Respiratory and Photosynthetic Responses of Antarctic Vascular Plants Are Differentially Affected by CO2 Enrichment and Nocturnal Warming
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 °C vs. 8/8 °C day...
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ftmdpi:oai:mdpi.com:/2223-7747/11/11/1520/ 2023-08-20T04:01:57+02:00 Respiratory and Photosynthetic Responses of Antarctic Vascular Plants Are Differentially Affected by CO2 Enrichment and Nocturnal Warming Carolina Sanhueza Daniela Cortes Danielle A. Way Francisca Fuentes Luisa Bascunan-Godoy Nestor Fernandez Del-Saz Patricia L. Sáez León A. Bravo Lohengrin A. Cavieres agris 2022-06-06 application/pdf https://doi.org/10.3390/plants11111520 EN eng Multidisciplinary Digital Publishing Institute Plant Response to Abiotic Stress and Climate Change https://dx.doi.org/10.3390/plants11111520 https://creativecommons.org/licenses/by/4.0/ Plants; Volume 11; Issue 11; Pages: 1520 atmospheric CO 2 concentration nocturnal warming respiration photosynthesis foliar carbon balance Antarctic plant species Text 2022 ftmdpi https://doi.org/10.3390/plants11111520 2023-08-01T05:17:18Z 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 °C vs. 8/8 °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. Text Antarc* Antarctic Antarctic Peninsula Antarctica MDPI Open Access Publishing Antarctic Antarctic Peninsula The Antarctic Plants 11 11 1520 |
institution |
Open Polar |
collection |
MDPI Open Access Publishing |
op_collection_id |
ftmdpi |
language |
English |
topic |
atmospheric CO 2 concentration nocturnal warming respiration photosynthesis foliar carbon balance Antarctic plant species |
spellingShingle |
atmospheric CO 2 concentration nocturnal warming respiration photosynthesis foliar carbon balance Antarctic plant species Carolina Sanhueza Daniela Cortes Danielle A. Way Francisca Fuentes Luisa Bascunan-Godoy Nestor Fernandez Del-Saz Patricia L. Sáez León A. Bravo Lohengrin A. Cavieres Respiratory and Photosynthetic Responses of Antarctic Vascular Plants Are Differentially Affected by CO2 Enrichment and Nocturnal Warming |
topic_facet |
atmospheric CO 2 concentration nocturnal warming respiration photosynthesis foliar carbon balance Antarctic plant species |
description |
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 °C vs. 8/8 °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. |
format |
Text |
author |
Carolina Sanhueza Daniela Cortes Danielle A. Way Francisca Fuentes Luisa Bascunan-Godoy Nestor Fernandez Del-Saz Patricia L. Sáez León A. Bravo Lohengrin A. Cavieres |
author_facet |
Carolina Sanhueza Daniela Cortes Danielle A. Way Francisca Fuentes Luisa Bascunan-Godoy Nestor Fernandez Del-Saz Patricia L. Sáez León A. Bravo Lohengrin A. Cavieres |
author_sort |
Carolina Sanhueza |
title |
Respiratory and Photosynthetic Responses of Antarctic Vascular Plants Are Differentially Affected by CO2 Enrichment and Nocturnal Warming |
title_short |
Respiratory and Photosynthetic Responses of Antarctic Vascular Plants Are Differentially Affected by CO2 Enrichment and Nocturnal Warming |
title_full |
Respiratory and Photosynthetic Responses of Antarctic Vascular Plants Are Differentially Affected by CO2 Enrichment and Nocturnal Warming |
title_fullStr |
Respiratory and Photosynthetic Responses of Antarctic Vascular Plants Are Differentially Affected by CO2 Enrichment and Nocturnal Warming |
title_full_unstemmed |
Respiratory and Photosynthetic Responses of Antarctic Vascular Plants Are Differentially Affected by CO2 Enrichment and Nocturnal Warming |
title_sort |
respiratory and photosynthetic responses of antarctic vascular plants are differentially affected by co2 enrichment and nocturnal warming |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2022 |
url |
https://doi.org/10.3390/plants11111520 |
op_coverage |
agris |
geographic |
Antarctic Antarctic Peninsula The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica |
op_source |
Plants; Volume 11; Issue 11; Pages: 1520 |
op_relation |
Plant Response to Abiotic Stress and Climate Change https://dx.doi.org/10.3390/plants11111520 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/plants11111520 |
container_title |
Plants |
container_volume |
11 |
container_issue |
11 |
container_start_page |
1520 |
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1774712342586589184 |