In Situ Allelopathic Potential of Myriophyllum Verticillatum (Haloragaceae) against selected Phytoplankton Species

Hilt, Sabine; Ghobrial, Mary G. N.; Gross, Elisabeth

In Situ Allelopathic Potential of Myriophyllum Verticillatum (Haloragaceae) against selected Phytoplankton Species

Dateien

23_Hilt_etal_2006_In_situ_allelo_Myr_vert.pdfGröße: 374.24 KBDownloads: 866

Datum

2006

Autor:innen

Hilt, Sabine

Ghobrial, Mary G. N.

Gross, Elisabeth

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Biologie

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Journal of Phycology. 2006, 42(6), pp. 1189-1198. ISSN 0022-3646. eISSN 1529-8817. Available under: doi: 10.1111/j.1529-8817.2006.00286.x

Zusammenfassung

The potential allelopathic impact of Myriophyllum verticillatum L. under in situ conditions was determined in a series of field and laboratory experiments. Coexistence experiments were performed in a lake dominated by M. verticillatum (Van Goor) Meffert where we exposed three unialgal phytoplankton cultures in dialysis tubes to macrophyte exudates regularly during the vegetated period. Plant content and exudation of polyphenolic compounds were determined, and the inhibitory activity of polypheno-containing extracts was tested in bioassays with cyanobacteria. To account for possible resource interference, we monitored growth and photosynthesis of phosphorus-limited and unlimited cyanobacterium Limnothrix redekei in dialysis tubes exposed to M. verticillatum in aquaria.
A high allelopathic potential of M. verticillatum was concluded from high tissue concentrations of total phenolic compounds of 6% 12% of dry matter, the demonstrated release of bioactive polyphenols into the surrounding medium, and the inhibition of cyanobacteria by extracts. We could not unambiguously demonstrate the exudation of polyphenols by M. verticillatum in situ due to interference with allochthonous humic compounds. In laboratory experiments,
L. redekei exhibited significantly reduced maximum relative electron transport rates when co-cultivated in dialysis tubes with M. verticillatum. The field dialysis tube experiment confirmed this result, accompanied by a decline of chl a and PSII activity for L. redekei and the diatom Stephanodiscus minutulus (Kütz.) Greve et Möller, but not for the green alga Scenedesmus armatus Chodat in August. At other times, either no effects or stimulatory effects were observed with all species. Nutrient limitation of the target species may have masked allelopathic effects, and M. verticillatum may have enhanced phytoplankton growth due to phosphorus leakage.

Fachgebiet (DDC)

570 Biowissenschaften, Biologie

Schlagwörter

allelopathy, Myriophyllum verticillatum, PAM-fluorometry, photosynthesis, shallow lakes, submerged macrophytes

Zitieren

ISO 690

HILT, Sabine, Mary G. N. GHOBRIAL, Elisabeth GROSS, 2006. In Situ Allelopathic Potential of Myriophyllum Verticillatum (Haloragaceae) against selected Phytoplankton Species. In: Journal of Phycology. 2006, 42(6), pp. 1189-1198. ISSN 0022-3646. eISSN 1529-8817. Available under: doi: 10.1111/j.1529-8817.2006.00286.x

BibTex

@article{Hilt2006Allel-6538,
  year={2006},
  doi={10.1111/j.1529-8817.2006.00286.x},
  title={In Situ Allelopathic Potential of Myriophyllum Verticillatum (Haloragaceae) against selected Phytoplankton Species},
  number={6},
  volume={42},
  issn={0022-3646},
  journal={Journal of Phycology},
  pages={1189--1198},
  author={Hilt, Sabine and Ghobrial, Mary G. N. and Gross, Elisabeth}
}

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    <dcterms:abstract xml:lang="eng">The potential allelopathic impact of Myriophyllum verticillatum L. under in situ conditions was determined in a series of field and laboratory experiments. Coexistence experiments were performed in a lake dominated by M. verticillatum (Van Goor) Meffert where we exposed three unialgal phytoplankton cultures in dialysis tubes to macrophyte exudates regularly during the vegetated period. Plant content and exudation of polyphenolic compounds were determined, and the inhibitory activity of polypheno-containing extracts was tested in bioassays with cyanobacteria. To account for possible resource interference, we monitored growth and photosynthesis of phosphorus-limited and unlimited cyanobacterium Limnothrix redekei in dialysis tubes exposed to M. verticillatum in aquaria.&lt;br /&gt;A high allelopathic potential of M. verticillatum was concluded from high tissue concentrations of total phenolic compounds of 6% 12% of dry matter, the demonstrated release of bioactive polyphenols into the surrounding medium, and the inhibition of cyanobacteria by extracts. We could not unambiguously demonstrate the exudation of polyphenols by M. verticillatum in situ due to interference with allochthonous humic compounds. In laboratory experiments,&lt;br /&gt;L. redekei exhibited significantly reduced maximum relative electron transport rates when co-cultivated in dialysis tubes with M. verticillatum. The field dialysis tube experiment confirmed this result, accompanied by a decline of chl a and PSII activity for L. redekei and the diatom Stephanodiscus minutulus (Kütz.) Greve et Möller, but not for the green alga Scenedesmus armatus Chodat in August. At other times, either no effects or stimulatory effects were observed with all species. Nutrient limitation of the target species may have masked allelopathic effects, and M. verticillatum may have enhanced phytoplankton growth due to phosphorus leakage.</dcterms:abstract>
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Universitätsbibliographie

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