Abstract
During cold acclimation by higher plants, temperature perception via changes in redox state of Photosystem II (PSII) and subsequent acclimation of the photosynthetic apparatus to cold is very important for achieving freezing tolerance. These properties were studied in two groups (A and B) of the same backcross 3 (BC3) progeny derived from a triploid hybrid of Festuca pratensis (2×) × Lolium multiflorum (4×) backcrossed three times onto diploid L. multiflorum cultivars. Leaves of Group A plants formed at 20°C at medium-low light were unable to acclimate their photosynthetic apparatus to cold. Compared to Group B, the Group A plants were also more frost sensitive. This acclimation ability correlated with the freezing tolerance of the plants. However, leaves of the same Group A plants developed at 20°C, but under higher-light conditions had increased ability to acclimate their photosynthetic apparatus to cold. It was concluded that Group A plants may have impaired PSII temperature perception, and this then resulted in their poor capability to cold acclimate.
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Abbreviations
- ABS/CS:
-
Light energy absorbed by leaf cross-section
- ca:
-
Cold acclimated plants
- AREA:
-
Pool size of electron acceptors from PSII (proportional to the oxidized plastoquinone pool)
- car:
-
Carotenoids (pool)
- chl:
-
Chlorophyll
- DIo/CS:
-
Amount of energy dissipated in PSII reaction centres per cross-section of the leaf
- ETo/CS:
-
Quantum yield of photosynthetic electron transport chain after Q A per cross-section of the leaf
- F 0 :
-
Fluorescence of leaves in the dark when all PSII reaction centres are open
- \( {F}\ifmmode{'}\else$'$\fi_{{\text{0}}} \) :
-
Fluorescence in leaves previously exposed to light darkened just before measurement
- F m and \( {F}\ifmmode{'}\else$'$\fi_{{\text{m}}} \) :
-
Fluorescence when all PSII reaction centres are closed in dark- and light-exposed leaves, respectively
- F s :
-
Steady state fluorescence in light-exposed leaves
- F t :
-
Freezing tolerance
- F v and \( {F}\ifmmode{'}\else$'$\fi_{{\text{v}}} \) :
-
Variable fluorescence in dark- and light-adapted leaves, respectively (F v = F m − F 0, \( {F}\ifmmode{'}\else$'$\fi_{{\text{v}}} = {F}\ifmmode{'}\else$'$\fi_{{\text{m}}} - {F}\ifmmode{'}\else$'$\fi_{0} \))
- F v:F m :
-
Maximum quantum yield of PSII
- \( {F}\ifmmode{'}\else$'$\fi_{{\text{v}}} {\user2{:}}{F}\ifmmode{'}\else$'$\fi_{{\text{m}}} \) :
-
PSII antenna trapping efficiency
- fw:
-
Fresh weight
- na:
-
Non-acclimated plants
- PPFD:
-
Photosynthetic photon flux density
- PSII:
-
Photosystem II
- ϕPSII:
-
Current quantum yield of PSII
- NPQ:
-
Non-photochemical quenching of chlorophyll a fluorescence
- QA :
-
The first stable electron acceptor in PSII
- q P :
-
Photochemical quenching of chlorophyll a fluorescence
- RC/CSo and RC/CSm :
-
Numbers of active reaction centres in the state of fully oxidized and reduced PSII reaction centre, respectively
- TRo/CS:
-
Quantum yield of primary photochemistry (from reaction centre to Q A) per cross-section of the leaf
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Acknowledgment
This study was performed with the financial support of European Commission: SAGES project (QLK5-CT-2000-00764).
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Communicated by F. Dubert.
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Rapacz, M., Gąsior, D., Kościelniak, J. et al. The role of the photosynthetic apparatus in cold acclimation of Lolium multiflorum. Characteristics of novel genotypes low-sensitive to PSII over-reduction. Acta Physiol Plant 29, 309–316 (2007). https://doi.org/10.1007/s11738-007-0040-7
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DOI: https://doi.org/10.1007/s11738-007-0040-7