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Root Exudates of Seedling and Mature Sugar Maple. William H. Smith, Assistant Professor of Forest Pathology, School of Forestry, Yale University, New Haven, Connecticut 06511. Phytopathology 60:701-703. Accepted for publication 17 November 1969. DOI: 10.1094/Phyto-60-701.

Root exudates from 3-week-old sugar maple seedlings and a 55-year-old mature tree were analyzed for carbohydrates, amino acids/amides, and organic acids. Carbohydrates from seedlings were more diverse and abundant than those from mature trees. Amino acids/amides and organic acids were released in greatest diversity and abundance from unsuberized tips of mature tree roots.