Differentiation of leaf water flux and drought tolerance traits in hemiepiphytic and non-hemiepiphytic Ficus tree species

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1. Leaf structural and physiological traits are associated with growth form and habitat, but little is known of the specific traits associated with hemiepiphytes, which are an important component of many tropical forests. Given their life history that includes a drought prone epiphytic stage, hemiep...

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Autores principales: Hao, G.-Y., Sack, L., Wang, A.-Y., Cao, K.-F., Goldstein, G.
Formato: Artículo publishedVersion
Lenguaje:Inglés
Publicado: 2010
Materias:
Leaf hydraulics
Rainforest
Stomatal control
Water relations
desiccation
dicotyledon
divergence
drought resistance
ecophysiology
epiphyte
growth form
leaf
life history
stomatal conductance
tropical forest
water flow
water relations
water use
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_02698463_v24_n4_p731_Hao
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paperaa:paper_02698463_v24_n4_p731_Hao2023-06-12T16:47:12Z Differentiation of leaf water flux and drought tolerance traits in hemiepiphytic and non-hemiepiphytic Ficus tree species Funct. Ecol. 2010;24(4):731-740 Hao, G.-Y. Sack, L. Wang, A.-Y. Cao, K.-F. Goldstein, G. Leaf hydraulics Rainforest Stomatal control Water relations desiccation dicotyledon divergence drought resistance ecophysiology epiphyte growth form leaf life history stomatal conductance tropical forest water flow water relations water use 1. Leaf structural and physiological traits are associated with growth form and habitat, but little is known of the specific traits associated with hemiepiphytes, which are an important component of many tropical forests. Given their life history that includes a drought prone epiphytic stage, hemiepiphytes should be expected to have more drought tolerance-related traits than co-occurring terrestrial species. 2. The genus Ficus includes woody hemiepiphytes distributed in tropical areas throughout the world. Traits related to the flux of water through the leaf and to drought adaptations were studied in five hemiephiphytic (H) and five non-hemiepiphytic (NH) Ficus tree species grown in a common garden to determine genetically based differences. 3. Leaves of H and NH species differed substantially in structure and physiology; on average, H species had smaller leaves with higher leaf mass per unit area, thicker epidermis, smaller vessel lumen diameters in petioles and lower petiole hydraulic conductivity. Leaf traits also indicated stronger drought tolerance in H species, including lower epidermal conductance and turgor loss point and earlier stomatal closure with desiccation than NH species. Across H and NH species, traits related to water flux capacity were negatively correlated with traits related to drought tolerance. 4. The divergences in hydraulics and water relations between growth forms for these closely related species reflected specialization according to contrasting habitat and life form. Conservative water use and increased ability of leaves to persist under severe drought would provide an advantage for H species, especially during the epiphytic phase, while the higher potential water use of NH species would be associated with higher assimilation rates and competitiveness under high water supply. 5. The results indicate a trade-off between leaf water flux capacity and leaf drought tolerance across these hemiephiphytic and non-hemiepiphytic species. Species adaptation to habitats with contrasting demands on leaf function may lead to divergence along a leaf water-flux-drought-tolerance spectrum. © 2010 The Authors. Journal compilation © 2010 British Ecological Society. Fil:Goldstein, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2010 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion application/pdf eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_02698463_v24_n4_p731_Hao
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
language Inglés
orig_language_str_mv eng
topic Leaf hydraulics
Rainforest
Stomatal control
Water relations
desiccation
dicotyledon
divergence
drought resistance
ecophysiology
epiphyte
growth form
leaf
life history
stomatal conductance
tropical forest
water flow
water relations
water use
spellingShingle Leaf hydraulics
Rainforest
Stomatal control
Water relations
desiccation
dicotyledon
divergence
drought resistance
ecophysiology
epiphyte
growth form
leaf
life history
stomatal conductance
tropical forest
water flow
water relations
water use
Hao, G.-Y.
Sack, L.
Wang, A.-Y.
Cao, K.-F.
Goldstein, G.
Differentiation of leaf water flux and drought tolerance traits in hemiepiphytic and non-hemiepiphytic Ficus tree species
topic_facet Leaf hydraulics
Rainforest
Stomatal control
Water relations
desiccation
dicotyledon
divergence
drought resistance
ecophysiology
epiphyte
growth form
leaf
life history
stomatal conductance
tropical forest
water flow
water relations
water use
description 1. Leaf structural and physiological traits are associated with growth form and habitat, but little is known of the specific traits associated with hemiepiphytes, which are an important component of many tropical forests. Given their life history that includes a drought prone epiphytic stage, hemiepiphytes should be expected to have more drought tolerance-related traits than co-occurring terrestrial species. 2. The genus Ficus includes woody hemiepiphytes distributed in tropical areas throughout the world. Traits related to the flux of water through the leaf and to drought adaptations were studied in five hemiephiphytic (H) and five non-hemiepiphytic (NH) Ficus tree species grown in a common garden to determine genetically based differences. 3. Leaves of H and NH species differed substantially in structure and physiology; on average, H species had smaller leaves with higher leaf mass per unit area, thicker epidermis, smaller vessel lumen diameters in petioles and lower petiole hydraulic conductivity. Leaf traits also indicated stronger drought tolerance in H species, including lower epidermal conductance and turgor loss point and earlier stomatal closure with desiccation than NH species. Across H and NH species, traits related to water flux capacity were negatively correlated with traits related to drought tolerance. 4. The divergences in hydraulics and water relations between growth forms for these closely related species reflected specialization according to contrasting habitat and life form. Conservative water use and increased ability of leaves to persist under severe drought would provide an advantage for H species, especially during the epiphytic phase, while the higher potential water use of NH species would be associated with higher assimilation rates and competitiveness under high water supply. 5. The results indicate a trade-off between leaf water flux capacity and leaf drought tolerance across these hemiephiphytic and non-hemiepiphytic species. Species adaptation to habitats with contrasting demands on leaf function may lead to divergence along a leaf water-flux-drought-tolerance spectrum. © 2010 The Authors. Journal compilation © 2010 British Ecological Society.
format Artículo
Artículo
publishedVersion
author Hao, G.-Y.
Sack, L.
Wang, A.-Y.
Cao, K.-F.
Goldstein, G.
author_facet Hao, G.-Y.
Sack, L.
Wang, A.-Y.
Cao, K.-F.
Goldstein, G.
author_sort Hao, G.-Y.
title Differentiation of leaf water flux and drought tolerance traits in hemiepiphytic and non-hemiepiphytic Ficus tree species
title_short Differentiation of leaf water flux and drought tolerance traits in hemiepiphytic and non-hemiepiphytic Ficus tree species
title_full Differentiation of leaf water flux and drought tolerance traits in hemiepiphytic and non-hemiepiphytic Ficus tree species
title_fullStr Differentiation of leaf water flux and drought tolerance traits in hemiepiphytic and non-hemiepiphytic Ficus tree species
title_full_unstemmed Differentiation of leaf water flux and drought tolerance traits in hemiepiphytic and non-hemiepiphytic Ficus tree species
title_sort differentiation of leaf water flux and drought tolerance traits in hemiepiphytic and non-hemiepiphytic ficus tree species
publishDate 2010
url http://hdl.handle.net/20.500.12110/paper_02698463_v24_n4_p731_Hao
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