Laboratory Evaluation of Mefluidide Effects on Elongation of Hydrilla and Eurasian Watermilfoil

Liu, Xiao-Xi and Lembi, Carole A. (1999) Laboratory Evaluation of Mefluidide Effects on Elongation of Hydrilla and Eurasian Watermilfoil. Journal of Aquatic Plant Management, 37, pp. 55-60.

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Abstract

The potential of mefluidide (N-(2,4-dimethyl-5[[trifluromethyl) sulfonyl] amino] phenol) acetamide) to act as a submersed aquatic plant growth regulator was evaluated using a laboratory bioassay system. Main stem elongation of hydrilla (Hydrilla verticillata (L.f.) Royle) and Eurasian watermilfoil (Myriophyllum spicatum L.) was effectively reduced by mefluidide at low concentrations. The lowest effective concentration of mefluidide that reduced stem length in Eurasian watermilfoil (100 yg a.i./L) was 5 times lower than that for hydrilla (500 yg a.i./L). Short-term net photosynthetic rates of these plants were not affected by mefluidide at concentrations as high as 1000 yg a.i./L. The minimum exposure time required to maintain an inhibitory effect for at least 28 days at a concentration of 500 yg ai.i./L was 3 to 7 days for Eurasian watermilfoil and 7 to 14 days for hydrilla. The results suggest that mefluidide is a more effective growth regulator for Eurasian watermilfoil than hydrilla. Exogenously applied gibberellic acid (GA) did not completely overcome the inhibitory effect of mefluidide even when GA was added at a high concentration (10-5 M). In addition, the internodal lengths of stems treated with mefluidide were not reduced as they were when treated with gibberellin synthesis inhibitors. The reduction of main stem elongation by mefluidide appeared to be due to the inhibition of new cell and tissue development at the stem tip rather than from inhibition of GA biosynthesis.

Item Type: Article
Title: Laboratory Evaluation of Mefluidide Effects on Elongation of Hydrilla and Eurasian Watermilfoil
Personal Creator/Author:
CreatorsEmail
Liu, Xiao-Xi
Lembi, Carole A.
Refereed: Yes
Journal or Publication Title: Journal of Aquatic Plant Management
Volume: 37
Page Range: pp. 55-60
Date: 1999
Issuing Agency: Aquatic Plant Management Society, Inc.
Uncontrolled Keywords: aquatic plants; dose response; gibberellic acid; photosynthetic response; plant growth regulator; Eurasian watermilfoil; Myriophyllum spicatum; hydrilla; Hydrilla verticillata; plant growth regulator
Subjects: Conservation
Biology
Item ID: 1762
Depositing User: Natalie Wiest
Date Deposited: 24 Nov 2008 21:52
Last Modified: 29 Sep 2011 20:04
URI: http://aquaticcommons.org/id/eprint/1762

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