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Phytotoxic evaluation of Phragmites australis: An investigation of aqueous extracts of different organs

Uddin, Md Nazim ORCID: 0000-0002-7904-4115, Caridi, Domenico and Robinson, Randall William (2012) Phytotoxic evaluation of Phragmites australis: An investigation of aqueous extracts of different organs. Marine and Freshwater Research, 63 (9). pp. 777-787. ISSN 1323-1650 (print), 1448-6059 (online)

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Phragmites australis is one of the most widespread and invasive plants on earth. Allelopathic interference has been considered as a possible way associated with its invasiveness in wetlands. A series of ecologically realistic experiments was conducted to explore allelochemical phytotoxicity of Phragmites. Germination bioassays using aqueous extracts of different organs (leaf, stem, root and rhizome) of Phragmites were tested with model seeds (Lactuca sativa and Raphanus sativus) and associated plant species (Juncus pallidus and Rumex conglomeratus). These studies showed that leaf and rhizome extracts exhibited strong inhibition on germination, biometric and physiological parameters (all P ≤ 0.001). Dose–response studies confirmed LC50 (4.68% and 11.25%) of Lactuca for leaf and rhizome extracts respectively. Root growth of Juncus and Rumex was inhibited by 75% and 30%, respectively, in leaf leachate-incorporated soil. Chlorophyll content and maximum quantum yield (Fv/Fm) were significantly reduced with leaf and rhizome leachates. The stability and quantity of water-soluble phenolics in anaerobic versus aerobic condition may influence phytotoxic effects to other species. Phragmites organs can be ranked in order of allelopathic potentiality as follows: leaf > rhizome > root > stem. The present study highlighted the potential impacts of allelochemicals on plant recruitment in wetlands invaded by Phragmites.

Item Type: Article
Uncontrolled Keywords: ResPubID25546 Australia, cell integrity, ecosystems, litter decomposition, radicle length, soil systems.
Subjects: FOR Classification > 0502 Environmental Science and Management
FOR Classification > 0602 Ecology
Faculty/School/Research Centre/Department > School of Engineering and Science
Depositing User: Yimin Zeng
Date Deposited: 22 Nov 2013 05:53
Last Modified: 05 Aug 2019 01:10
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Citations in Scopus: 18 - View on Scopus

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