High-Temperature Effects on Growth and Propagule Formation in Hydrilla Biotypes

McFarland, Dwilette G. and Barko, John W. (1999) High-Temperature Effects on Growth and Propagule Formation in Hydrilla Biotypes. Journal of Aquatic Plant Management, 37, pp. 17-25.

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In consecutive greenhouse studies, growth and propagule formation were examined first in monoecious hydrilla [Hydrilla verticillata (L.f.) Royle], then in dioecious hydrilla, at three temperature levels (25, 30, and 35 C) and contrasted over three periods of growth (8, 12 and 16 wks). Each biotype was grown under natural photoperiods, decreasing from 14 hrs (in Oct, Nov, and Dec). For both biotypes, total biomass and root-to-shoot ratios were significantly reduced at 35 C; greater biomass was produced both at 25 and 30C. Increases in growth period generally enhanced total biomass and shoot production; however, shoot length was unresponsive to growth periods beyond 8 wks. The 35C treatment strongly impeded tuber formation and eliminat4ed the production of axillary turions; the number and biomass of these propagules peaked at lower temperatures under short photoperiods after 12 to 16 wks. Shoot elongation was stimulated with increases in temperature and was especially pronounced in the dioecious biotype. Notably, in the monoecious biotype, the number of shoots as a potential source of fragments, and tuber production (although reduced) occurred at relatively high levels under unfavorably hihg-temperature (35C) conditions. These results suggest that monoecious hydrilla may be better adapted to high temperatures than previously shown, and that the distribution of both biotypes in the U.S. could overlap further in southern states.

Item Type: Article
Title: High-Temperature Effects on Growth and Propagule Formation in Hydrilla Biotypes
Personal Creator/Author:
McFarland, Dwilette G.
Barko, John W.
Refereed: Yes
Journal or Publication Title: Journal of Aquatic Plant Management
Volume: 37
Page Range: pp. 17-25
Date: 1999
Issuing Agency: Aquatic Plant Management Society, Inc.
Uncontrolled Keywords: Hydrilla verticillata, biomass, morphology, tubers, turions, reproduction, thermal conditions, photoperiod
Subjects: Management
Item ID: 1740
Depositing User: Natalie Wiest
Date Deposited: 21 Nov 2008 23:37
Last Modified: 29 Sep 2011 20:09
URI: http://aquaticcommons.org/id/eprint/1740

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