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Appl Environ Microbiol. 1992 October; 58(10): 3374-3379
Copyright © 1992, American Society for Microbiology. All Rights Reserved.

Enumeration and Characterization of Bacterial Colonists of a Submersed Aquatic Plant, Eurasian Watermilfoil (Myriophyllum spicatum L.)

T. Chand^,*, R. F. Harris and J. H. Andrews

¹ Department of Soil Science and Department of Plant Pathology, ² University of Wisconsin-Madison, Madison, Wisconsin 53706

ABSTRACT

A simple procedure for enumerating and grouping the bacterial colonists of Eurasian watermilfoil (Myriophyllum spicatum L.) is described. Colony characteristics of bacteria associated with M. spicatum were better defined and more stable on nutrient-poor, diluted nutrient broth agar than on high-nutrient media. Acinetobacter, Cytophaga, Flavobacterium, Moraxella, Pseudomonas and/or Alcaligenes, and Vibrio/Aeromonas spp., as well as two highly fastidious unidentified bacterial groups (gram-negative rods and gram-negative cocci), were associated with cultured watermilfoil during January, February, May, June, July, and August 1988. In Lake Wingra (Madison, Wis.), Micrococcus spp. and enterobacters were also associated with Eurasian watermilfoil during July, August, and October 1987.

^* Corresponding author.

Present address: ARS-USDA, 45 Wiltshire Road, Kearneysville, WV 25430-9802.