Photosystem II heat tolerances characterize thermal generalists and the upper limit of carbon assimilation
| Autor: | Olga Tserej, Annika Socha, Kenneth J. Feeley, Timothy M. Perez |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
0301 basic medicine Thermotolerance Photosystem II Physiology Plant Science Generalist and specialist species Atmospheric sciences Photosynthesis 01 natural sciences 03 medical and health sciences Carbon assimilation Thermal Limit (mathematics) Phylogeny Plant Physiological Phenomena Photosystem II Protein Complex Electron transport chain Carbon 030104 developmental biology Plant species Florida Environmental science Gardens 010606 plant biology & botany |
| Zdroj: | Plant, cellenvironmentREFERENCES. 44(7) |
| ISSN: | 1365-3040 |
| Popis: | The heat tolerance of photosystem II (PSII) may promote carbon assimilation at higher temperatures and help explain plant responses to climate change. Higher PSII heat tolerance could lead to 1) increases in the high temperature compensation point (Tmax ); 2) increases in the thermal breadth of photosynthesis (i.e., the photosynthetic parameter Ω) to promote a thermal generalist strategy of carbon assimilation; 3) increases in the optimum rate of carbon assimilation Popt and faster carbon assimilation; and/or 4) increases in the optimum temperature for photosynthesis (Topt ). To address these hypotheses, we tested if the Tcrit , T50 and T95 PSII heat tolerances were correlated with carbon assimilation parameters for 21 plant species. Our results did not support Hypothesis 1, but we observed that T50 may be used to estimate the upper thermal limit for Tmax at the species-level, and that community mean Tcrit may be useful for approximating Tmax . The T50 and T95 heat tolerance metrics were positively correlated with Ω in support of Hypothesis 2. We found no support for Hypotheses 3 or 4. Our study shows that high PSII heat tolerance is unlikely to improve carbon assimilation at higher temperatures, but may characterize thermal generalists with slow resource acquisition strategies. This article is protected by copyright. All rights reserved. |
| Databáze: | OpenAIRE |
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