Seasonal variation of photoinhibition of photosynthesis in bark from Populus tremula

In the bark of Populus tremula 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...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Photosynthetica 1998-06, Vol.35 (3)
Hauptverfasser: Solhaug, K.A, Haugen, J. (Agricultural Univ. of Norway, As (Norway). Dept. of Biology and Nature Conservation)
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:In the bark of Populus tremula 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 deg C. Rapid recovery of photochemical efticiency of PS2 in the bark may be important to reduce respiratory loss of CO2 from the stem before the trees get leaves.
ISSN:0300-3604
1573-9058