When this work was completed, the senior author was working at the USDA Forest Service, Northeastern Forest Experiment Station, Forestry Sciences Laboratory in Durham NH 03824, USA, on a C.S.I.R.O. (Australia) postdoctoral fellowship.
Barriers to decay in conifer roots
Article first published online: 7 JUN 2007
European Journal of Forest Pathology
Volume 11, Issue 1-2, pages 51–59, February 1981
How to Cite
Tippett, J. T. and Shigo, A. L. (1981), Barriers to decay in conifer roots. European Journal of Forest Pathology, 11: 51–59. doi: 10.1111/j.1439-0329.1981.tb00070.x
- Issue published online: 7 JUN 2007
- Article first published online: 7 JUN 2007
The process of compartmentalization, including the formation of barrier zones, localized discolored and decayed wood in roots of balsam fir, red spruce, eastern hemlock, white pine, and tamarack. The decay was caused by Armillaria mellea (Vahl. ex Fr.) Quel. and unidentified hymenomycetes. The most effective “walls” to decay were composed of resin ducts and parenchyma cells. Cylindrical patterns of decay formed due to tangential bands of resin ducts and parenchyma. In response to injury, conifer roots increase production of parenchyma cells which accumulate polyhenols. Three types of parenchyma may be produced: that associated with resin ducts, xylem rays, and tangential rings of cells resembling marginal parenchyma.