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U.S. Department of Agriculture USDA Forest Service Southern Regional Extension Forestry Southern Regional Extension Forestry

Enhancement of Shoot Organogenesis in Conifers

Shoot production can be enhanced by providing more optimal hormone conditions in the shoot induction medium. Abscisic acid (ABA), in addition to auxins and cytokinins, enhances shoot formation from conifer explants. ABA, enhances the morphogenic area of cotyledon explants from two Pinus species. The degree of enhancement is related to the seed source and the length of exposure. Shoot production is completely blocked by fluridone (FLUR), an inhilitor of endogenous ABA synthesis. Abscisic acid appears to be an important hormone in shoot morphogenesis.

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Author(s): Ronald J. Newton, S. Sen, F. Fong, P. Neuman

Publication: Tree Improvement and Genetics - Southern Forest Tree Improvement Conference - 1989

Section: Concurrent Session 1A