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Natural chemicals produced by marine microalgae as predator deterrents can be used to control ciliates contamination in microalgal cultures

Tijdschriftbijdrage - Tijdschriftartikel

Large-scale production of microalgae for biofuels is often hampered by contamination of cultures with predatorsthat feed on microalgae. An important group of predators are ciliates. Some species of marine microalgae innatural ecosystems are known to produce chemicals that act as deterrents against predators. In this study, wetested whether these chemicals (trans,trans-2,4-decadienal, dimethyl sulfoniopropionate (DMSP), glycine betaineand proline) as well as a chemical analogue (methyl 3-(methylthio)propionate or MMP) can be used tocontrol contamination of cultures of the microalga Chlamydomonas by the predatory ciliate Sterkiella. All chemicalswere capable of rapidly eradicating the ciliates from a contaminated Chlamydomonas culture, but at ahigher dose also had a negative effect on the microalga. For each chemical an optimal dose was determined atwhich ciliates were controlled and losses in microalgal biomass productivity were minimized (0.13 mM decadienal,4.75 mM DMSP, 10 mM MMP, 250–300 mM proline and 250–300 mM glycine betaine). In the case ofDMSP, MMP and proline, biomass productivity was even the same as that of a non-contaminated culture. Thechemicals were also effective against other ciliates (Stylonychia notophora, Oxytricha sp. and 2 differentParamecium species). These chemicals therefore have potential to be used as natural pesticides to control contaminationof microalgal cultures by ciliates. Of all chemicals tested, DMSP and MMP are the most promisingbecause they are effective at a relatively low dose and have a limited negative effect on microalgal productivity.
Tijdschrift: Algal Research
ISSN: 2211-9264
Volume: 29
Pagina's: 297 - 303
Jaar van publicatie:2018