Differential photosynthetic plasticity of Amazonian tree species in response to light environments

ABSTRACT To investigate how and to what extent there are differences in the photosynthetic plasticity of trees in response to different light environments, six species from three successional groups (late successional, mid‐successional, and pioneers) were exposed to three different light environment...

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Published in:Plant biology (Stuttgart, Germany) Germany), 2024-06, Vol.26 (4), p.647-661
Main Authors: Nina Junior, A. d. R., Maia, J. M. F., Martins, S. V. C., Santos Nina, N. V., Costa, K. C. P., Carvalho, J. C., Schramm Mielke, M., Nunes‐Nesi, A., Araújo, W. L., Carvalho Gonçalves, J. F.
Format: Article
Language:English
Subjects:
Acclimation
Acclimatization
Carboxylation
Electron transport
Irradiance
Leaves
N partition
Partitioning
Photosynthesis
photosynthetic responses to light
Plant species
Plastic properties
Plasticity
Ribulose-bisphosphate carboxylase
Rubisco activation state
Shade
Stomata
Sunlight
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Summary:ABSTRACT To investigate how and to what extent there are differences in the photosynthetic plasticity of trees in response to different light environments, six species from three successional groups (late successional, mid‐successional, and pioneers) were exposed to three different light environments [deep shade – DS (5% full sunlight – FS), moderate shade – MS (35% FS) and full sunlight – FS]. Maximum net photosynthesis (Amax), leaf N partitioning, stomatal, mesophile, and biochemical limitations (SL, ML, and BL, respectively), carboxylation velocity (Vcmax), and electron transport (Jmax) rates, and the state of photosynthetic induction (IS) were evaluated. Higher values of Amax, Vcmax, and Jmax in FS were observed for pioneer species, which invested the largest amount of leaf N in Rubisco. The lower IS for pioneer species reveals its reduced ability to take advantage of sunflecks. In general, the main photosynthetic limitations are diffusive, with SL and ML having equal importance under FS, and ML decreasing along with irradiance. The leaf traits, which are more determinant of the photosynthetic process, respond independently in relation to the successional group, especially with low light availability. An effective partitioning of leaf N between photosynthetic and structural components played a crucial role in the acclimation process and determined the increase or decrease of photosynthesis in response to the light conditions. Variations in the photosynthetic plasticity of tropical trees.
ISSN:1435-8603
1438-8677
DOI:10.1111/plb.13632