| Full text | |
| Author(s): |
Gavassi, Marina Alves
[1]
;
Dodd, Ian Charles
[2]
;
Puertolas, Jaime
[2]
;
Silva, Giselle Schwab
[1]
;
Carvalho, Rogerio Falleiros
[3]
;
Habermann, Gustavo
[4]
Total Authors: 6
|
| Affiliation: | [1] Univ Estadual Paulista, Inst Biociencias, Programa Posgrad Biol Vegetal, UNESP, Dept Biodiversidade, Av 24-A 1515, BR-13506900 Rio Claro, SP - Brazil
[2] Univ Lancaster, Lancaster Environm Ctr, Lib Ave, Lancaster LA1 4YQ - England
[3] Univ Estadual Paulista, Fac Ciencias Agr & Vet, Dept Biol Aplicada Agr, UNESP, Via Acesso Prof Paulo Donato Castelane Castellane, BR-14884900 Jaboticabal, SP - Brazil
[4] Univ Estadual Paulista, Inst Biociencias, Dept Biodiversidade, UNESP, Av 24-A 1515, BR-13506900 Rio Claro, SP - Brazil
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | ENVIRONMENTAL AND EXPERIMENTAL BOTANY; v. 179, NOV 2020. |
| Web of Science Citations: | 3 |
| Abstract | |
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 (g(s)) are unclear, mainly in well-watered conditions. We exposed tomato plants (Solarium lycopersicum) to 0, 25, 50 and 100 mu M Al in nutrient solution to investigate whether Al impairs root hydraulic conductance (Lp(r)), affecting leaf water potential (Psi(leaf)) 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 g(s) in plants exposed to Al. Declines in Lp(r). and g(s) were proportional to the increase in Al concentration, and all Al treatments similarly decreased Psi(leaf), 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 mu M Al), the leaf hydration and stomatal opening was not conserved. Here we provide the first evidence that decreases in Lp(r). and increases in ABA might explain Al-induced stomatal closure. (AU) | |
| FAPESP's process: | 15/25409-4 - Role of ABA in water relations in metabolisms with contrasting sensitivities to Al3+ |
| Grantee: | Marina Alves Gavassi |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 18/08902-7 - ABA signaling for stomatal closure under Al stress |
| Grantee: | Marina Alves Gavassi |
| Support Opportunities: | Scholarships abroad - Research Internship - Doctorate |