| Autor: |
Fatima RT; Universidade Federal de Campina Grande - UFCG, Unidade Acadêmica de Engenharia Agrícola - UAEA, Campus Campina Grande, Campina Grande, PB, Brasil., Lima GS; Universidade Federal de Campina Grande - UFCG, Unidade Acadêmica de Engenharia Agrícola - UAEA, Campus Campina Grande, Campina Grande, PB, Brasil., Soares LAA; Universidade Federal de Campina Grande - UFCG, Centro de Ciência e Tecnologia Agroalimentar - CCTA, Campus Pombal, Pombal, PB, Brasil., Veloso LLSA; Universidade Federal de Campina Grande - UFCG, Unidade Acadêmica de Engenharia Agrícola - UAEA, Campus Campina Grande, Campina Grande, PB, Brasil., Silva AARD; Universidade Federal de Campina Grande - UFCG, Unidade Acadêmica de Engenharia Agrícola - UAEA, Campus Campina Grande, Campina Grande, PB, Brasil., Lacerda CN; Universidade Federal de Campina Grande - UFCG, Unidade Acadêmica de Engenharia Agrícola - UAEA, Campus Campina Grande, Campina Grande, PB, Brasil., Silva FA; Universidade Federal de Campina Grande - UFCG, Unidade Acadêmica de Engenharia Agrícola - UAEA, Campus Campina Grande, Campina Grande, PB, Brasil., Nobrega JS; Universidade Federal da Paraíba - UFPB, Centro de Ciências Agrárias - CCA, Campus Areia, Areia, PB, Brasil., Ferreira JTA; Universidade Federal de Campina Grande - UFCG, Unidade Acadêmica de Engenharia Agrícola - UAEA, Campus Campina Grande, Campina Grande, PB, Brasil., Pereira WE; Universidade Federal da Paraíba - UFPB, Centro de Ciências Agrárias - CCA, Campus Areia, Areia, PB, Brasil. |
| Abstrakt: |
The present study aimed to evaluate concentrations and forms of application of salicylic acid used for water stress mitigation on the gas exchange and growth of yellow passion fruit. The experimental design was arranged in randomized blocks in a 4 × 4 × 2 factorial scheme, with four concentrations of salicylic acid (SA) via foliar application (0.0, 0.7, 1.4, and 2.1 mM), four SA concentrations via fertigation (0.0, 0.7, 1.4, and 2.1 mM), and two irrigation depths estimated based on the actual evapotranspiration - ETr (50 and 100% of ETr), with three replications. Water stress negatively affected the physiology and growth of yellow passion fruit seedlings at 75 days after sowing (DAS). The application of salicylic acid, regardless of the form of application, attenuates the effects of water stress on gas exchange and growth of yellow passion fruit, with the best results obtained when applying a concentration of 1.30 mM via leaf or 0.90 mM via fertirrigation. The combination of foliar application of AS and fertigation contributed to improve photosynthetic and growth parameters under water conditions of 50 and 100% of ETr. The foliar application of AS presents superior responses to the application via fertigation. These results reinforce the hypothesis that the attenuation of water stress by salicylic acid is related to the maintenance of gas exchange, which depends on the concentration and form of application, and studies testing combinations throughout the crop cycle become promising for advances in knowledge from the action of this phytohormone on abiotic stress. |
