Repositorio
Institucional

Saez, Patricia L.

Galmes, Jeroni#Ramirez, Constanza F.#Poblete, Leticia#Rivera, Betsy K.#Cavieres, Lohengrin A.#Jose Clemente-Moreno, Maria#Flexas, Jaume#Bravo, Leon A.

Mesophyll conductance to CO2 is the most significant limitation to photosynthesis at different temperatures and water availabilities in Antarctic vascular species

PERGAMON-ELSEVIER SCIENCE LTD

ENVIRONMENTAL AND EXPERIMENTAL BOTANY

en

The impact of climate change on Antarctic plants is not only associated to the effect of increased temperature but also strongly modulated by water availability (WA) illustrating the importance of this factor in predicting responses to warming. The aim of this study was to evaluate the effect of temperature and WA on the photosynthetic performance and photosynthetic limitations of the only two Antarctic vascular species: Deschampsia antarctica and Colobanthus quitensis. We hypothesize that: the ability of Antarctic plants to increase their net CO2 assimilation (A(N)) in response to raising growth temperature would be constrained by mesophyll conductance (g(m)), and decreases in water availability may counteract any benefit in carbon gain obtained upon increasing temperature. To address this issue, both species were grown (T-g) and measured (T-m) at three different temperatures (5, 10 and 16 degrees C). Furthermore, two different irrigation conditions (well-watered, WW, and water-deficit, WD) were applied at 16 degrees C. Gas-exchange measurements showed that A(N) and their underlying diffusive (g(s) and g(m)) and biochemical components (V-cmax) were mainly determined by T-g and, to a lesser extent by T-m. Warmer conditions favor A(N) of both species, although D. antarctica requires higher increases of temperature to show the same response. Changes in A(N) in response to either temperature or WA are due to proportional concomitant changes of stomatal and mesophyll conductances, and carboxylation capacity. However, g(m) remains the most important limitation at any environmental condition. Reduced WA can completely counteract any benefit to photosynthesis induced by raising temperature, suggesting that these species may present a quite homeostatic photosynthetic response to the climate changes predicted for the Antarctic region.

Artículo original

This research was funded by The National Fund for Scientific and Technological Development (Grant no.11130332), The Associative Research Program of CONICYT (Grant no. PIA ART-1102), The Support Program for the Formation of International Networks between Research Centers (Grant no. REDES-170102) and The Chilean Antarctic Institute (Grant no. FI-02-13). The work of JF and MJC on mesophyll conductance is supported by the Ministerio de Economia y Competitividad (Grant no.CTM2014-53902-C2-1-P) and the ERDF (FEDER). The authors also thank to H. Arctowski Polish Antarctic Station.

Esta investigación fue financiada por el Fondo Nacional para el Desarrollo Científico y Tecnológico (subvención n.° 11130332), el Programa de Investigación Asociativa de CONICYT (subvención n.° PIA ART-1102), el Programa de Apoyo a la Formación de Redes Internacionales entre Centros de Investigación (subvención n.° REDES-170102) y el Instituto Antártico Chileno (subvención n.° FI-02-13). El trabajo de JF y MJC sobre la conductancia del mesófilo cuenta con el apoyo del Ministerio de Economía y Competitividad (subvención n.° CTM2014-53902-C2-1-P) y el Fondo Europeo de Desarrollo Regional (FEDER). Los autores también agradecen a la Estación Antártica Polaca H. Arctowski.

10.1016/j.envexpbot.2018.09.008

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C. quitensis# D. antarctica# Climate change# Photosynthesis# Mesophyll conductance# Temperature# Water availability

http://dx.doi.org/10.1016/j.envexpbot.2018.09.008

Plant Sciences# Environmental Sciences

C. quitensis# D. Antártida# Cambio climático# Fotosíntesis# conductancia del mesófilo# Temperatura# Disponibilidad de agua

Botánica

Ecología

Climatología

WOS:000448093600027

Mesophyll conductance to CO₂ is the most significant limitation to photosynthesis at different temperatures and water availabilities in Antarctic vascular species

Artículo original

version publicada

PERGAMON-ELSEVIER SCIENCE LTD

ENVIRONMENTAL AND EXPERIMENTAL BOTANY

Ciencias Vegetales# Ciencias Ambientales

0098-8472

en

ANID CONICYT PIA ART-1102#REDES-170102#INACH FI-02-13#MINECO CTM2014-53902-C2-1-P#

ANID 11130332

ANID CONICYT PIA ART-1102

ANID REDES-170102

INACH FI-02-13

MINECO CTM2014-53902-C2-1-P

ERDF

This research was funded by The National Fund for Scientific and Technological Development (Grant no.11130332), The Associative Research Program of CONICYT (Grant no. PIA ART-1102), The Support Program for the Formation of International Networks between Research Centers (Grant no. REDES-170102) and The Chilean Antarctic Institute (Grant no. FI-02-13). The work of JF and MJC on mesophyll conductance is supported by the Ministerio de Economia y Competitividad (Grant no.CTM2014-53902-C2-1-P) and the ERDF (FEDER). The authors also thank to H. Arctowski Polish Antarctic Station.

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