Allelopathic
effects among selected species of
phytoplankton
and macrophytes
D.
Chicalote-Castillo1, P. Ram?rez-Garc?a1* and M.L.
Mac?as-Rubalcava2
1Universidad
Nacional Aut?noma de M?xico, FES-Iztacala, Research and Postgraduate
Division, Av. de los Barrios No. 1,
54090
Tlalnepantla, Estado de M?xico, M?xico
2Universidad
Nacional Aut?noma de Mexico. Institute of Chemistry Department of Natural
Products Ciudad Universitaria,
Mexico City, Del.Coyoac?n
04510, Mexico
*Corresponding
Author E-mail: micro@unam.mx
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Key
words
Allelopathy
Microcystis aeruginosa
Phragmites australis
Scenedesmus acutus
Schoenoplectus
californicus
Publication Data
Paper received : 13.09.2016
Revised received : 03.01.2017
Re-revised received :
24.05.2017
Accepted : 11.08.2017
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Abstract
Aim: To understand the
allelopathy among different taxonomic levels of freshwater photoautotrophs,
the effect of aqueous extracts of Phragmites australis and Schoenoplectus
californicus on monocultures of Microcystis aeruginosa and Scenedesmus
acutus was investigated. In addition, the cell extract and filtered
medium of each phytoplankton species were used and tested between them.
Methodology:
In
the macrophyte bioassays against alga, the allelopathic effect was evaluated
separately using 10 and 20 mg of aqueous extract of leaf, stem and rhizome of
Phragmites, as well as the stem and rhizome of Schoenoplectus.
In the assays between the phytoplankton species, the cell extract (12.44 ?
0.16 ?gl-1 microcistin-LR equivalents) and the filtered culture
medium (2.98 ? 0.03 ?gl-1 microcistin-LR equivalents) of
Microcystis were used in 100 and 50% and were added to the Scenedesmus
monocultures. In the same proportion, the cell extract and the filtered
culture medium of Scenedesmus on monocultures of Microcystis were
used..
Results:
In
Phragmites, leaf extract showed greater inhibition activity than the
other plant organs on Microcystis cultures. The stem and rhizome
showed a larger decrease for the growth of Scenedesmus cultures. For Schoenoplectus,
the stem extract showed a greater inhibitory effect than the rhizome extract;
this was observed on both alga and cyanobacteria. Microcystis when in
contact with the cellular extract of Scenedesmus, it was observed that
the bioactive containing substances in the extract had a greater inhibitory
activity.
Interpretation: The leaf, stem and rhizome extracts of Phragmites
and Schoenoplectus showed a different affinity of the allelopathic
activity on Microcystis and Scenedesmus, suggesting a
species-specific relationship.
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conclusions enforced or derived, rest completely with the author(s).
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