Effects of soil water availability on foliar water uptake of Araucaria angustifolia

Autor(es)

Cassana, Francine F. ^[1] ; Eller, Cleiton B. ^[2] ; Oliveira, Rafael S. ^[2] ; Dillenburg, Lucia R. ^[3]

Afiliação do(s) autor(es)

^[1] Sul Riograndense Fed Inst Educ Sci & Technol, Pelotas - Brazil

^[2] Univ Estadual Campinas, Inst Biol, Dept Plant Biol, Campinas, SP - Brazil

^[3] Univ Fed Rio Grande Sul Sul, Inst Biosci, Dept Bot, Av Bento Goncalves 9500, BR-91501970 Porto Alegre, RS - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PLANT AND SOIL; v. 399, n. 1-2, p. 147-157, FEB 2016.
• Citações Web of Science: 12

Resumo

Foliar water uptake has been reported for different species, including conifers living in drought-prone environments. We conducted three experiments to determine whether leaves might absorb mist water and how this affects the water relations of well-watered and water-stressed young plants of Araucaria angustifolia. Three independent experiments were conducted using well-watered and water-stressed plants: immersion of shoot in water for the quantification of water uptake, the short-term exposure of plants to deuterium-enriched artificial mist, followed by the evaluation of plant water status and delta H-2 of xylem and soil water, and the use of the heat ratio method to measure the sap flow in saplings submitted to artificial mist. Foliar water uptake was demonstrated in both groups of plants, but only water-stressed plants showed a significant improvement of shoot water status. Isotope analyses indicated release of mist water in water-stressed plants rhizosphere's, and measurements of sap flow pointed to flow reversals in saplings exposed to mist, after a soil drought period. The results confirm the capacity of A. angustifolia for absorbing water deposited in its leaves and demonstrate that leaf-absorbed water can be transported through the xylem to the soil close to the roots and improve plant water status. (AU)

• Processo FAPESP: 10/17204-0 - Mudanças climáticas em montanhas brasileiras: respostas funcionais de plantas nativas de campos rupestres e campos de altitude a secas extremas
• Beneficiário: Rafael Silva Oliveira
• Linha de fomento: Auxílio à Pesquisa - Regular
• 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