Response of the Cambial Zone in Conifers to Wounding : 2nd Slovenian Symposium on Plant Physiology with international Participation, Gozd Martuljek. Slovenia, September, 30 to Oktober 2nd, 1998

1999

S. 133-137

1 Tab, 13 Lit.

Unselbständiges Werk

200059329

The sequence and character of histological changes in response of the cambial zone in Abies alba, Picea abies, Pinus sylvestris and Larix decidua to wounding were studied. Trees were wounded by removing square of bark from the wood on 7 April 1993 and response investigated 7, 14, 21, 28, 35, 42, 49, 56, 84, 112, and 140 days later. The sequence of changes was the same in all species. Callus developed at the wound edge by hypertrophy and hyperplasia of cells of the cambial zone. More tangential, increased frequency of transverse divisions was observed in fusiform cells of the cambial zone. On the surface of the callus a ligno-suberised layer formed. Internal to it new periderm developed only at the exposed part of the callus. A ligno-suberised layer represents durable protection at the ventral part of the callus, where new periderm did not form. A new cambium differentiated within the callus, giving rise to wound wood and bark. Tangential from the callus, a layer of lignified parenchyma cells formed at first, followed by a layer of short tracheids and a series of traumatic resin canals. The layer of lignified parenchyma cells and traumatic resin canals corresponded to the wall 4 of the CODIT concept. There existed little variation in timing of response between investigated species. Protective function of histological changes is discussed.