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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.)

Plant pneumatics: stem air flow is related to embolism - new perspectives on methods in plant hydraulics

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Autor(es):
Pereira, Luciano [1] ; Bittencourt, Paulo R. L. [1] ; Oliveira, Rafael S. [1] ; Junior, Mauro B. M. [1] ; Barros, Fernanda V. [1] ; Ribeiro, Rafael V. [1] ; Mazzafera, Paulo [1]
Número total de Autores: 7
Afiliação do(s) autor(es):
[1] Univ Estadual Campinas, Inst Biol, Dept Plant Biol, POB 6109, BR-13083970 Campinas, SP - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: NEW PHYTOLOGIST; v. 211, n. 1, p. 357-370, JUL 2016.
Citações Web of Science: 14
Resumo

Wood contains a large amount of air, even in functional xylem. Air embolisms in the xylem affect water transport and can determine plant growth and survival. Embolisms are usually estimated with laborious hydraulic methods, which can be prone to several artefacts. Here, we describe a new method for estimating embolisms that is based on air flow measurements of entire branches. To calculate the amount of air flowing out of the branch, a vacuum was applied to the cut bases of branches under different water potentials. We first investigated the source of air by determining whether it came from inside or outside the branch. Second, we compared embolism curves according to air flow or hydraulic measurements in 15 vessel- and tracheid-bearing species to test the hypothesis that the air flow is related to embolism. Air flow came almost exclusively from air inside the branch during the 2.5-min measurements and was strongly related to embolism. We propose a new embolism measurement method that is simple, effective, rapid and inexpensive, and that allows several measurements on the same branch, thus opening up new possibilities for studying plant hydraulics. (AU)

Processo FAPESP: 11/52072-0 - Interações entre solo-vegetação-atmosfera em uma paisagem tropical em transformação
Beneficiário:Rafael Silva Oliveira
Linha de fomento: Auxílio à Pesquisa - Parceria para Inovação Tecnológica - PITE