Cloud forest trees with higher foliar water uptake capacity and anisohydric behavior are more vulnerable to drought and climate change

Autor(es)

Eller, Cleiton B. ^[1] ; Lima, Aline L. ^[2] ; Oliveira, Rafael S. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Campinas UNICAMP, Dept Plant Biol, Inst Biol, CP6109, BR-13083970 Campinas, SP - Brazil

^[2] Univ Campinas UNICAMP, Ctr Studies & Environm Res NEPAM, BR-13083862 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: NEW PHYTOLOGIST; v. 211, n. 2, p. 489-501, JUL 2016.
• Citações Web of Science: 27

Resumo

Many tropical montane cloud forest (TMCF) trees are capable of foliar water uptake (FWU) during leaf-wetting events. In this study, we tested the hypothesis that maintenance of leaf turgor during periods of fog exposure and soil drought is related to species' FWU capacity. We conducted several experiments using apoplastic tracers, deuterium labeling and leaf immersion in water to evaluate differences in FWU among three common TMCF tree species. We also measured the effect of regular fog exposure on the leaf water potential of plants subjected to soil drought and used these data to model species' response to long-term drought. All species were able to absorb water through their leaf cuticles and/or trichomes, although the capacity to do so differed between species. During the drought experiment, the species with higher FWU capacity maintained leaf turgor for a longer period when exposed to fog, whereas the species with lower FWU exerted tighter stomatal regulation to maintain leaf turgor. Model results suggest that without fog, species with high FWU are more likely to lose turgor during seasonal droughts. We show that leaf-wetting events are essential for trees with high FWU, which tend to be more anisohydric, maintaining leaf turgor during seasonal droughts. (AU)

• Processo FAPESP: 11/52072-0 - Interações entre solo-vegetação-atmosfera em uma paisagem tropical em transformação
• Beneficiário: Rafael Silva Oliveira
• Modalidade de apoio: Auxílio à Pesquisa - Parceria para Inovação Tecnológica - PITE
• 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
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/19555-2 - Dinâmica de uso de água e balanço de carbono de espécies lenhosas de matas nebulares
• Beneficiário: Cleiton Breder Eller
• Modalidade de apoio: Bolsas no Brasil - Doutorado