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OtherENVIRONMENTAL AND STRESS PHYSIOLOGY
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Growth at Low Temperature Mimics High-Light Acclimation in Chlorella vulgaris

D. P. Maxwell, S. Falk, C. G. Trick, NPA. Huner
D. P. Maxwell
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S. Falk
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C. G. Trick
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NPA. Huner
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Published June 1994. DOI: https://doi.org/10.1104/pp.105.2.535

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Abstract

Structural and functional alterations to the photosynthetic apparatus after growth at low temperature (5[deg]C) were investigated in the green alga Chlorella vulgaris Beijer. Cells grown at 5[deg]C had a 2-fold higher ratio of chlorophyll a/b, 5-fold lower chlorophyll content, and an increased xanthophyll content compared to cells grown at 27[deg]C even though growth irradiance was kept constant at 150 [mu]mol m-2 s-1. Concomitant with the increase in the chlorophyll a/b ratio was a lower abundance of light-harvesting polypeptides in 5[deg]C-grown cells as observed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and confirmed by western blotting.The differences in pigment composition were found to be alleviated within 12 h of transferring 5[deg]C-grown cells to 27[deg]C. Furthermore, exposure of 5[deg]C-grown cells to a 30-fold lower growth irradiance (5 [mu]mol m-2 s-1) resulted in pigment content and composition similar to that in cells grown at 27[deg]C and 150 [mu]mol m-2 s-1. Although both cell types exhibited similar measuring-temperature effects on CO2-saturated O2 evolution, 5[deg]C-grown cells exhibited light-saturated rates of O2 evolution that were 2.8-and 3.9-fold higher than 27[deg]C-grown cells measured at 27[deg]C and 5[deg]C, respectively. Steady-state chlorophyll a fluorescence indicated that the yield of photosystem II electron transport of 5[deg]C-grown cells was less temperature sensitive than that of 27[deg]C-grown cells. This appears to be due to an increased capacity to keep the primary, stable quinone electron acceptor of photosystem II (QA) oxidized at low temperature in 5[deg]C- compared with 27[deg]C-grown cells regardless of irradiance. We conclude that Chlorella acclimated to low temperature adjusts its photosynthetic apparatus in response to the excitation pressure on photosystem II and not to the absolute external irradiance. We suggest that the redox state of QA may act as a signal for this photosynthetic acclimation to low temperature in Chlorella.

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Growth at Low Temperature Mimics High-Light Acclimation in Chlorella vulgaris
D. P. Maxwell, S. Falk, C. G. Trick, NPA. Huner
Plant Physiology Jun 1994, 105 (2) 535-543; DOI: 10.1104/pp.105.2.535

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Growth at Low Temperature Mimics High-Light Acclimation in Chlorella vulgaris
D. P. Maxwell, S. Falk, C. G. Trick, NPA. Huner
Plant Physiology Jun 1994, 105 (2) 535-543; DOI: 10.1104/pp.105.2.535
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Plant Physiology
Vol. 105, Issue 2
Jun 1994
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