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Pondweed Growth and Response to Herbicides under Controlled Light and Temperature

Published online by Cambridge University Press:  12 June 2017

Richard H. Hodgson  and
N. E. Otto
Richard H. Hodgson
Affiliation:
Crops Research Division, ARS, USDA
N. E. Otto
Affiliation:
Division of Research, BR, USDI
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Abstract

Vegetative propagules of sago pondweed (Potamogeton pectinatus L.) and American pondweed (P. nodosus Poir.) grown under a 14-hr photoperiod of light varying in chromatic composition produced plants with longer internodes and more extensive shoot and stolon development under red light than under blue. Pondweeds grown for 4 weeks under 25 to 400 ft-c of light made progressively more growth at the higher light intensities. Plant weight, branch number and stolon development increased while shoot length and shoot-root ratio decreased with increased light. Pondweeds grown under each of 5 light intensities at temperatures of 60, 70, or 80 F were treated with emulsified xylene or alkyl tolyl methyl trimethyl ammonium chloride. Pondweeds cultured at the higher light intensities and higher temperatures were progressively more injured. Injury from treatment with either herbicide increased with age and plant maturity from early vegetative to flower-bud stage. Equivalent injury was produced on plants of equivalent maturity regardless of chronological age. Pondweeds cultured under 400 ft-c of light and a 14-hr photoperiod required approximately 900 degree-days over a 49 F threshold to reach flower-bud stage.

Type
Research Article
Information
Weeds , Volume 11 , Issue 3 , July 1963 , pp. 232 - 237
Copyright
Copyright © 1963 Weed Science Society of America 

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