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Large differences in leaf cuticle conductance and its temperature response among 24 tropical tree species from across a rainfall gradient
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Large differences in leaf cuticle conductance and its temperature response among 24 tropical tree species from across a rainfall gradient
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Journal Article
Large differences in leaf cuticle conductance and its temperature response among 24 tropical tree species from across a rainfall gradient
2021
Overview
• More frequent droughts and rising temperatures pose serious threats to tropical forests. When stomata are closed under dry and hot conditions, plants lose water through leaf cuticles, but little is known about cuticle conductance (g
min) of tropical trees, how it varies among species and environments, and how it is affected by temperature.
• We determined g
min in relation to temperature for 24 tropical tree species across a steep rainfall gradient in Panama, by recording leaf drying curves at different temperatures in the laboratory.
• In contrast with our hypotheses, g
min did not differ systematically across the rainfall gradient; species differences did not reflect phylogenetic patterns; and in most species g
min did not significantly increase between 25 and 50°C. g
min was higher in deciduous than in evergreen species, in species with leaf trichomes than in species without, in sun leaves than in shade leaves, and tended to decrease with increasing leaf mass per area across species. There was no relationship between stomatal and cuticle conductance.
• Large species differences in g
min and its temperature response suggest that more frequent hot droughts may lead to differential survival among tropical tree species, regardless of species’ position on the rainfall gradient.
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