Abstract
Tropical rainforest trees adjust leaf traits during ontogeny to cope with changes in the physical environment and maximize their carbon uptake. The aim of this study was to determine the plasticity index (PI) of leaf traits in understory and canopy leaves of six Amazonian tree species. In four of the six species the PI of leaf traits varied within species, and in four of the ten leaf traits assessed, the PI differed between species. The greatest PI values were found for stomatal density (Ds) and CO2-saturated photosynthesis, and the lowest ones were found for stomatal size, and leaf thickness. Despite the differences in PI values within species, the mean PI was similar in all the six species. As the saplings grow toward the canopy, the strategy to increase carbon uptake involves increasing Ds and leaf nitrogen and reducing stomatal size.
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Abbreviations
- Ds :
-
stomatal density
- E :
-
transpiration
- g s :
-
stomatal conductance
- Nleaf :
-
leaf nitrogen
- NUE:
-
nitrogen-use efficiency
- PI :
-
plasticity index
- P Nmax :
-
light-saturated net photosynthetic rate
- P Npot :
-
light and CO2-saturated net photosynthetic rate
- SLM:
-
specific leaf mass
- Ss :
-
stomatal size
- Tleaf :
-
fresh leaf thickness
- WUE:
-
water-use efficiency
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Acknowledgements: We thank to the Ministry of Science, Technology, Innovation and Communication and to the Research Foundation for the State of the Amazon (FAPEAM; grant number: UA 6203164-20.12) for financial support, and the National Council for Scientific and Technological Development (CNPq) for scholarships. We are also grateful to the anonymous reviewers and the Associate Editor for the important comments and suggestions.
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Marenco, R.A., Camargo, M.A.B., Antezana-Vera, S.A. et al. Leaf trait plasticity in six forest tree species of central Amazonia. Photosynthetica 55, 679–688 (2017). https://doi.org/10.1007/s11099-017-0703-6
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DOI: https://doi.org/10.1007/s11099-017-0703-6