You are here: Home
/ Publication Information
Title: Graft union formation in Douglas-fir.
Author: Copes, D.L.;
Source: American Journal of Botany. 56(3): 285-289
Publication Series: Scientific Journal (JRNL)
Description: Greenhouse-grown Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) graft unions were examined between 2 and 84 days after grafting. Room temperature was maintained at 60-70 F throughout the growing season. In most respects grafts of Douglas-fir followed development patterns previously reported for spruce and pine grafts, but specific differences were noted in contributing cell types, time of formation, and mode of healing. The time interval from first occurrence to occurrence in 80% of the grafts is as follows: contact layers, 2 days; callus bridges, 10-14 days; periderm, 10-17 days; cambia, 17-23 days. Callus bridges were generally of secondary phloem or cortex origin. Callus lignification began along cut edges of the union at 14 days and was completed across the entire length of the union by 17 days. Lignified tracheids were continuous across union zones at 35 days. When proper grafting techniques were used, all tissue systems necessary for a successful union were present 35 days after grafting. Poor grafting techniques at times retarded cambium formation for 3 months or more.
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
XML: View XML
Copes, D.L. 1969. Graft union formation in Douglas-fir. American Journal of Botany. 56(3): 285-289
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility