Eacute;tude de la reacute;activation cambiale chez un arbre ayant un bois agrave; zones poreuses (Castanea sativa) et deux autres au bois agrave; pores diffus (Betula verrucosa,Acer campestre)

摘要

Cambial reactivation and xylogenesis have been studied in diffuse porous (Betula verrucosaEhr.,Acer campestreL.) and ring porous (Castanea sativaMill.) trees more than 25 years old. Our results show that the basipetal and overall cambial reactivations coexist in the two groups of trees, in contrast to what is generally admitted. The basipetal cambial reactivation occurs in the terminal parts of the branches and is controlled by the buds. The overall cambial reactivation affects the trunk and the older parts of the branches; it shows a certain autonomy from the phenomena occurring within the upper part of the tree.