Paraquat And Cepa Stimulation Of Oleoresin Production in Lodgepole Pine Central Stump-root System
Keywords:Turpentine, rosin acids, resin acids, fatty acids, ethylene
Lodgepole pines (Pinus contorta Dougl.) between 11.4 and 14.0 cm DBH at 2 locations in western Montana were treated with paraquat or 2-chloroethylphosphonic acid (CEPA) to induce oleoresin soaking. Chemicals were applied by pouring into a hole drilled in the stump/taproot or by pouring a CEPA solution on the soil around the trees. After 15 months, the trees were harvested, divided into two root and four stem sections up to 1.4m above ground, and analyzed for density (g/cc) and for rosin acids, turpentine, and moisture content. No differences in density were found due to CEPA and paraquat treatments.
The proportions of rosin acid and turpentine in the wood were always greater in roots than in stems of control trees. Paraquat treatment caused increases in oleoresin in all but the lower root section. Paraquat treatment increased rosin acid content by 70% and turpentine content by 64% on a moisture free basis in the first 30-cm stem section.
When CEPA was poured on the ground, the maximum rosin acid and turpentine increases, of 88 and 43% respectively, were found in the top three stem sections, but rosin acid and turpentine contents decreased by up to 38 and 42% respectively, in the lowest root section. When CEPA was introduced directly into the tree, it was apparently transported bidirectionally causing increases in oleoresin in the lowest root section and upper stem sections but decreases in the center sections (first root and stem sections).
Operationally, stump (stem up to 1.4 m)/root treatments with paraquat will increase oleoresin in both the root and stem. CEPA treatment by pouring CEPA on the ground would be the simplest treatment, but oleoresin would increase only in the stem. CEPA introduced by bore hole treatment would result in no net increase in oleoresin in the stem alone, root alone or stem plus root combined.
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