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Variable growth responses of water thyme (Hydrilla verticillata) to whole-cell extracts of Cylindrospermopsis raciborskii

journal contribution
posted on 06.12.2017, 00:00 authored by Susan KinnearSusan Kinnear, Leo Duivenvoorden, Larelle FabbroLarelle Fabbro
Static-renewal ecotoxicity trials monitored growth of Hydrilla verticillata in conjunction with exposure to Cylindrospermopsis raciborskii whole-cell extracts containing the cyanotoxin cylindrospermopsin (CYN). Maximum exposure concentrations were 400 micorgrams per litre CYNover 14 days. The responses of Hydrilla to the treatments were variable according to the toxin concentrations and lengths of exposure. Plant deaths, chlorosis, and necrosis were not recorded from treated plants. However, Hydrilla experienced significant growth stimulation and redistribution of plant resources in conjunction with exposure to the whole-cell extracts. Root production was particularly impacted. The results of this study imply that root production could aid in reducing C. raciborskii cell concentrations and CYN toxicity. Results of chlorophyllanalyses differed, indicating that CYN in whole-cell extracts might exert complex effects on photosynthesis.This is the first study to describe the responses of an aquatic macrophyte following exposure to C. raciborskii whole-cell extracts containing the cyanotoxin cylindrospermopsin.

Funding

Category 3 - Industry and Other Research Income

History

Volume

54

Issue

2

Start Page

187

End Page

194

Number of Pages

8

eISSN

1432-0703

ISSN

0090-4341

Location

USA

Publisher

Springer (part of Springer Nature)

Language

en-aus

Peer Reviewed

Yes

Open Access

No

External Author Affiliations

Centre for Environmental Management;

Era Eligible

Yes

Journal

Archives of Environmental Contamination and Toxicology