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Title: Bioassay of plant growth regulator activity on aquatic plants
Authors: Purdue University. Department of Botany and Plant Pathology.
Aquatic Plant Control Research Program (U.S.)
Lembi, Carole A.
Netherland, Michael D.
Keywords: Aquatic plants
Bensulfuron methyl
Biological assay
Eurasian watermilfoil
Plant growth regulator
Publisher: Environmental Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Description: Technical Report
Abstract: A laboratory bioassay system was developed to determine whether inhibitors of gibberellin synthesis could reduce plant height but maintain physiological competence in two weedy submersed aquatic plants, hydrilla (Hydrilla verticillata Royle) and Eurasian watermilfoil (Myriophyllum spicatum L.). The gibberellin synthesis inhibitors tested were uniconazol, flurprimidol, and paclobutrazol. Milfoil was more sensitive to the inhibitors than hydrilla. All three compounds were effective in reducing both main and lateral stem lengths in hydrilla, although the number of lateral stems was greatly increased over untreated controls. Hydrilla produced a stoloniferous growth habit, in contrast to milfoil in which the dominant growth form was a single reduced stem with numerous compressed buds. Photosynthesis, measured as oxygen evolution, was not significantly affected in either plant at dosages in which stem reduction was obtained. Hydrilla had to be in constant contact with the compound in order to be affected, whereas milfoil required only 1 day of exposure to produce long-term effects. The bioassay suggests that these gibberellin synthesis inhibitors would have minimal adverse impacts on plant health but would be effective at reducing plant height in aquatic systems.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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