S>Cl>Na.