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Trees

, Volume 6, Issue 3, pp 147–155 | Cite as

Food reserves of scots pine (Pinus sylvestris L.)

II. Seasonal changes and radial distribution of carbohydrate and fat reserves in pine wood
  • Christine Fischer
  • Wolfgang Höll
Original Articles

Summary

Starch, soluble sugars, triacylglycerols, diacylglycerols and free fatty acids were measured in 30-year-old Scots pine (Pinus sylvestris L.) trees during an annual cycle in the sapwood (youngest ten xylem rings). The radial distribution of carbohydrates and lipids was studied in the trunkwood of 90 -to 150-year-old Scots pine trees collected at the end of the growing season. Determination of the compounds was performed using specific enzymatic assays, capillary gas chromatography and thin layer chromatography. The amounts of glucose, fructose, sucrose, and galactose/arabinose in the sapwood were slightly higher in winter than in summer. Raffinose/stachyose increased up to 5-fold during the cold period. At the beginning of the growing season starch amounts rose, and then decreased in summer and autumn. No concentration changes were observed in the total amounts of diacylglycerols and fatty acids throughout the year. Triacylglycerol levels were slightly higher in February than in summer and autumn. Relative frequencies of individual fatty acids were similar in all lipid fractions. Glucose, fructose, sucrose, starch and triacylglycerols disappeared almost entirely at the transition zone from sapwood to heartwood. In contrast, free fatty acids and galactose/arabinose rose in centripetal direction, and diacylglycerols remained constant across trunk cross-sections. The relative amounts of individual fatty acids changed markedly in the free fatty acid fraction and in the triacylglycerols when crossing the sapwood-heartwood boundary. Concentration changes of reserve materials are discussed in relation to season, mobilization and translocation processes, dormancy, frost resistance, and heartwood formation. The results are compared to those found in needles.

Key words

Pinus sylvestris Starch Sugars Triacylglycerols Xylem 

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Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • Christine Fischer
    • 1
  • Wolfgang Höll
    • 1
  1. 1.Institut für Botanik und MikrobiologieTechnische Universität MünchenMunich 2Germany

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