The Pressure Is On – Epiphyte Water-Relations Altered Under Elevated CO2
| Autor: | Aidan Holohan, Sven P. Batke, Roisin Hayden, Christiana Evans-Fitz.Gerald, Wieland Fricke, Amanda S. Porter |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
Canopy Ecophysiology Stomatal conductance elevated CO2 biology Tillandsia Chemistry ecophysiology light conditions Turgor pressure Plant Science lcsh:Plant culture biology.organism_classification 010603 evolutionary biology 01 natural sciences turgor Horticulture climate change stomatal conductance lcsh:SB1-1110 Epiphyte Fern Phlebodium aureum 010606 plant biology & botany |
| Zdroj: | Frontiers in Plant Science, Vol 9 (2018) |
| ISSN: | 1664-462X |
| DOI: | 10.3389/fpls.2018.01758 |
| Popis: | Vascular epiphytes are a major biomass component of forests across the globe and they contribute to 9% of global vascular plant diversity. To improve our understanding of the whole-plant response of epiphytes to future climate change, we investigated for the first time both individual and combined effects of elevated CO2 (560 ppm) and light on the physiology and growth of two epiphyte species [Tillandsia brachycaulos (CAM) and Phlebodium aureum (C3)] grown for 272 days under controlled conditions. We found that under elevated CO2 the difference in water loss between the light (650 μmol m-2s-1) and shade (130 μmol m-2s-1) treatment was strongly reduced. Stomatal conductance (gs) decreased under elevated CO2, resulting in an approximate 40–45% reduction in water loss over a 24 h day/night period under high light and high CO2 conditions. Under lower light conditions water loss was reduced by approximately 20% for the CAM bromeliad under elevated CO2 and increased by approximately 126% for the C3 fern. Diurnal changes in leaf turgor and water loss rates correlated strong positively under ambient CO2 (400 ppm) and high light conditions. Future predicted increases in atmospheric CO2 are likely to alter plant water-relations in epiphytes, thus reducing the canopy cooling potential of epiphytes to future increases in temperature. |
| Databáze: | OpenAIRE |
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