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Role of aquaporins in root water transport of ectomycorrhizal jack pine ( Pinus banksiana ) seedlings exposed to NaCl and fluoride
Author(s) -
LEE SEONG HEE,
CALVOPOLANCO MÓNICA,
CHUNG GAP CHAE,
ZWIAZEK JANUSZ J.
Publication year - 2010
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/j.1365-3040.2009.02103.x
Subject(s) - water transport , pinus <genus> , chemistry , botany , aquaporin , salinity , horticulture , salt (chemistry) , ectomycorrhiza , biology , water flow , biochemistry , mycorrhiza , environmental engineering , symbiosis , ecology , genetics , bacteria , engineering
Effects of ectomycorrhizal (ECM) fungus Suillus tomentosus on water transport properties were studied in jack pine ( Pinus banksiana ) seedlings. The hydraulic conductivity of root cortical cells ( L pc ) and of the whole root system ( L pr ) in ECM plants was higher by twofold to fourfold compared with the non‐ECM seedlings. HgCl 2 had a greater inhibitory effect on L pc in ECM compared with non‐ECM seedlings, suggesting that the mercury‐sensitive, aquaporin (AQP)‐mediated water transport was largely responsible for the differences in L pc between the two groups of plants. L pc was rapidly and drastically reduced by the 50 m m NaCl treatment. However, in ECM plants, the initial decline in L pc was followed by a quick recovery to the pre‐treatment level, while the reduction of L pc in non‐ECM seedlings progressed over time. Treatments with fluoride reduced L pc by about twofold in non‐ECM seedlings and caused smaller reductions of L pc in ECM plants. When either 2 m m KF or 2 m m NaF were added to the 50 m m NaCl treatment solution, the inhibitory effect of NaCl on L pc was rapidly reversed in both groups of plants. The results suggest that AQP‐mediated water transport may be linked to the enhancement of salt stress resistance reported for ECM plants.