Abstract
Photochemical efficiency of PSII of Ctenanthe setosa was investigated to understand the photosynthetic adaptation mechanism under drought stress causing leaf rolling. Stomatal conductance (g s), the levels of photosynthetic pigments and chlorophyll (Chl) fluorescence parameters were determined in leaves that had four different visual leaf rolling scores from 1 to 4, opened after re-watering and mechanically opened at score 4. g s value gradually decreased in adaxial and abaxial surfaces in relation to scores of leaf rolling. Pigment contents decreased until score 3 but approached score 1 level at score 4. No significant variations in effective quantum yield of PSII (ΦPSII), and photochemical quenching (qp) were found until score 3, while they significantly decreased at score 4. Non-photochemical quenching (NPQ) increased at score 2 but then decreased. After re-watering, the Chl fluorescence and other physiological parameters reached to approximately score 1 value, again. As for mechanically opened leaves, g s decreased during drought period. The decrease in adaxial surface was higher than that of the rolled leaves. NPQ was higher than that of the rolled leaves. ΦPSII and qp significantly declined and the decreases were more than those of the rolled leaves. In conclusion, the results indicate that leaf rolling protects PSII functionality from damage induced by drought stress.
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Abbreviations
- Chl:
-
chlorophyll
- ETR:
-
electron transport rate
- g s :
-
stomatal conductance
- Fv/Fm :
-
maximum quantum yield of PSII photochemistry
- Fm :
-
maximum Chl fluorescence yield in the dark-adapted state
- Fm′:
-
maximum Chl fluorescence yield in the lightadapted state
- F0 :
-
minimum Chl fluorescence yield in the dark-adapted state
- Fs :
-
steady-state Chl fluorescence yield in the light-adapted state
- FM:
-
fresh mass
- DM:
-
dry mass
- TM:
-
turgid mass
- NPQ:
-
non-photochemical quenching of Chl fluorescence
- qp :
-
photochemical quenching of Chl fluorescence
- Rfd:
-
vitality index
- RWC:
-
relative water content
- ΦPSII :
-
effective quantum yield of PSII photochemistry
- Ψleaf :
-
leaf water potential
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Acknowledgement: This work was supported by the Research Fund of Karadeniz Technical University (project number is 2006.111.004.2) and Hungarian National Science Foundation (project number is OTKA K63252). Authors thank to Dr. Győző Garab for his valuable suggestions and Dr. M. Naci Kayaoğlu for language control.
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Nar, H., Saglam, A., Terzi, R. et al. Leaf rolling and photosystem II efficiency in Ctenanthe setosa exposed to drought stress. Photosynthetica 47, 429–436 (2009). https://doi.org/10.1007/s11099-009-0066-8
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DOI: https://doi.org/10.1007/s11099-009-0066-8