Freezing temperature effects on photosystem II in Antarctic lichens evaluated by chlorophyll fluorescence
Copyright © 2024 Elsevier GmbH. All rights reserved..
This study explores and compares the limits for photosynthesis in subzero temperatures of six Antarctic lichens: Sphaerophorus globosus, Caloplaca regalis, Umbilicaria antarctica, Pseudephebe minuscula, Parmelia saxatilis and Lecania brialmontii combining linear cooling and chlorophyll fluorescence methods. The results revealed triphasic S-curves in the temperature response of the maximum quantum yield (FV/FM) and effective quantum yield of photosystem II (ΦPSII) for all species. All investigated species showed a high level of cryoresistance with critical temperatures (Tc) below -20 °C. However, record low Tc temperatures have been discovered for L. brialmotii (-54 °C for FV/FM and -40 °C for ΦPSII) and C. regalis (-52 °C for FV/FM and -38 °C for ΦPSII). Additionally, the yield differentials (FV/FM - ΦPSII) in functions of temperature revealed one or two peaks, with the larger one occurring for temperatures below -20 °C for the above-mentioned species. Finally, Kautsky kinetics were measured and compared at different temperatures (20 °C, 10 °C, 0 °C and -10 °C and then -10 °C after 1 h of incubation). This research serves as a foundation for further developing investigations into the biophysical mechanisms by which photosynthesis is carried out at subzero temperatures.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2024 |
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| Erschienen: |
2024 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:294 |
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| Enthalten in: |
Journal of plant physiology - 294(2024) vom: 29. März, Seite 154192 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Andrzejowska, Aleksandra [VerfasserIn] |
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| Links: |
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| Themen: |
1406-65-1 |
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| Anmerkungen: |
Date Completed 11.03.2024 Date Revised 11.03.2024 published: Print-Electronic Citation Status MEDLINE |
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| doi: |
10.1016/j.jplph.2024.154192 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| 245 | 1 | 0 | |a Freezing temperature effects on photosystem II in Antarctic lichens evaluated by chlorophyll fluorescence |
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| 520 | |a Copyright © 2024 Elsevier GmbH. All rights reserved. | ||
| 520 | |a This study explores and compares the limits for photosynthesis in subzero temperatures of six Antarctic lichens: Sphaerophorus globosus, Caloplaca regalis, Umbilicaria antarctica, Pseudephebe minuscula, Parmelia saxatilis and Lecania brialmontii combining linear cooling and chlorophyll fluorescence methods. The results revealed triphasic S-curves in the temperature response of the maximum quantum yield (FV/FM) and effective quantum yield of photosystem II (ΦPSII) for all species. All investigated species showed a high level of cryoresistance with critical temperatures (Tc) below -20 °C. However, record low Tc temperatures have been discovered for L. brialmotii (-54 °C for FV/FM and -40 °C for ΦPSII) and C. regalis (-52 °C for FV/FM and -38 °C for ΦPSII). Additionally, the yield differentials (FV/FM - ΦPSII) in functions of temperature revealed one or two peaks, with the larger one occurring for temperatures below -20 °C for the above-mentioned species. Finally, Kautsky kinetics were measured and compared at different temperatures (20 °C, 10 °C, 0 °C and -10 °C and then -10 °C after 1 h of incubation). This research serves as a foundation for further developing investigations into the biophysical mechanisms by which photosynthesis is carried out at subzero temperatures | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Antarctic lichens | |
| 650 | 4 | |a Chlorophyll fluorescence | |
| 650 | 4 | |a Freezing tolerance | |
| 650 | 4 | |a Kautsky kinetic | |
| 650 | 4 | |a Linear cooling | |
| 650 | 4 | |a Photosynthesis | |
| 650 | 7 | |a Chlorophyll |2 NLM | |
| 650 | 7 | |a 1406-65-1 |2 NLM | |
| 650 | 7 | |a Photosystem II Protein Complex |2 NLM | |
| 700 | 1 | |a Hájek, Josef |e verfasserin |4 aut | |
| 700 | 1 | |a Puhovkin, Anton |e verfasserin |4 aut | |
| 700 | 1 | |a Harańczyk, Hubert |e verfasserin |4 aut | |
| 700 | 1 | |a Barták, Miloš |e verfasserin |4 aut | |
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