ORCID Profile
0000-0002-8209-0294
Current Organisation
University of Technology Sydney
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Publisher: Elsevier BV
Date: 05-2022
Publisher: Frontiers Media SA
Date: 17-03-2020
Publisher: No publisher found
Date: 2020
DOI: 10.3390/RS12091470
Publisher: Frontiers Media SA
Date: 29-11-2019
Publisher: Elsevier BV
Date: 2021
Publisher: Elsevier BV
Date: 08-2019
Publisher: Springer Science and Business Media LLC
Date: 22-11-2022
DOI: 10.1007/S11120-022-00981-0
Abstract: Light intensity and temperature independently impact all parts of the photosynthetic machinery in plants and algae. Yet to date, the vast majority of pulse litude modulated (PAM) chlorophyll a fluorescence measurements have been performed at well-defined light intensities, but rarely at well-defined temperatures. In this work, we show that PAM measurements performed at various temperatures produce vastly different results in the chlorophyte Chlorella vulgaris. Using a recently developed Phenoplate technique to map quantum yield of Photosystem II (Y(II)) and non-photochemical quenching (NPQ) as a function of temperature, we show that the fast-relaxing NPQ follows an inverse normal distribution with respect to temperature and appears insensitive to previous temperature acclimation. The slow-relaxing or residual NPQ after 5 minutes of dark recovery follows a normal distribution similar to Y(II) but with a peak in the higher temperature range. Surprisingly, higher slow- and fast-relaxing NPQ values were observed in high-light relative to low-light acclimated cultures. Y(II) values peaked at the adaptation temperature regardless of temperature or light acclimation. Our novel findings show the complete temperature working spectrum of Y(II) and how excess energy quenching is managed across a wide range of temperatures in the model microalgal species C. vulgaris. Finally, we draw attention to the fact that the effect of the temperature component in PAM measurements has been wildly underestimated, and results from experiments at room temperature can be misleading.
Publisher: Elsevier BV
Date: 03-2022
Location: United States of America
No related grants have been discovered for Christopher Hall.