Trocas gasosas e crescimento de algodoeiro colorido sob estresse salino e aplicação de ácido salicilico

Smyth Trotsk de Araújo  Silva; Lauriane Almeida dos Anjos   Soares; Geovani Soares de  Lima; Saulo Soares da  Silva; Reynaldo Teodoro de  Fátima; Hans Raj  Gheyi; André Alisson Rodrigues da  Silva; Jackson Silva  Nóbrega

doi:10.1590/1983-21252024v3712439rc

Authors

Smyth Trotsk de Araújo Silva Post Graduate Program in Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB, Brazil https://orcid.org/0000-0002-9452-9655
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
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
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
Reynaldo Teodoro de Fátima Post Graduate Program in Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB, Brazil https://orcid.org/0000-0003-0463-4417
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
André Alisson Rodrigues da Silva Post Graduate Program in Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB, Brazil https://orcid.org/0000-0001-9453-1192
Jackson Silva Nóbrega Post Graduate Program in Agricultural Engineering, Universidade Federal de Campina Grande, Campina Grande, PB, Brazil https://orcid.org/0000-0002-9538-163X

DOI:

https://doi.org/10.1590/1983-21252024v3712439rc

Keywords:

Gossypium hirsutum L.. Salinity. Growth regulator.

Abstract

The occurrence of water sources with high salt content stands out as a limiting factor for the expansion of irrigated agriculture in the semi-arid region. In this context, it is essential to look for strategies to mitigate the effects of salt stress, and the application of salicylic acid stands out. The objective of this study was to evaluate gas exchange and growth of the naturally colored cotton cv. BRS Jade under saline water irrigation and foliar application of salicylic acid under semi-arid conditions. The experiment was carried out in containers adapted as drainage lysimeters, under open air conditions at the Center of Science and Agri-Food Technology of the Federal University of Campina Grande in Pombal, Paraíba, Brazil. A randomized block design was adopted, in a 5 × 5 factorial scheme, with treatments resulting from the combination of five levels of electrical conductivity of irrigation water - ECw (0.3, 1.8, 3.3, 4.8, and 6.3 dS m^-1) associated with five concentrations of salicylic acid - SA (0, 1.5, 3.0, 4.5, and 6.0 mM), with three replicates. Water salinity from 0.3 dS m^-1 limited the photosynthetic efficiency and therefore the growth of cotton cv. BRS Jade. Foliar application of SA at concentration of 6.0 mM mitigated the effects of salt stress on the stomatal conductance and leaf transpiration of these plants. However, SA concentrations ranging from 0 to 6.0 mM reduce the internal CO₂ concentration, growth in stem diameter and plant height, and root and stem dry mass accumulation of cotton plants cv. BRS Jade.

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