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TI: Water relations of ectomycorrhizas of Lodgepole Pine.
AU: Mexal-JG
SO: Dissertation-Abstracts-International,-B. 1975, 36: 1, 113; Order No. 75-14, 668. ORS.
LA: English
AB: The effect of artificially induced water stress on physiological processes was studied with polyethylene glycol 400 as the osmotic agent. Four species of mycorrhizal fungi were grown in culture at different water potentials (W). The values of W at which optimum growth occurred ranged from 0 to -15 bars. Seed germination of Pinus contorta was not influenced when W was no lower than -8 bars, but seedling weight and length at 30 days were reduced when W was lower than -2 bars. Seedling growth at W ranging from 0 to -6 bars was not inhibited after 2.5 weeks of water stress, but growth was inhibited after 11 weeks of stress. After water stress for 30 weeks, growth was seriously affected by reduced W and species of fungus used as mycorrhizal inoculum. Mycorrhizae did not form at -4 and -6 bars. Roots of 7-year-old P. contorta exuded more material at a stress of -4 bars than at stresses of 0 or -2 bars. Exudation of material did not differ between mycorrhizal and non-mycorrhizal roots.
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