Water Conduction in Lateral Roots of Red Pine
Abstract:Laboratory studies on excised lateral root segments of red pine determined various water conduction parameters and pathway characteristics. Outflow rates responded linearly to tension gradients between 0.05 and 0.50 bar/meter. "Relative conductivity" values were generally higher than those previously found in roots and up to fifty times greater than comparable values for stems and branches. Conducting xylem cross section, as determined with acid fuchsin dye, was often less than gross xylem area. Flow rates per unit of conducting cross section increased with distance from the stem, corresponding to recognized anatomical changes. Experimentally determined outflow rates closely followed viscosity changes with temperature. Conduction pathways were strictly linear in contrast to the spiral pathways reported in pine stems. Natural injuries, as well as single and radially-opposed, multiple saw-cuts, decreased outflow volumes. The magnitude of decrease was related to location of pathway interruptions. Forest Sci. 21:53-60.
Document Type: Journal Article
Affiliations: Charles Lathrop Pack Professor of Forest Soils, Dep. Agronomy, Cornell University, Ithaca, N.Y. 14850
Publication date: March 1, 1975
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Ranking: 16 of 66 in forestry
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