Photosynthetica 1998, 35(3):411-417 | DOI: 10.1023/A:1006968403331

Seasonal Variation of Photoinhibition of Photosynthesis in Bark from Populus Tremula L.

K.A. Solhaug1, J. Haugen1
1 Department of Biology and Nature Conservation, Agricultural University of Norway, Ås, Norway

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.

Additional key words: chlorophyll fluorescence induction; irradiance; oxygen evolution; phellem; photosystem 2; poplar; quantum yield; seasonal course; tree age

Prepublished online: September 1, 1998; Published: January 1, 1998  Show citation

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Solhaug, K.A., & Haugen, J. (1998). Seasonal Variation of Photoinhibition of Photosynthesis in Bark from Populus Tremula L. Photosynthetica, 35(3), 411-417. doi: 10.1023/A:1006968403331
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