Journal ArticleDOI
The effect of growth irradiance on leaf anatomy and photosynthesis in Acer species differing in light demand
TLDR
Differences in light demand related to leaf acclimation to high light rather than that to low light in the Acer species, indicating that the response to water limitation plays an important role in leaf photosynthetic acclimations tohigh light in A. rufinerve.Abstract:
Variation in light demand is a major factor in determining the growth and survival of trees in a forest. There is strong relation between the light-demand and the effect of growth irradiance on leaf morphology and photosynthesis in three Acer species: A. rufinerve (light-demanding), A. mono (intermediate) and A. palmatum (shade-tolerant). The increase in mesophyll thickness and surface area of chloroplasts facing the intercellular airspaces (Sc) with growth irradiance was highest in A. rufinerve. Although the increase in light-saturated photosynthesis (Amax) was similar among the species, the increase in water use efficiency (WUE) was much higher in A. rufinerve than that in the other species, indicating that the response to water limitation plays an important role in leaf photosynthetic acclimation to high light in A. rufinerve. The low CO2 partial pressure at the carboxylation site (Cc) in A. rufinerve (130 µmol mol−1) at high irradiance was caused by low stomatal and internal conductance to CO2 diffusion, which minimized the increase in Amax in A. rufinerve despite its high Rubisco content. Under shade conditions, interspecific differences in leaf features were relatively small. Thus, difference in light demand related to leaf acclimation to high light rather than that to low light in the Acer species.read more
Citations
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Journal ArticleDOI
Mesophyll conductance to CO2: current knowledge and future prospects
TL;DR: There is now evidence that g(liq) and, in some cases, g(w), are the main determinants of g(m).
Journal ArticleDOI
Mesophyll diffusion conductance to CO2: an unappreciated central player in photosynthesis
Jaume Flexas,Margaret M. Barbour,Oliver Brendel,Hernán M. Cabrera,Marc Carriquí,Antonio Díaz-Espejo,Cyril Douthe,Erwin Dreyer,Juan Pedro Ferrio,Jorge Gago,Alexander Gallé,Jeroni Galmés,Naomi Kodama,Hipólito Medrano,Ülo Niinemets,José Javier Peguero-Pina,Alicia Pou,Miquel Ribas-Carbo,Magdalena Tomás,Tiina Tosens,Charles R. Warren +20 more
TL;DR: New evidence shows that anatomical traits, such as cell wall thickness and chloroplast distribution are amongst the stronger determinants of mesophyll conductance, although rapid variations in response to environmental changes might be regulated by other factors such as aquaporin conductance.
BookDOI
Handbook of Photosynthesis
TL;DR: The principles of Photosynthesis Mechanisms, Mechanisms of Photosynthetic Oxygen Evolution and the Fundamental Hypotheses of photosynthesis, and Recent Advances in Chloroplast Development in Higher Plants are explained.
Journal ArticleDOI
Rapid variations of mesophyll conductance in response to changes in CO2 concentration around leaves
Jaume Flexas,Antonio Díaz-Espejo,Jeroni Galmés,Ralf Kaldenhoff,Hipólito Medrano,Miquel Ribas-Carbo +5 more
TL;DR: Transgenic tobacco plants differing in the amounts of aquaporin NtAQP1 showed different slopes of the gm-Ci response, suggesting a possible role for aquaporins in mediating CO2 responsiveness of gm, and the importance of these findings is discussed in terms of their effects on parameterization of AN-CI curves.
Journal ArticleDOI
Resistances along the CO2 diffusion pathway inside leaves
TL;DR: The parameters in greatest need of additional measurements are S(c), mesophyll cell wall thickness, and the permeabilities of the plasma membrane and chloroplast envelope.
References
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Journal ArticleDOI
Some relationships between the biochemistry of photosynthesis and the gas exchange of leaves.
TL;DR: It was found that the response of the rate of CO2 Assimilation to irradiance, partial pressure of O2, p(O2), and temperature was different at low and high intercellular p(CO2), suggesting that CO2 assimilation rate is governed by different processes at lowand high inter cellular p (CO2).