註釋 Inoculation of seedlings with mycorrhizae is a means of improving stress resistance of planting stock on reforestation sites low in natural fungi. The value of mycorrhizal inoculation can be tested in the field, but measurements typically require at least one growing season. This report describes a study to determine if a stress test used in a greenhouse setting could be indicative of the benefits of mycorrhizal inoculation for outplanting performance. The test developed was based on drought resistance. Chlorophyll fluorescence measurements were used to quantify seedling response to drought stress. Inoculated and control groups of jack pine, black spruce, and white spruce were subjected to the drought stress test and fluorescence measurements made. Samples of inoculated and control seedlings were planted, and survival and growth were monitored to determine whether stress resistance test results prior to planting accurately predicted field performance. 