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AOBPreview originally published online on August 21, 2003
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Annals of Botany 92: 547-556, 2003
© 2003 Annals of Botany Company

Exposure to Asulox Inhibits the Growth of Mosses

J. K. ROWNTREE1, K. F. LAWTON{dagger},1, F. J. RUMSEY2 and E. SHEFFIELD*,1

1 School of Biological Sciences, 3.614 Stopford Building, University of Manchester, Oxford Road, Manchester M13 9PT, UK and 2 Natural History Museum, Cromwell Road, London SW7 5BD, UK

* For correspondence: Fax: 0161-2753938, e-mail l.sheffield{at}man.ac.uk
{dagger} Present address: Manchester Metropolitan University. Department of Environmental and Geographical Sciences, Manchester Metropolitan University, Chester Street, Manchester M1 5GD, UK

Received: 9 October 2002;; Returned for revision: 21 November 2002. Accepted: 13 June 2003; Published electronically: 21 August 2003

Asulox is a herbicide used to control bracken. Its effects on mosses were investigated to ascertain whether exposure proved as detrimental as found in parallel studies on pteridophytes. Mature gametophytes of 18 mosses were exposed to a range of concentrations of Asulox under standard conditions and the effects on growth monitored. Plants were cut to a standard length, exposed to Asulox solution for 24 h, grown for 3 weeks and total elongation (main stem and branches) measured. EC50 values were calculated and species ranked according to sensitivity. The effects of exposure on total elongation were compared with those on main stem elongation alone. Under the conditions tested, the total elongation of all species was inhibited after exposure to Asulox. The amount of elongation observed after exposure was different for different species and inhibition of elongation occurred at different exposure concentrations. A single regression equation was not adequate to describe the dose response curves of all species tested. An ability to produce secondary branches may confer increased tolerance to Asulox exposure. It is concluded that mosses suffer detrimental effects after exposure to Asulox at concentrations similar to those that affect fern gametophytes such as bracken.

Key words: Asulox, asulam, bryophyte, moss, growth, elongation, response curves, hormesis.


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