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- W62477382 abstract "The existence of allelopathic interactions among phytoplankton species remains controversial (for review see RICE 1984). Even if allelochemicals can be isolated, their action in the ecosystem, e.g. on phytoplankton seasonal succession, remains debatable. The question is whether they are released or actively excreted into the environment and what concentrations are necessary to be effective in the waterbody. A major problem relates to the large distances water-soluble allelochemicals have to move to reach target organisms in the phytoplankton communities (LEWIS 1986). On the other hand, reports on the isolation of allelochemicals from benthic cyanobacteria have been published in recent years (MASON et al. 1982, MOORE et al. 1984). We studied the allelopathic potential of the benthic cyanobacterium Fischerella muscicola, that strongly inhibits other cyanobacteria (FLORES & WOLK 1986) and to a lesser extent members of the chlorophytes and diatoms. We isolated the main active compound by a bioassay direeted extraction proeedure, purified it and ealled it fiseherellin. Results of the physieal and ehemieal eharaeteristies of fischerellin and its physiologieal role have been published recently (GROSS et al. 1991). Studying allelopathie interaetions in benthie eyanobaeteria is promising for several different reasons: many eyanobaeteria are known to produee a great number of different seeondary metabolites (MOORE 1981). Sueh eompounds are often investigated for pharmaeeutieal purposes, although they mayaIso have an eeological and physiologieal role. Additionally, in benthie and edaphic habitats allelopathy seems to be a powerful competitive strategy beeause of the proximity of adjaeent speeies. We suggest that eertain alleloehemieals are transmitted by direet contaet of eells for whieh purpose lipophilie inhibitors of low moleeular weight would be very suitable. As F. muscicola is able to kill algae growing adjacently, we studied the excretion and transfer of fischerellin. In this eontext it is also important that the quality and quantity of alleloehemieals produced might depend on environmental conditions, e.g. the strength of eompetition, nutrient depletion or shading (BOYER et al. 1987). Aecordingly, we studied fischerellin production by F. muscicola experimentally under nitrate, phosphate and light limitation. Materials and methods" @default.
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- W62477382 date "1994-10-01" @default.
- W62477382 modified "2023-09-28" @default.
- W62477382 title "Production of allelochemicals in Fischerella muscicola under different environmental conditions" @default.
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- W62477382 doi "https://doi.org/10.1080/03680770.1992.11900604" @default.
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