How Does Diurnal and Nocturnal Warming Affect the Freezing Resistance of Antarctic Vascular Plants?
The Antarctic Peninsula has rapidly warmed up in past decades, and global warming has exhibited an asymmetric trend; therefore, it is interesting to understand whether nocturnal or diurnal warming is the most relevant for plant cold deacclimation. This study aimed to evaluate the effect of diurnal a...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-02-01
|
| Series: | Plants |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2223-7747/12/4/806 |
| _version_ | 1797618633124347904 |
|---|---|
| author | Dariel López Carolina Sanhueza Haroldo Salvo-Garrido Luisa Bascunan-Godoy León A. Bravo |
| author_facet | Dariel López Carolina Sanhueza Haroldo Salvo-Garrido Luisa Bascunan-Godoy León A. Bravo |
| author_sort | Dariel López |
| collection | DOAJ |
| description | The Antarctic Peninsula has rapidly warmed up in past decades, and global warming has exhibited an asymmetric trend; therefore, it is interesting to understand whether nocturnal or diurnal warming is the most relevant for plant cold deacclimation. This study aimed to evaluate the effect of diurnal and nocturnal warming on Antarctic vascular plant’s freezing resistance under laboratory conditions. This was studied by measuring the lethal temperature for 50% of tissue (LT<sub>50</sub>), ice nucleation temperature (INT), and freezing point (FP) on <i>Deschampsia antarctica</i> and <i>Colobanthus quitensis</i> plants. Additionally, soluble carbohydrates content and dehydrin levels were analyzed during nocturnal and diurnal temperatures increase. Nocturnal warming led to a 7 °C increase in the LT<sub>50</sub> of <i>D. antarctica</i> and reduced dehydrin-like peptide expression. Meanwhile, <i>C. quitensis</i> warmed plants reduce their LT<sub>50</sub> to about 3.6 °C. Both species reduce their sucrose content by more than 28% in warming treatments. Therefore, nocturnal warming leads to cold deacclimation in both plant species, while <i>C. quitensis</i> plants are also cold-deacclimated upon warm days. This suggests that even when the remaining freezing resistance of both species allows them to tolerate summer freezing events, <i>C. quitensis</i> can reach its boundaries of freezing vulnerability in the near future if warming in the Antarctic Peninsula progress. |
| first_indexed | 2024-03-11T08:15:17Z |
| format | Article |
| id | doaj.art-dd8fd5d1f1174dffb66e8d8ad894d0fc |
| institution | Directory Open Access Journal |
| issn | 2223-7747 |
| language | English |
| last_indexed | 2024-03-11T08:15:17Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Plants |
| spelling | doaj.art-dd8fd5d1f1174dffb66e8d8ad894d0fc2023-11-16T22:47:44ZengMDPI AGPlants2223-77472023-02-0112480610.3390/plants12040806How Does Diurnal and Nocturnal Warming Affect the Freezing Resistance of Antarctic Vascular Plants?Dariel López0Carolina Sanhueza1Haroldo Salvo-Garrido2Luisa Bascunan-Godoy3León A. Bravo4Departamento de Ciencias Agronómicas y Recursos Naturales, Facultad de Ciencias Agropecuarias y Medioambiente and Center of Plant, Soil Interactions and Natural Resources Biotechnology, Scientific and Technological Bioresource Nucleus, Universidad de La Frontera, Temuco 4811230, ChileLaboratorio de Fisiología Vegetal, Departamento de Botánica, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Concepción 4030000, ChileCentro de Genómica Nutricional Agroacuícola, Ciencia en Plantas, Temuco 4781158, ChileLaboratorio de Fisiología Vegetal, Departamento de Botánica, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Concepción 4030000, ChileDepartamento de Ciencias Agronómicas y Recursos Naturales, Facultad de Ciencias Agropecuarias y Medioambiente and Center of Plant, Soil Interactions and Natural Resources Biotechnology, Scientific and Technological Bioresource Nucleus, Universidad de La Frontera, Temuco 4811230, ChileThe Antarctic Peninsula has rapidly warmed up in past decades, and global warming has exhibited an asymmetric trend; therefore, it is interesting to understand whether nocturnal or diurnal warming is the most relevant for plant cold deacclimation. This study aimed to evaluate the effect of diurnal and nocturnal warming on Antarctic vascular plant’s freezing resistance under laboratory conditions. This was studied by measuring the lethal temperature for 50% of tissue (LT<sub>50</sub>), ice nucleation temperature (INT), and freezing point (FP) on <i>Deschampsia antarctica</i> and <i>Colobanthus quitensis</i> plants. Additionally, soluble carbohydrates content and dehydrin levels were analyzed during nocturnal and diurnal temperatures increase. Nocturnal warming led to a 7 °C increase in the LT<sub>50</sub> of <i>D. antarctica</i> and reduced dehydrin-like peptide expression. Meanwhile, <i>C. quitensis</i> warmed plants reduce their LT<sub>50</sub> to about 3.6 °C. Both species reduce their sucrose content by more than 28% in warming treatments. Therefore, nocturnal warming leads to cold deacclimation in both plant species, while <i>C. quitensis</i> plants are also cold-deacclimated upon warm days. This suggests that even when the remaining freezing resistance of both species allows them to tolerate summer freezing events, <i>C. quitensis</i> can reach its boundaries of freezing vulnerability in the near future if warming in the Antarctic Peninsula progress.https://www.mdpi.com/2223-7747/12/4/806asymmetric warmingclimate change<i>Colobanthus quitensis</i><i>Deschampsia antarctica</i>freezing resistancenight temperature |
| spellingShingle | Dariel López Carolina Sanhueza Haroldo Salvo-Garrido Luisa Bascunan-Godoy León A. Bravo How Does Diurnal and Nocturnal Warming Affect the Freezing Resistance of Antarctic Vascular Plants? Plants asymmetric warming climate change <i>Colobanthus quitensis</i> <i>Deschampsia antarctica</i> freezing resistance night temperature |
| title | How Does Diurnal and Nocturnal Warming Affect the Freezing Resistance of Antarctic Vascular Plants? |
| title_full | How Does Diurnal and Nocturnal Warming Affect the Freezing Resistance of Antarctic Vascular Plants? |
| title_fullStr | How Does Diurnal and Nocturnal Warming Affect the Freezing Resistance of Antarctic Vascular Plants? |
| title_full_unstemmed | How Does Diurnal and Nocturnal Warming Affect the Freezing Resistance of Antarctic Vascular Plants? |
| title_short | How Does Diurnal and Nocturnal Warming Affect the Freezing Resistance of Antarctic Vascular Plants? |
| title_sort | how does diurnal and nocturnal warming affect the freezing resistance of antarctic vascular plants |
| topic | asymmetric warming climate change <i>Colobanthus quitensis</i> <i>Deschampsia antarctica</i> freezing resistance night temperature |
| url | https://www.mdpi.com/2223-7747/12/4/806 |
| work_keys_str_mv | AT dariellopez howdoesdiurnalandnocturnalwarmingaffectthefreezingresistanceofantarcticvascularplants AT carolinasanhueza howdoesdiurnalandnocturnalwarmingaffectthefreezingresistanceofantarcticvascularplants AT haroldosalvogarrido howdoesdiurnalandnocturnalwarmingaffectthefreezingresistanceofantarcticvascularplants AT luisabascunangodoy howdoesdiurnalandnocturnalwarmingaffectthefreezingresistanceofantarcticvascularplants AT leonabravo howdoesdiurnalandnocturnalwarmingaffectthefreezingresistanceofantarcticvascularplants |