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Stronger seasonal adjustment in leaf turgor loss point in lianas than trees in an Amazonian forest

Journal Article

Marechaux I; Bartlett MK; Iribar A; Sack L; Chave J

2017

Biology Letters

13

43834

Pan-tropically liana density increases with decreasing rainfall and increasing seasonality. This pattern has led to the hypothesis that lianas display a growth advantage over trees under dry conditions. However the physiological mechanisms underpinning this hypothesis remain elusive. A key trait influencing leaf and plant drought tolerance is the leaf water potential at turgor loss point (ptlp). ptlp adjusts under drier conditions and this contributes to improved leaf drought tolerance. For co-occurring Amazonian tree (n = 247) and liana (n = 57) individuals measured during the dry and the wet seasons lianas showed a stronger osmotic adjustment than trees. Liana leaves were less drought-tolerant than trees in the wet season but reached similar drought tolerances during the dry season. Stronger osmotic adjustment in lianas would contribute to turgor maintenance a critical prerequisite for carbon uptake and growth and to the success of lianas relative to trees in growth under drier conditions.

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The Liana Ecology Project is supported by Marquette University and funded in part by the National Science Foundation.