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Notes: Shortening the Grass Stage of Longleaf Pine with Plant Growth Regulators

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6N-benzyladenine (BA) and gibberellic acid (GA3), alone and especially in combination, stimulated the height growth of naturally regenerated and 1-year-old plantation grassstage longleaf pine (Pinus palustris Mill.) seedlings. BA was more effective than GA3, and the addition of potassium nitrate, thiourea, and zinc sulfate enhanced the effect of BA more than that of GA3. Seventy-five to 95 percent of the naturally regenerated BA + GA3 treated seedlings elongated more than 7.5 cm during the growing season in which they were treated. High levels of salts and growth substances killed many meristems, but frequently these plants developed strong lateral buds and shoots. Treatments that induced two or three growth flushes resulted in plants with larger buds in the fall. At the higher concentrations, either GA3 or BA induced a proliferation of primary needles at the base of the seedlings. Forest Sci. 27:400-404.

Keywords: N-benzyladenine; Pinus palustris; gibberellic acid; growth regulators; height growth; short shoots

Document Type: Miscellaneous

Affiliations: Research Plant Geneticist, USDA Forest Service, Southeastern Forest Experiment Station, Olustee, FL 32072

Publication date: June 1, 1981

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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.
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