Photosynthetica 2009, 47(3):429-436 | DOI: 10.1007/s11099-009-0066-8

Leaf rolling and photosystem II efficiency in Ctenanthe setosa exposed to drought stress

H. Nar1, A. Saglam1, R. Terzi1,*, Z. Várkonyi2, A. Kadioglu1
1 Department of Biology, Faculty of Art and Science, Karadeniz Technical University, Trabzon, Turkey
2 Institute of Plant Biology, Biological Research Center, Hungarian Academy of Sciences, Szeged, Hungary

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.

Additional key words: chlorophyll fluorescence; Ctenanthe setosa; drought; leaf rolling; protection; PSII functionality

Received: May 7, 2009; Accepted: August 27, 2009; Published: September 1, 2009  Show citation

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Nar, H., Saglam, A., Terzi, R., Várkonyi, Z., & Kadioglu, A. (2009). Leaf rolling and photosystem II efficiency in Ctenanthe setosa exposed to drought stress. Photosynthetica, 47(3), 429-436. doi: 10.1007/s11099-009-0066-8
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