Wood properties of juvenile and mature heartwood in Robinia pseudoacacia L

• Published in: Wood science and technology Vol. 44; no. 2; pp. 301 - 313
• Main Authors: Dünisch, Oliver, Richter, Hans-Georg, Koch, Gerald
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Berlin/Heidelberg : Springer-Verlag 01.05.2010; Springer-Verlag; Springer Nature B.V
• Subjects: Acetone; Biomedical and Life Sciences; Blood vessels; Brown rot; Cell walls; Ceramics; Composites; Coniophora puteana; Coriolus versicolor; Flavonoids; Fungi; Glass; Heart rot; High performance liquid chromatography; Life Sciences; Liquid chromatography; Machines; Manufacturing; Natural Materials; Organic chemistry; Original; Parenchyma; Phenolic compounds; Phenols; Processes; Robinia pseudoacacia; Trees; White rot; Wood; Wood Science & Technology; Mature Wood; Tree Ring; Juvenile Wood; Robinia Pseudoacacia; Black Locust
• ISSN: 0043-7719; 1432-5225
• DOI: 10.1007/s00226-009-0275-0

The aim of this study is to characterise the properties of juvenile and mature heartwood of black locust (Robinia pseudoacacia L.). Content, composition and the subcellular distribution of heartwood extractives were studied in 14 old-growth trees from forest sites in Germany and Hungary as well as in 16 younger trees of four clone types. Heartwood extractives (methanol and acetone extraction) were analysed by HPLC-chromatography. UV microspectrophotometry was used to topochemically localise the extractives in the cell walls. The natural durability of the juvenile and mature heartwood was analysed according to the European standard EN 350-1. Growth as well as chemical analyses showed that, based on extractives content, the formation of juvenile wood in black locust is restricted to the first 10-20 years of cambial growth. In mature heartwood, high contents of phenolic compounds and flavonoids were present, localised in high concentrations in the cell walls and cell lumen of axial parenchyma and vessels. In juvenile wood, the content of these extractives is significantly lower. Juvenile wood had a correspondingly lower resistance to decay by Coniophora puteana (brown rot fungus) and Coriolus versicolor (white rot fungus) than mature heartwood.