Effects of NaCl on responses of ectomycorrhizal black spruce (<i>Picea mariana</i>), white spruce (<i>Picea glauca</i>) and jack pine (<i>Pinus banksiana</i>) to fluoride

Physiologia Plantarum - Tập 135 Số 1 - Trang 51-61 - 2009
Mónica Calvo‐Polanco1, Janusz J. Zwiazek2, Melanie D. Jones2, Michael D. MacKinnon3
1Department of Renewable Resources, University of Alberta, 442 Earth Sciences Bldg., Edmonton, Alberta T6G 2E3, Canada
2Biology Program, Biology and Physical Geography Unit, UBC Okanagan, 3333 University Way, Kelowna, British Columbia V1V 1V7, Canada
3Syncrude Canada Ltd., Edmonton Research Centre, 9421-17 Avenue, Edmonton, Alberta T6N 1H4, Canada

Tóm tắt

Black spruce (Picea mariana), white spruce (Picea glauca) and jack pine (Pinus banksiana) were inoculated with Suillus tomentosus and subjected to potassium fluoride (1 mM KF and 5 mM KF) in the presence and absence of 60 mM NaCl. The NaCl and KF treatments reduced total dry weights in jack pine and black spruce seedlings, but they did not affect total dry weights in white spruce seedlings. The addition of 60 mM NaCl to KF treatment solutions alleviated fluoride‐induced needle injury in ectomycorrhizal (ECM) black spruce and white spruce, but had little effect in jack pine seedlings. Both KF and 60 mM NaCl treatments reduced E values compared with non‐treated control seedlings. However, with the exception of small reductions of Kr by NaCl treatments in black spruce, the applied KF and NaCl treatments had little effect on Kr in ECM plants. Chloride tissue concentrations in NaCl‐treated plants were not affected by the presence of KF in treatment solutions. However, shoot F concentrations in ECM black spruce and white spruce treated with 5 mM KF + 60 mM NaCl were significantly reduced compared with the 5 mM KF treatment. The results point to a possible competitive inhibition of F transport by Cl. We also suggest that the possibility that aquaporins may be involved in the transmembrane transport of F should be further investigated.

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Physiologia Plantarum

Tập 135 Số 1

51-61

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