Auxin and the Root-Regenerating Potential in Ponderosa Pine Seedlings
The root-regenerating potential (RRP) and diffusible auxin obtained from the shoots of one-year-old Pinus ponderosa Laws. seedlings were measured. RRP was defined as the total increase in length of all roots that elongated 5 mm or more during 30 days in the greenhouse. The RRP was characterized by a minimum in early winter followed by a maximum in late winter. Application of indole-3-acetic acid (IAA) in lanolin to disbudded seedling tops caused a slight increase in growth of newly initiated roots but had no effect on the elongation of old root tips. The amount of diffusible auxin obtained from seedling tops was low in late fall but increased to a peak in March. The correlation of diffusible auxin with RRP was poor. Transport of IAA occurred in peaks along the seedling stem and taproot rather than in a smooth gradient between shoot apex and base. Auxin may have a function in the root but it seems to have little influence on the RRP in transplanted ponderosa pine seedlings.
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Document Type: Journal Article
Affiliations: Plant Physiologist at the Forest Research Laboratory, Oregon State University, Corvallis
Publication date: 1967-09-01
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