Seasonal Variation of Photoinhibition of Photosynthesis in Bark from Populus Tremula L. |
| |
Authors: | Solhaug KA Haugen J |
| |
Institution: | (1) Department of Biology and Nature Conservation, Agricultural University of Norway, P.O. Box 5014, N-1432 Ås, Norway |
| |
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. |
| |
Keywords: | chlorophyll fluorescence induction irradiance oxygen evolution phellem photosystem 2 poplar quantum yield seasonal course tree age |
本文献已被 SpringerLink 等数据库收录! |