Trocas gasosas, eficiência fotoquímica e crescimento de quiabeiro hidropônico sob estresse salino e ácido salicílico

Allysson Jonhnny Torres Mendonça; Geovani Soares de Lima; Lauriane Almeida dos Anjos Soares; Valeska Karoline Nunes Oliveira de Sá; Saulo Soares da Silva; Rafaela Aparecida Frazão Torres; Jean Télvio Andrade Ferreira; Hans Raj  Gheyi

doi:10.1590/1983-21252024v3712143rc

Authors

Allysson Jonhnny Torres Mendonça Post Graduate Program in Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB, Brazil https://orcid.org/0000-0002-0446-6970
Geovani Soares de Lima Post Graduate Program in Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB, Brazil https://orcid.org/0000-0001-9960-1858
Lauriane Almeida dos Anjos Soares Academic Unit of Agricultural Sciences, Universidade Federal de Campina Grande, Pombal, PB, Brazil https://orcid.org/0000-0002-7689-9628
Valeska Karoline Nunes Oliveira de Sá Post Graduate Program in Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB, Brazil https://orcid.org/0000-0003-1497-6883
Saulo Soares da Silva Post Graduate Program in Agroindustrial Systems, Universidade Federal de Campina Grande, Pombal, PB, Brazil https://orcid.org/0000-0002-1049-6519
Rafaela Aparecida Frazão Torres Post Graduate Program in Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB, Brazil https://orcid.org/0000-0001-5266-5811
Jean Télvio Andrade Ferreira Post Graduate Program in Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB, Brazil https://orcid.org/0000-0002-4629-9429
Hans Raj Gheyi Post Graduate Program in Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB, Brazil https://orcid.org/0000-0002-1066-0315

DOI:

https://doi.org/10.1590/1983-21252024v3712143rc

Keywords:

Abelmoschus esculentus L. Moench. Salinity. Soilless cultivation.Osmoregulation.

Abstract

Okra (Abelmoschus esculentus L.) is a shrub belonging to the Malvaceae family, which stands out for its rusticity and adaptation to soil and climatic conditions, being cultivated by small farmers, especially in the semi-arid region of Northeast Brazil. In this context, the objective of this study was to evaluate the effect of foliar application of salicylic acid as an attenuator of salt stress on leaf gas exchange, photochemical efficiency, and growth of okra cv. Canindé in a hydroponic system. The experiment was carried out using a Nutrient Film Technique - NFT hydroponic system in a greenhouse, in Pombal, PB, Brazil, from January to March 2022, in a completely randomized design, in a split-plot scheme, with the four levels of electrical conductivity of the nutrient solution - ECns (3.0, 5.0, 7.0, and 9.0 dS m^-1) considered as plots and four concentrations of salicylic acid – SA (0, 1.2, 2.4, and 3.6 mM) considered as subplots, with three replicates and two plants per plot. Increase in ECns levels from 3.0 dS m^-1 inhibited leaf gas exchange, photochemical efficiency, and growth of okra cv. Canindé in hydroponic cultivation, at 34 days after transplanting. Foliar application of SA at concentrations of 2.2 and 1.5 mM promoted increments in stomatal conductance and transpiration, respectively. Salicylic acid at concentration of 1.9 mM associated with saline nutrient solution of 9.0 dS m^-1 increased the variable fluorescence of okra plants cv. Canindé, at 34 days after transplantation.

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