Autor(es):
Gavassi, Marina Alves [UNESP] ; Dodd, Ian Charles ; Puértolas, Jaime ; Silva, Giselle Schwab [UNESP] ; Carvalho, Rogério Falleiros [UNESP] ; Habermann, Gustavo [UNESP]
Data: 2020
Identificador Persistente: http://hdl.handle.net/11449/200907
Origem: Oasisbr
Assunto(s): Abscisic acid; Aluminum; Stomatal conductance; Water transport; Xylem sap pH; Abscisic acid; Abscisic acid; Aluminum; Aluminum; Stomatal conductance; Stomatal conductance; Water transport; Water transport; Xylem sap pH; Xylem sap pH
Descrição
Made available in DSpace on 2020-12-12T02:19:13Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-11-01
Many studies ask how aluminum (Al) reduces the root growth, but as Al is mostly retained in the root system, physiological explanations for the also expected Al-induced decrease in stomatal conductance (gs) are unclear, mainly in well-watered conditions. We exposed tomato plants (Solanum lycopersicum) to 0, 25, 50 and 100 μM Al in nutrient solution to investigate whether Al impairs root hydraulic conductance (Lpr), affecting leaf water potential (Ψleaf) and possibly inducing abscisic acid (ABA) accumulation in roots and/or leaves. We also measured ABA delivery rate, xylem sap pH and the root/leaf area ratio in order to explain the low gs in plants exposed to Al. Declines in Lpr and gs were proportional to the increase in Al concentration, and all Al treatments similarly decreased Ψleaf, indicating the plant's attempt to reduce water loss through transpiration while accumulating more ABA. Despite Al-induced increases in root ABA, the root-to-shoot delivery of ABA did not enhance, but Al caused root xylem sap alkalization. Despite the stability of root/leaf area ratio across a range of Al concentrations (0, 25 and 50 μM Al), the leaf hydration and stomatal opening was not conserved. Here we provide the first evidence that decreases in Lpr and increases in ABA might explain Al-induced stomatal closure.
Programa de Pós-Graduação em Biologia Vegetal Departamento de Biodiversidade Instituto de Biociências Universidade Estadual Paulista UNESP, Av. 24-A
Lancaster Environment Centre Lancaster University Lancaster University, Library Avenue, Lancaster
Departamento de Biologia Aplicada à Agropecuária Faculdade de Ciências Agrárias e Veterinárias Universidade Estadual Paulista UNESP, Via de Acesso Professor Paulo Donato Castelane Castellane S/N - Vila Industrial
Departamento de Biodiversidade Instituto de Biociências Universidade Estadual Paulista UNESP, Av. 24-A, 1515
Programa de Pós-Graduação em Biologia Vegetal Departamento de Biodiversidade Instituto de Biociências Universidade Estadual Paulista UNESP, Av. 24-A
Departamento de Biologia Aplicada à Agropecuária Faculdade de Ciências Agrárias e Veterinárias Universidade Estadual Paulista UNESP, Via de Acesso Professor Paulo Donato Castelane Castellane S/N - Vila Industrial
Departamento de Biodiversidade Instituto de Biociências Universidade Estadual Paulista UNESP, Av. 24-A, 1515
