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Exogenous application of salicylic acid induces salinity tolerance in eggplant seedlings

2022; Instituto Internacional de Ecologia (Brazil); Volume: 84; Linguagem: Inglês

10.1590/1519-6984.257739

1678-4375

Valéria Fernandes de Oliveira Sousa, Adriana da Silva Santos, Witalo da Silva Sales, Adjair José da Silva, Fernando Antônio Lima Gomes, Thiago Jardelino Dias, Álvaro Carlos Gonçalves Neto, Ahmad Faraz, João Paulo de Oliveira Santos, Gisele Lopes dos Santos, José Manoel Ferreira de Lima Cruz, Luiz Daniel Rodrigues da Silva, José Rayan Eraldo Souza Araújo,

Seedling growth and survival studies

Under salt stress conditions, plant growth is reduced due to osmotic, nutritional and oxidative imbalance. However, salicylic acid acts in the mitigation of this abiotic stress by promoting an increase in growth, photosynthesis, nitrogen metabolism, synthesis of osmoregulators and antioxidant enzymes. In this context, the objective was to evaluate the effect of salicylic acid doses on the growth and physiological changes of eggplant seedlings under salt stress. The experiment was conducted in a greenhouse, where the treatments were distributed in randomized blocks using a central composite matrix Box with five levels of electrical conductivity of irrigation water (CEw) (0.50; 1.08; 2.50; 3.92 and 4.50 dS m-1), associated with five doses of salicylic acid (SA) (0.00; 0.22; 0.75; 1.28 and 1.50 mM), with four repetitions and each plot composed of three plants. At 40 days after sowing, plant height, stem diameter, number of leaves, leaf area, electrolyte leakage, relative water content, and total dry mass were determined. ECw and SA application influenced the growth and physiological changes of eggplant seedlings. Increasing the ECw reduced growth in the absence of SA. Membrane damage with the use of SA remained stable up to 3.9 dS m-1 of ECw. The relative water content independent of the CEw increased with 1.0 mM of SA. The use of SA at the concentration of 1.0 mM mitigated the deleterious effect of salinity on seedling growth up to 2.50 dS m-1 of ECw.