Effects of Drought Stress Induced by Polyethylene Glycol on Pigment Content and Photosynthetic Gas Exchange of Pistacia Khinjuk and P. Mutica |
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| Authors: | A. Ranjbarfordoei R. Samson P. Van Damme R. Lemeur |
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| Affiliation: | (1) Department of Plant Production, Laboratory of Tropical and Subtropical Agronomy and Ethnobotany, Belgium;(2) Department of Applied Ecology and Environmental Biology, Laboratory of Plant Ecology, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium;(3) Department of Plant Production, Laboratory of Tropical and Subtropical Agronomy and Ethnobotany, Belgium |
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| Abstract: | The effects of drought stress induced by polyethylene glycol, PEG (molecular mass 6000) on some ecophysiological characteristics of two wild pistachio species, Mastic and Khinjuk (P. mutica and P. khinjuk) selected as root stocks for production of edible pistachio trees (P. vera) in Iran and Turkey, were studied. Net photosynthetic rate (P N), stomatal conductance (g s), chlorophyll (Chl) fluorescence parameters, leaf water potential (Ψ1), leaf osmotic potential (Ψπ), leaf osmotic adjustment (ΔΨπ), and Chl a and b were measured. All parameters were influenced by increase in concentra-tion of PEG in the nutrient solutions. P N, g s, and Chl a were significantly higher in P. mutica than in P. khinjuk but, compared to the control treatment, P. khinjuk showed a higher resistance to drought stress than P. mutica. This revised version was published online in August 2006 with corrections to the Cover Date. |
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| Keywords: | chlorophyll content net photosynthetic rate osmotic adjustment stomatal conductance water use efficiency |
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