Distribution of Carbohydrates in Deformed Seedling Root Systems
Soluble 14C carbohydrate distribution in the phloem of deformed loblolly pine roots differed from those within straight roots. Analysis of three treatment root deformities, each using twelve 1-year transplants exposed to 14C for 24 hours showed that sugars accumulated above the first important impediment to normal translocation. This simulated a phloem girdle. Accumulated carbohydrates were apparently channeled into lateral roots which originated near the zone of accumulation. Root initiation stimuli, which other investigators have shown to be associated with carbohydrate movement, seemed to affect lateral rather than taproot meristems. The extensive, well-branched lateral root system which developed in the upper soil layers as a result of deformation may absorb water and nutrients better than a taproot. A well-branched root system could increase survival and early growth rates during the stage that competition from herbs and shrubs is acute; a deeper root system would be more advantageous during extended droughts. Forest Sci. 21:263-267.
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Document Type: Journal Article
Affiliations: Professor, Department of Forestry, University of Tennessee, Knoxville, TN 37901
Publication date: 1975-09-01
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- Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
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