Effects of NaCl and Na2SO4 on red-osier dogwood (Cornus stolonifera Michx) seedlings |
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Authors: | Renault Sylvie Croser Clare Franklin Jennifer A. Zwiazek Janusz J. |
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Affiliation: | (1) Department of Botany, University of Manitoba, 505 Buller Building, Winnipeg, MB, Canada, R3T 2N2;(2) Department of Renewable Resources, University of Alberta, 4-42 Earth Sciences Bldg, Edmonton, AB, Canada, T6G 2E3 |
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Abstract: | Sodium chloride and sodium sulfate are commonly present in extraction tailings waters produced as a result of surface mining and affect plants on reclaimed areas. Red-osier dogwood (Cornus stolonifera Michx) seedlings were demonstrated to be relatively resistant to these high salinity oil sands tailings waters. The objectives of this study were to compare the effects of Na2SO4 and NaCl, on growth, tissue ion content, water relations and gas exchange in red-osier dogwood (Cornus stolonifera Michx) seedlings. In the present study, red-osier dogwood seedlings were grown in aerated half-strength modified Hoagland's mineral solution containing 0, 25, 50 or 100 mM of NaCl or Na2SO4. After four weeks of treatment, plant dry weights decreased and the amount of Na+ in plant tissues increased with increasing salt concentration. Na+ tissue content was higher in plants treated with NaCl than Na2SO4 and it was greater in roots than shoots. However, Cl– concentration in the NaCl treated plants was higher in shoots than in roots. The decrease in stomatal conductance and photosynthetic rates observed in presence of salts is likely to contribute to the growth reduction. Our results suggest that red-osier dogwood is able to control the transport of Na+ from roots to shoots when external concentrations are 50 mM or less. |
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Keywords: | Cornus stolonifera gas exchange growth ions salinity salt resistance |
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