Mesophyll conductance constrains photosynthesis in three common sclerophyllous species in Central Chile

BACKGROUND: Quillaja saponaria Mol., Cryptocarya alba Mol. Looser, and Lithraea caustica Molina Hook et Arn., are common sclerophyllous species in Mediterranean Central Chile. Mesophyll conductance, g m, may strongly limit photosynthesis in these semiarid environments. RESULTS: Simultaneous measurem...

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Autores principales:	Brito,Carla E, Bown,Horacio E, Fuentes,Juan-Pablo, Franck,Nicolás, Perez-Quezada,Jorge F
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2014
Materias:	Chloroplastic CO2 concentration Electron transport Mesophyll conductance Rubisco carboxylation Sclerophyllous species
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2014000100008
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spelling	oai:scielo:S0716-078X20140001000082015-07-23Mesophyll conductance constrains photosynthesis in three common sclerophyllous species in Central ChileBrito,Carla EBown,Horacio EFuentes,Juan-PabloFranck,NicolásPerez-Quezada,Jorge F Chloroplastic CO2 concentration Electron transport Mesophyll conductance Rubisco carboxylation Sclerophyllous species BACKGROUND: Quillaja saponaria Mol., Cryptocarya alba Mol. Looser, and Lithraea caustica Molina Hook et Arn., are common sclerophyllous species in Mediterranean Central Chile. Mesophyll conductance, g m, may strongly limit photosynthesis in these semiarid environments. RESULTS: Simultaneous measurements of gas exchange and chlorophyll fluorescence were carried out in 45 nursery plants from these species to determine diffusional and biochemical limitations to photosynthesis. Values of stomatal conductance, g s, were greater than those of mesophyll conductance, g m, while their ratio (g m/g s) was not influenced by species being on average 0.47. Relative limitations posed by mesophyll conductance to photosynthesis, Lm, (0.40 ± 0.02) were high compared to those imposed by stomata, Ls (0.07 ± 0.01). The average CO2 concentration in the intercellular air spaces (Ci) was 32 µmol mol-1 lower than in the atmosphere (Ca), while the average CO2 concentration in the chloroplasts (Cc) was 131 µmol mol-1 lower than Ci independent of species. Maximal rates of Rubisco carboxylation, Vcmax, and maximal electron transport rates driving regeneration of RuBP, Jmax, ranged from 13 to 66 µmol CO2 m-2 s-1 and from 33 to 148 µmol electrons m-2 s-1, respectively, and compare well to averages for C3 plants. CONCLUSIONS: Photosynthetic performance was in the series: Q. saponaria > C. alba ≥ L. caustica, which can be attributed first to mesophyll conductance limitations, probably mediated by leaf anatomical traits and then to species specific foliage N partitioning strategies.info:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.87 20142014-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2014000100008en10.1186/s40693-014-0008-0
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Chloroplastic CO2 concentration Electron transport Mesophyll conductance Rubisco carboxylation Sclerophyllous species
spellingShingle	Chloroplastic CO2 concentration Electron transport Mesophyll conductance Rubisco carboxylation Sclerophyllous species Brito,Carla E Bown,Horacio E Fuentes,Juan-Pablo Franck,Nicolás Perez-Quezada,Jorge F Mesophyll conductance constrains photosynthesis in three common sclerophyllous species in Central Chile
description	BACKGROUND: Quillaja saponaria Mol., Cryptocarya alba Mol. Looser, and Lithraea caustica Molina Hook et Arn., are common sclerophyllous species in Mediterranean Central Chile. Mesophyll conductance, g m, may strongly limit photosynthesis in these semiarid environments. RESULTS: Simultaneous measurements of gas exchange and chlorophyll fluorescence were carried out in 45 nursery plants from these species to determine diffusional and biochemical limitations to photosynthesis. Values of stomatal conductance, g s, were greater than those of mesophyll conductance, g m, while their ratio (g m/g s) was not influenced by species being on average 0.47. Relative limitations posed by mesophyll conductance to photosynthesis, Lm, (0.40 ± 0.02) were high compared to those imposed by stomata, Ls (0.07 ± 0.01). The average CO2 concentration in the intercellular air spaces (Ci) was 32 µmol mol-1 lower than in the atmosphere (Ca), while the average CO2 concentration in the chloroplasts (Cc) was 131 µmol mol-1 lower than Ci independent of species. Maximal rates of Rubisco carboxylation, Vcmax, and maximal electron transport rates driving regeneration of RuBP, Jmax, ranged from 13 to 66 µmol CO2 m-2 s-1 and from 33 to 148 µmol electrons m-2 s-1, respectively, and compare well to averages for C3 plants. CONCLUSIONS: Photosynthetic performance was in the series: Q. saponaria > C. alba ≥ L. caustica, which can be attributed first to mesophyll conductance limitations, probably mediated by leaf anatomical traits and then to species specific foliage N partitioning strategies.
author	Brito,Carla E Bown,Horacio E Fuentes,Juan-Pablo Franck,Nicolás Perez-Quezada,Jorge F
author_facet	Brito,Carla E Bown,Horacio E Fuentes,Juan-Pablo Franck,Nicolás Perez-Quezada,Jorge F
author_sort	Brito,Carla E
title	Mesophyll conductance constrains photosynthesis in three common sclerophyllous species in Central Chile
title_short	Mesophyll conductance constrains photosynthesis in three common sclerophyllous species in Central Chile
title_full	Mesophyll conductance constrains photosynthesis in three common sclerophyllous species in Central Chile
title_fullStr	Mesophyll conductance constrains photosynthesis in three common sclerophyllous species in Central Chile
title_full_unstemmed	Mesophyll conductance constrains photosynthesis in three common sclerophyllous species in Central Chile
title_sort	mesophyll conductance constrains photosynthesis in three common sclerophyllous species in central chile
publisher	Sociedad de Biología de Chile
publishDate	2014
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2014000100008
work_keys_str_mv	AT britocarlae mesophyllconductanceconstrainsphotosynthesisinthreecommonsclerophyllousspeciesincentralchile AT bownhoracioe mesophyllconductanceconstrainsphotosynthesisinthreecommonsclerophyllousspeciesincentralchile AT fuentesjuanpablo mesophyllconductanceconstrainsphotosynthesisinthreecommonsclerophyllousspeciesincentralchile AT francknicolas mesophyllconductanceconstrainsphotosynthesisinthreecommonsclerophyllousspeciesincentralchile AT perezquezadajorgef mesophyllconductanceconstrainsphotosynthesisinthreecommonsclerophyllousspeciesincentralchile
_version_	1718439690764288000

Mesophyll conductance constrains photosynthesis in three common sclerophyllous species in Central Chile

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