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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Aluminum-induced decrease in CO2 assimilation in `Rangpur' lime is associated with low stomatal conductance rather than low photochemical performances

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Autor(es):
Banhos, Otavia F. A. A. [1] ; Carvalho, Brenda M. de O. [2] ; da Veiga, Eduardo B. [1] ; Bressan, Anna C. G. [1] ; Tanaka, Francisco A. O. [3] ; Habermann, Gustavo [4]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Univ Estadual Paulista, Programa Posgrad Ciencias Biol Biol Vegetal, Inst Biociencias, Dept Bot, Av 24-A, 1515, BR-13506900 Rio Claro, SP - Brazil
[2] Univ Fed Sao Carlos, Ctr Ciencias Agr, Rodovia Anhanguera, Km 174, Araras, SP - Brazil
[3] Univ Sao Paulo, Nucleo Apoio Pesquisa Microscopia Eletron Aplicad, Escola Super Agr Luiz de Queiroz, ESALQ USP, Dept Fitopatol & Nematol, Av Padua Dias 11, BR-13418900 Piracicaba, SP - Brazil
[4] Univ Estadual Paulista, Inst Biociencias, Dept Bot, Av 24-A, 1515, BR-13506900 Rio Claro, SP - Brazil
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: Scientia Horticulturae; v. 205, p. 133-140, JUN 23 2016.
Citações Web of Science: 8
Resumo

Aluminum (Al) is toxic to most plants. Although inhibition of root elongation can occur even under 10 mu M Al, above 1000 mu M damage to photochemical performances has been reported, reducing the CO2 assimilation rate (A). However, Al is retained in the roots of most plants, including Citrus limonia ('Rangpur' lime) with no direct explanation for the low A. In this study, `Rangpur' lime plants were cultivated hydroponically in a nutrient solution with 1480 mu M Al, and we expected to determine the time range within which Al-induced decrease in A starts. To our surprise, low stomata( conductance (gs) rather than low photochemical performances was evident 45 days after exposing the roots to Al. Aluminum was mostly retained in the roots and histochemically observed in the stele, suggesting reduction in water uptake/transport in the xylem that became fibrous. We also found a 35% reduction in the midday leaf water potential in plants exposed to Al, indicating association between the fibrous xylem vessels and low gs, which could explain the Al-induced decrease in A in `Rangpur' lime plants. (C) 2016 Elsevier B.V. All rights reserved. (AU)

Processo FAPESP: 12/01351-9 - Estudo de espécies nativas do cerrado como fonte de recursos para superação da fitotoxicidade agrícola ao Al3+
Beneficiário:Gustavo Habermann
Linha de fomento: Auxílio à Pesquisa - Regular