Cell-level anatomical characteristics explain high mesophyll conductance and photosynthetic capacity in sclerophyllous Mediterranean oaks
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Date
2016
Authors
Peguero Pina, José JavierSiso, S.
Flexas, J
Galmes, J
Garcia-Nogales, A
Niinemets, U
Sancho Knapik, Domingo
Saz, MA
Gil Pelegrín, Eustaquio
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articleArticle
Abstract
Leaf mass per area (LMA) has been suggested to negatively affect the mesophyll conductance to CO2 (g(m)), which is the most limiting factor for area-based photosynthesis (A(N)) in many Mediterranean sclerophyll species. However, despite their high LMA, these species have similar A(N) to plants from other biomes. Variations in other leaf anatomical traits, such as mesophyll and chloroplast surface area exposed to intercellular air space (S-m/S and S-c/S), may offset the restrictions imposed by high LMA in g(m) and A(N) in these species. Seven sclerophyllous Mediterranean oaks from Europe/North Africa and North America with contrasting LMA were compared in terms of morphological, anatomical and photosynthetic traits. Mediterranean oaks showed specific differences in A(N) that go beyond the common morphological leaf traits reported for these species (reduced leaf area and thick leaves). These variations resulted mainly from the differences in g(m), the most limiting factor for carbon assimilation in these species. Species with higher A(N) showed increased S-c/S, which implies increased g(m) without changes in stomatal conductance. The occurrence of this anatomical adaptation at the cell level allowed evergreen oaks to reach A(N) values comparable to congeneric deciduous species despite their higher LMA.
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Bibliographic citation
Peguero-Pina, J. J., Sisó, S., Flexas, J., Galmés, J., García-Nogales, A., Niinemets, Ü., Sancho-Knapik, D., Saz, M. Á., & Gil-Pelegrín, E. (2017). Cell-level anatomical characteristics explain high mesophyll conductance and photosynthetic capacity in sclerophyllous Mediterranean oaks. New Phytologist, 214(2), 585-596. https://doi.org/10.1111/nph.14406
AGROVOC subjects
QuercusClima mediterráneo
Fotosíntesis
Mesofilo
Conductancia foliar
Superficie foliar
Other field subjects
Quercusanatomical adaptations
CO2 TRANSFER CONDUCTANCE
DIFFERENT LIGHT
DIFFUSION CONDUCTANCE
EVERGREEN-SCLEROPHYLLS
LEAF DRY MASS
LEAF ECONOMICS SPECTRUM
leaf mass per area (LMA)
Limitations
Mediterranean-type climate
mesophyll conductance (g ) m
mesophyll conductance (g ) m
mesophyll conductance (g(m))
mesophyll conductance (gm)
Photosynthesis
Quercus
QUERCUS-COCCIFERA L.
Sclerophylly
Seasonal-Changes
Severe Drought
STOMATAL RESPONSES
Water relations
Sponsorship
Se agradece el apoyo financiero del Gobierno de Aragón (grupo de investigación H38). El trabajo de Domingo Sancho Knapik está financiado por un contrato DOC INIA cofinanciado por el Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA) de España y el Fondo Social Europeo (FSE).