Tamarack response to salinity: effects of sodium chloride on growth and ion, pigment, and soluble carbohydrate levels

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dc.contributor.authorRenault, S
dc.date.accessioned2007-10-10T18:47:44Z
dc.date.available2007-10-10T18:47:44Z
dc.date.issued2005-12-31
dc.description.abstractThe extraction of bitumen from oil sands can increase levels of sodium and chloride in boreal forest soils. A study was designed to test the effect of 30 and 60 mmol/L NaCl on 6-month-old tamarack (Larix laricina (Du Roi) K. Koch.) seedlings grown in aerated nutrient solutions. After 40 days of treatment in a growth chamber, 30 mmol/L NaCl caused injury to old needles and decreased shoot biomass, root potassium concentration, root soluble carbohydrate content, as well as chlorophyll a, chlorophyll b, and carotenoid levels in old needles. Sodium content of seedlings exposed to 30 mmol/L NaCl was higher in roots than in stems and new needles, while chloride content was higher in both old and new needles. Sodium and chloride concentrations were similar in new needles and in old needles. Seedlings exposed to 60 mmol/L NaCl showed injury in both old and new needles and lower root and shoot biomass, root magnesium and potassium concentrations, and both root and stem soluble carbohydrate levels. Furthermore chlorophyll a, chlorophyll b, and carotenoid levels were lower in all needles than in the control. Sodium and chloride contents of seedlings treated with 60 mmol/L NaCl were higher in old and new needles than in roots and stems. The results suggest that tamarack seedlings have a moderate tolerance to salinity, and when exposed to 30 mmol/L NaCl the seedlings could avoid injury by maintaining a relatively high K+/Na+ ratio in new needles and controlling Na+ transport to the shoots.en
dc.format.extent110372 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.citation0045-5067; CAN J FOREST RES, DEC 2005, vol. 35, no. 12, p.2806 to 2812.en
dc.identifier.doihttp://dx.doi.org/10.1139/x05-194
dc.identifier.urihttp://hdl.handle.net/1993/2936
dc.language.isoengen_US
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dc.rightsopen accessen_US
dc.statusPeer revieweden
dc.subjectSALT TOLERANCEen
dc.subjectTONOPLAST VESICLESen
dc.subjectPINUS-BANKSIANAen
dc.subjectNA+/H+ ANTIPORTERen
dc.subjectPICEA-GLAUCAen
dc.subjectSEEDLINGSen
dc.subjectSULFATEen
dc.subjectROOTSen
dc.subjectRICEen
dc.subjectSTRESSen
dc.titleTamarack response to salinity: effects of sodium chloride on growth and ion, pigment, and soluble carbohydrate levelsen
dc.typejournal articleen_US
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