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Growth of Fomes annosus in Roots of Suppressed and Dominant Loblolly Pines

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In autumn and winter field experiments the lateral roots of 100 dominant and suppressed Pinus taeda L. were inoculated with Fomes annosus (Fr.) Karst. Lateral extension of the fungus was more rapid in the roots of suppressed trees than in the roots of dominant ones during periods ranging from 5 to 8 weeks. In laboratory tests, the growth of F. annosus in root segments removed from dominant and suppressed trees was as great or greater after 14 days than in the inoculated living roots after 35 to 56 days. Growth rate of F. annosus in detached root segments from dominant trees was essentially similar to that in detached root segments of suppressed trees. The average percent reserve carbohydrates in lateral roots of dominant trees was generally higher than in roots of suppressed ones. Diameter growth for the past 5 years, significantly greater in dominant than in suppressed trees, was directly correlated with root reserve carbohydrates. Mycelial growth of F. annosus in inoculated living roots and in root segments was inversely related to root reserve carbohydrates. The percent reserve carbohydrates in different roots of indiviual loblolly pines in dense stands varied considerably, but little variation was found in different roots of isolated pines. No difference was found between nitrogen content of roots from dominant and suppressed trees; however, the average carbohydrate/nitrogen ratio was significantly higher in the roots of dominant than in roots of suppressed trees.
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Document Type: Journal Article

Affiliations: Professor of Plant Pathology, University of Wisconsin, Madison

Publication date: 1966-06-01

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