Journal Title
Title of Journal: Trees
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Publisher
Springer-Verlag
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Authors: Matthew G Letts Jesús RodríguezCalcerrada Víctor Rolo Serge Rambal
Publish Date: 2011/09/07
Volume: 26, Issue: 2, Pages: 479-491
Abstract
Physiological and morphological plasticity are essential for growth and reproduction in contrasting light environments In dry forest ecosystems light generalists must also cope with the tradeoffs involved in synchronous acclimation to light availability and drought To understand how the broadleaf evergreen treeshrub Buxus sempervirens L common box inhabits both understory and successional terrain of Mediterranean forest we measured photosynthesis–fluorescence light response morphological traits and architectural characteristics across a light gradient Our results show that B sempervirens exhibits stress resistance syndrome with little change in net photosynthesis rate across a light availability gradient due to compensatory physiological and morphological acclimation Light energy processing and dissipation potential were highest in leaves of wellilluminated plants with higher electron transport rate fraction of open photosystem II reaction centres nonphotochemical quenching photorespiration and dark respiration In contrast traits reducing light capture efficiency were observed in high light shrubs including higher leaf mass per unit area leaf clumping leaf inclination and branch inclination We suggest that both physiological and morphological plasticity are required for B sempervirens to survive across a light gradient in a dry forest ecosystem while exhibiting homoeostasis in photosynthetic gas exchange We further speculate that the low growth rate of B sempervirens is effective in full sun only due to a lack of competition in low resource micrositesThis project was supported by funding from the University of Lethbridge Research Fund MGL photosynthesis equipment purchased through Western Economic Diversification Canada MGL a postdoctoral fellowship from the Spanish Ministry of Science and Innovation JRC and a scholarship from the Regional Government of Extremadura VR We thank Eva Rosenqvist for helpful advice on the construction of photosynthesis–fluorescence light response curves This work is a contribution to the Drought+ research program ANR06VULN00301 at the Centre d’Ecologie Fonctionnelle et Evolutive of the Centre National de la Recherche Scientifique CEFECNRS
Keywords:
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- Reference genes selection for quantitative gene expression studies in Pinus massoniana L.
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- Differences in morphology, gas exchange and root hydraulic conductance before planting in Pinus canariensis seedlings growing under different fertilization and light regimes
- Effects of leaf and branch removal on carbon assimilation and stem wood density of Eucalyptus grandis seedlings
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