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Notes: Drought Ring Formation in Conifers

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Potted 2-year-old white spruce and red pine seedlings were subjected, during their third growing season, to four different soil moisture tensions: control, 1, 6, and 15 atmospheres. Drought rings were only found in the white spruce subjected to the 15-atmospheres tension. They consisted of a band of tracheids which had reduced radial diameters, some with concaved tangential walls. The features of the drought rings varied, depending on their locations in the seedlings. The tracheid wall distortion was greatest near the apical meristem. Forest Sci. 16: 246-248.

Keywords: Picea glauca; Pinus resinosa; soil moisture tension

Document Type: News

Affiliations: Research Branch, Ontario Dep. of Lands and Forests, Maple

Publication date: June 1, 1970

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