Control of root morphogenesis for improved mechanical stability in container-grown lodgepole pine

Abstract

Lodgepole pine (Pinuscontorta Dougl.) seedlings were raised in containers (Styroblocks) painted with a root-growth inhibitor (exterior latex paint containing 0.1 kg/ℓ basic cupric carbonate). Contact with this wall coating completely inhibited the elongation of lateral roots, thereby preventing them from growing down or around the container wall. However, when the seedlings were planted, the inhibited lateral roots very quickly resumed growth. Consequently, the trees soon acquired a root system quite similar in basic form to that of a naturally established seedling.