Peróxido de hidrogênio na aclimatação de genótipos de algodão colorido ao estresse salino

Luana Lucas de Sá Almeida Veloso; Carlos Alberto Vieira de  Azevedo; Reginaldo Gomes Nobre; Geovani Soares de Lima; Idelvan José da Silva; Cassiano Nogueira de Lacerda

doi:10.1590/1983-21252023v36n218rc

Authors

Luana Lucas de Sá Almeida Veloso Post Graduate Program in Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB https://orcid.org/0000-0003-0537-7985
Carlos Alberto Vieira de Azevedo Post Graduate Program in Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB https://orcid.org/0000-0001-7336-1243
Reginaldo Gomes Nobre Department of Science and Technology, Universidade Federal Rural do Semi-Árido, Caraúbas, RN https://orcid.org/0000-0002-6429-1527
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
Idelvan José da Silva Post Graduate Program in Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB https://orcid.org/0000-0001-9559-8663
Cassiano Nogueira de Lacerda Post Graduate Program in Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB https://orcid.org/0000-0002-4132-1287

DOI:

https://doi.org/10.1590/1983-21252023v36n218rc

Keywords:

Gossypium hirsutum L. Salinity. H2O2.

Abstract

The excess of salts in irrigation water restricts agricultural exploitation in arid and semi-arid regions. Thus, searching for strategies of cultivation under salt stress conditions is important for the expansion of irrigated agriculture in these regions. Thus, the objective of this study was to evaluate the gas exchange and growth rates of naturally colored-fiber cotton genotypes irrigated with saline water and under exogenous foliar application of hydrogen peroxide concentrations. The experiment was carried out under greenhouse conditions, in Campina Grande - PB, using the randomized block experimental design and 4 × 3 × 2 factorial arrangement, with four concentrations of hydrogen peroxide - H₂O₂ (0, 25, 50, and 75 µM), three colored-fiber cotton genotypes - CG (BRS Rubi; BRS Topázio; BRS Verde) and two levels of electrical conductivity of water - ECw (0.8 and 5.3 dS m^-1), with three replicates. Irrigation using water with electrical conductivity of 5.3 dS m^-1 associated with foliar application of 50 µM of hydrogen peroxide favors gas exchange and growth rates of BRS Rubi cotton, at 60 days after sowing. Salinity of 5.3 dS m^-1 associated with foliar applications of 50 µM of hydrogen peroxide increased the percentage of cell damage and the internal CO₂ concentration, but reduced the stomatal conductance, transpiration, CO₂ assimilation rate, and growth rates of BRS Topázio cotton.

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