Field assessment of Douglas-fir somatic and zygotic seedlings with respect to gas exchange, water relations, and frost hardiness .

Presents a study of Douglas-fir (Pseudotsuga menziesii var. menziesii (Mirb.) Franco) zygotic seedlings and seedlings produced through somatic embryogenesis on southern Vancouver Island, British Columbia. Comparison of the two stock types in a number of adaptive attributes evaluated during two growing seasons; Methods; Findings; Indication that somatic and zygotic seedlings had a similar pattern of physiological performance throughout two years of assessment.