Over aparasitaire uitwassen aan houtige planten

Adventitious Root Primordia - The Cause of Abnormally Broad Xylem Rays in Hard- and Softwoods

“…3 (\), 1982 as in other cases there exist already preformed primordia in stems and branches of several tree species (Van der Lek, 1924;Haissig, 1974). Such preformed, latent root primordia (root germs) are known in Chamaecyparis, Taxus, Thuja, Acer, Betula, Citrus, Fagus, Fraxinus, Lonicera, Malus, Populus, Prunus, Ribes, Salix and Ulmus (Borthwick, 1905;Van der Lek, 1924;Swingle, 1927;Sandison, 1934;Carlson, 1938Carlson, , 1950Carpenter, 1961;Braun, 1963;Braun & Schlenker, 1964;Haissig, 1970;Smith & Wareing, 1972;Fink, 1980a, b). While most histological investigations on this topic were mainly concerned with the meristems themselves, some authors also point to a close relation between these primordia and abnormal xylem rays.…”