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Auxin and the Root-Regenerating Potential in Ponderosa Pine Seedlings

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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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  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
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