Cultivo hidropônico de quiabeiro utilizando soluções nutritivas salinas sob aplicação de ácido salicílico

Pedro Francisco do Nascimento  Sousa; Maíla Vieira Dantas; Geovani Soares de  Lima; Lauriane Almeida dos Anjos  Soares; Hans Raj Gheyi; Luderlândio de Andrade Silva; Kilson Pinheiro  Lopes; Pedro Dantas  Fernandes

doi:10.1590/1983-21252023v36n419rc

Authors

Pedro Francisco do Nascimento Sousa Academic Unit of Agricultural Sciences, Center of Agrifood Science and Technology, Universidade Federal de Campina Grande, Pombal, PB https://orcid.org/0000-0003-3285-4986
Maíla Vieira Dantas Post Graduate Program in Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB https://orcid.org/0000-0001-7751-0533
Geovani Soares de Lima Post Graduate Program in Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB https://orcid.org/0000-0001-9960-1858
Lauriane Almeida dos Anjos Soares Academic Unit of Agricultural Sciences, Center of Agrifood Science and Technology, Universidade Federal de Campina Grande, Pombal, PB https://orcid.org/0000-0002-7689-9628
Hans Raj Gheyi Post Graduate Program in Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB https://orcid.org/0000-0002-1066-0315
Luderlândio de Andrade Silva Academic Unit of Agricultural Sciences, Center of Agrifood Science and Technology, Universidade Federal de Campina Grande, Pombal, PB https://orcid.org/0000-0001-9496-5820
Kilson Pinheiro Lopes Academic Unit of Agricultural Sciences, Center of Agrifood Science and Technology, Universidade Federal de Campina Grande, Pombal, PB https://orcid.org/0000-0003-1577-5901
Pedro Dantas Fernandes Post Graduate Program in Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB https://orcid.org/0000-0001-5070-1030

DOI:

https://doi.org/10.1590/1983-21252023v36n419rc

Keywords:

Abelmoschus esculentus L. Salt stress. Phytohormone. NFT.

Abstract

The limited availability of low-salinity water for irrigation in the Northeastern semi-arid region has restricted food production, making it necessary to use strategies to reduce the effects of salt stress on plants. Among the alternatives, the foliar application of salicylic acid stands out. In this context, the objective of this study was to evaluate the effects of foliar application of salicylic acid in mitigating salt stress on the gas exchange, chlorophyll a fluorescence, photosynthetic pigments, and growth of ‘Canindé’ okra in a hydroponic system. The experiment was carried out in a greenhouse, in Pombal - PB, using the Nutrient Film Technique - NFT hydroponic system. The experimental design used was completely randomized in a split-plot scheme, with four levels of electrical conductivity of the nutrient solution - ECns (2.1, 3.6, 5.1, and 6.6 dS m^-1) as the plots and four concentrations of salicylic acid - SA (0, 1.2, 2.4, and 3.6 mM) as the subplots, with four replicates and two plants per plot. SA concentration of 3.6 mM was able to minimize the effect of nutrient solution salinity on chlorophyll a fluorescence and increase the synthesis of chlorophyll b in okra plants, 34 days after transplanting. Nutrient solution salinity above 2.1 dS m^-1 negatively affected gas exchange, relative water content, photosynthetic pigments, and growth and increased electrolyte leakage in the leaf blade of okra plants.

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