Abstract
In the bark of Populus tremula L. photochemical efficiency of photosystem 2 (PS2) determined as Fv/Fm decreased during winter. The strongest reduction was found after cold periods. The degree of reduction depended on irradiance since the lowest levels of Fv/Fm were found on the sun-exposed side of the stem and below thin phellem. Therefore, photoinhibition was partly responsible for the reduction in Fv/Fm. The photochemical efficiency of PS2 recovered in late April about a month before the trees got leaves. In the laboratory, Fv/Fm recovered within about a week under low irradiance at 20 °C. Rapid recovery of photochemical efficiency of PS2 in the bark may be important to reduce respiratory loss of CO2 from the stem before the trees get leaves.
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Solhaug, K., Haugen, J. Seasonal Variation of Photoinhibition of Photosynthesis in Bark from Populus Tremula L.. Photosynthetica 35, 411–417 (1998). https://doi.org/10.1023/A:1006968403331
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DOI: https://doi.org/10.1023/A:1006968403331