Repositorio
Institucional

Sanhueza, Carolina

Cortes, Daniela

Way, Danielle A.

Fuentes, Francisca

Bascunan-Godoy, Luisa

Del-Saz, Nestor Fernandez

Saez, Patricia L.

Bravo, Leon A.

Cavieres, Lohengrin A.

Respiratory and Photosynthetic Responses of Antarctic Vascular Plants Are Differentially Affected by CO2 Enrichment and Nocturnal Warming

MDPI

PLANTS-BASEL

en

Projected rises in atmospheric CO2 concentration and minimum night-time temperatures may have important effects on plant carbon metabolism altering the carbon balance of the only two vascular plant species in the Antarctic Peninsula. We assessed the effect of nocturnal warming (8/5 degrees C vs. 8/8 degrees C day/night) and CO2 concentrations (400 ppm and 750 ppm) on gas exchange, non-structural carbohydrates, two respiratory-related enzymes, and mitochondrial size and number in two species of vascular plants. In Colobanthus quitensis, light-saturated photosynthesis measured at 400 ppm was reduced when plants were grown in the elevated CO2 or in the nocturnal warming treatments. Growth in elevated CO2 reduced stomatal conductance but nocturnal warming did not. The short-term sensitivity of respiration, relative protein abundance, and mitochondrial traits were not responsive to either treatment in this species. Moreover, some acclimation to nocturnal warming at ambient CO2 was observed. Altogether, these responses in C. quitensis led to an increase in the respiration-assimilation ratio in plants grown in elevated CO2. The response of Deschampsia antarctica to the experimental treatments was quite distinct. Photosynthesis was not affected by either treatment, however, respiration acclimated to temperature in the elevated CO2 treatment. The observed short-term changes in thermal sensitivity indicate type I acclimation of respiration. Growth in elevated CO2 and nocturnal warming resulted in a reduction in mitochondrial numbers and an increase in mitochondrial size in D. antarctica. Overall, our results suggest that with climate change D. antarctica could be more successful than C. quitensis, due to its ability to make metabolic adjustments to maintain its carbon balance.

artículo original

This research was funded by The National Fund for Scientific and Technological Development CONCYT/FONDECYT/Postdoctoral Grant N 3150221 and Fondecyt 1191118.

Esta investigación fue financiada por el Fondo Nacional de Desarrollo Científico y Tecnológico CONCYT/FONDECYT/Beca Postdoctoral N 3150221 y Fondecyt 1191118.

10.3390/plants11111520

PDF

atmospheric CO2 concentration

nocturnal warming

respiration

photosynthesis

foliar carbon balance

Antarctic plant species

ELEVATED ATMOSPHERIC CO2

LEAF DARK RESPIRATION

TEMPERATURE RESPONSE

THERMAL-ACCLIMATION

GROWTH TEMPERATURES

ELECTRON-TRANSPORT

NIGHT TEMPERATURE

ASSIMILATION RATE

CARBON

LIGHT

Ciencias de las plantas

Concentración de CO2 atmosférico

calentamiento nocturno

respiración

fotosíntesis

equilibrio de carbono foliar

especies de plantas antárticas

CO2 ATMOSFÉRICO ELEVADO

RESPIRACIÓN DE HOJAS OSCURAS

RESPUESTA A LA TEMPERATURA

ACCLIMACIÓN TÉRMICA

TEMPERATURAS DE CRECIMIENTO

TRANSPORTE ELECTRÓNICO

TEMPERATURA NOCTURNA

TASA DE ASIMILACIÓN

CARBONO

LUZ

Respiratory and Photosynthetic Responses of Antarctic Vascular Plants Are Differentially Affected by CO2 Enrichment and Nocturnal Warming

artículo original

version publicada

CC BY 4.0

CC BY 4.0

acceso abierto

acceso abierto

CONiCYT-FONDECYT 3150221

ANID-FONDECYT 1191118

CONICYT-FONDECYT 3150221

ANID FONDECYT 1191118

WOS:000808799500001