Responses to Different Quantum Flux Densities

Björkman, Olle

doi:10.1007/978-3-642-68090-8_4

Cited by 981 publications

(773 citation statements)

References 104 publications

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“…No entanto, isso aumenta significativamente o volume do mesofilo por área foliar, o que pode ser importante para a as trocas gasosas em condições de elevada irradiância ou restrição hídrica (BJÖRKMAN, 1981;VOLTAN et al, 1992).…”

Section: Resultsunclassified

“…Uma variedade de fatores ambientais, especialmente a disponibilidade de radiação, pode causar alterações nas características estruturais e funcionais das folhas, culminando com alterações no padrão de crescimento e produção das plantas (BJÖRKMAN, 1981). Plantas que apresentam plasticidade morfofisiológica, ou seja, capacidade de aclimatação a diferentes condições de ambiente, são capazes de responder diferencialmente a níveis de radiação no ambiente por alterações anatômicas, morfológicas e fotossintéticas (PANDEY & KUSHWAHA, 2005;OGUCHI et al, 2005).…”

Section: Introductionunclassified

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Alterações morfofisiológicas em folhas de Coffea arabica L. cv. "Oeiras" sob influência do sombreamento por Acacia mangium Willd

et al. 2008

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Section: Resultsunclassified

Section: Introductionunclassified

Alterações morfofisiológicas em folhas de Coffea arabica L. cv. "Oeiras" sob influência do sombreamento por Acacia mangium Willd

et al. 2008

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“…Shade-acclimated leaves contain higher Chl per unit of mass than sun leaves, which is related to increased allocation of resources to light-harvesting functions rather than in electron transport and CO 2 fixation capacity (Björkman, 1981;Walters, 2005). However, in H. courbaril the highest Chl contents (a, b and total) were detected in leaves under high light conditions.…”

Section: Light and Co 2 Response Curvesmentioning

confidence: 93%

“…Comparisons between early and late successional species suggest that these two groups generally exhibit different capacities for light acclimation (Björkman, 1981;Strauss-Debenedetti and Bazzaz, 1996;Valladares et al, 2000;Cai et al, 2005). Light acclimation is the process that allows environmentally induced changes in the photosynthetic utilisation of light, depending upon the irradiance regime under which leaves develop, involving a complex set of physiological, biochemical and structural responses that can increase the capacity to exploit light (Björkman, 1981).…”

Section: Introductionmentioning

confidence: 99%

“…Light acclimation is the process that allows environmentally induced changes in the photosynthetic utilisation of light, depending upon the irradiance regime under which leaves develop, involving a complex set of physiological, biochemical and structural responses that can increase the capacity to exploit light (Björkman, 1981). We consider, from here on, photosynthetic plasticity as a particular expression of phenotypic plasticity.…”

Section: Introductionmentioning

confidence: 99%

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Evidence of higher photosynthetic plasticity in the early successional Guazuma ulmifolia Lam. compared to the late successional Hymenaea courbaril L. grown in contrasting light environments

Portes

Damineli²,

Ribeiro³

et al. 2010

Braz. J. Biol.

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The present study investigated changes in photosynthetic characteristics of Guazuma ulmifolia Lam. (early successional species) and Hymenaea courbaril L. (late successional species) grown in contrasting light conditions as a way of assessing photosynthetic plasticity. Early successional species typically inhabit gap environments being exposed to variability in multiple resources, hence it is expected that these species would show higher photosynthetic plasticity than late successional ones. In order to test this hypothesis, light and CO 2 response curves and chlorophyll content (Chl) were measured in plants grown in high and low light environments. G. ulmifolia presented the highest amounts of both Chl a and b, especially in the low light, and both species presented higher Chl a than b in both light conditions. The Chl a/b ratio was higher in high light leaves of both species and greater in G. ulmifolia. Taken together, these results evidence the acclimation potential of both species, reflecting the capacity to modulate light harvesting complexes according to the light environment. However, G. ulmifolia showed evidence of higher photosynthetic plasticity, as indicated by the greater amplitude of variation on photosynthetic characteristics between environments shown by more significant shade adjusted parameters (SAC) and principal component analysis (PCA). Thus, the results obtained were coherent with the hypothesis that the early successional species G. ulmifolia exhibits higher photosynthetic plasticity than the late successional species H. courbaril.Keywords: leaf gas exchange, light and CO 2 photosynthetic responses, photosynthetic plasticity, plant ecophysiology, tropical forest succession. Evidências de maior plasticidade fotossintética na pioneira

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Physiology and Biochemistry of Photosynthesis and Algal Carbon Acquisition

Geider¹,

MacIntyre²

2002

Phytoplankton Productivity

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Responses to Different Quantum Flux Densities

Cited by 981 publications

References 104 publications

Alterações morfofisiológicas em folhas de Coffea arabica L. cv. "Oeiras" sob influência do sombreamento por Acacia mangium Willd

Alterações morfofisiológicas em folhas de Coffea arabica L. cv. "Oeiras" sob influência do sombreamento por Acacia mangium Willd

Evidence of higher photosynthetic plasticity in the early successional Guazuma ulmifolia Lam. compared to the late successional Hymenaea courbaril L. grown in contrasting light environments

Physiology and Biochemistry of Photosynthesis and Algal Carbon Acquisition

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