z-logo
Premium
Increased susceptibility to photoinhibition in pre‐existing needles experiencing low temperature at spring budbreak in Sakhalin spruce ( Picea glehnii ) seedlings
Author(s) -
Kitao Mitsutoshi,
Qu Laiye,
Koike Takayoshi,
Tobita Hiroyuki,
Maruyama Yutaka
Publication year - 2004
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.2004.00393.x
Subject(s) - photoinhibition , photosynthesis , chlorophyll fluorescence , chemistry , botany , horticulture , photosystem ii , shoot , biology
The seasonal changes in photosynthetic properties in 1‐year‐old needles of Sakhalin spruce ( Picea glehnii ) were measured using the chlorophyll fluorescence technique at various temperatures (5, 10, 20, 25 and 30°C). In the course of seasonal change, a temporary decrease in the quantum yield of PSII electron transport (Φ PSII ) was observed just before budbreak. A decline in photochemical quenching ( q P ) was observed at the same time as that of Φ PSII but only at the two lowest temperatures (5 and 10°C). Photochemical efficiency of open PSII ( F v ′/ F m ′) also declined just before budbreak at 25 and 30°C. An increase in thermal energy dissipation as indicated by a decrease in F v ′/ F m ′ before budbreak was not significant at lower temperatures (5 and 10°C) in spite of the declines in q P . This implies that thermal energy dissipation necessitated by the decline in Φ PSII might not be sufficiently strong to prevent a decline in q P at lower temperatures. On the other hand, at higher temperatures no decline was observed in q P because Φ PSII decreased to a relatively small extent, therefore thermal energy dissipation is sufficient in coping with the excessive energy accumulation in PSII. Seedlings of Sakhalin spruce exposed to ambient air temperature below 10°C before budbreak exhibited photoinhibition indicated by a decrease in the maximal photochemical efficiency of PSII ( F v / F m ) after an overnight dark adaptation. The present study suggests that 1‐year‐old shoots of Sakhalin spruce have an increased susceptibility to photoinhibition at low temperature just before budbreak.

This content is not available in your region!

Continue researching here.

Having issues? You can contact us here