Abstract
The parasite contamination make difficult laboratory cultivation of green algae and decrease significantly the production of microalgal biomass during industrial cultivation. In the present study the influence of the endogenous abscisic acid content (determinate by gas chromatography) on the host-parasite relationship in different ontogenetic phases of the host Scenedesmus as well as resistance induction after treatment of synchronous algal culture with ABA were studied. Synchronization of algae was carried out by alteration of light and dark periods. The age groups under study were: autospores (at the beginning of the light period), growing cells, mature cells (belonging to in the end of the light period) and mature cells, starting to release autospore at the beginning of dark phases. The higher levels of endogenous ABA during the algal autospore formation as well as exogenous ABA supply of (10−5 M) inhibited the infection process in the pathosystem green microalga Scenedesmus acutus and unicellular fungal parasite Phlyctidium scenedesmi. The treatment with fluridone 10−7 M (an inhibitor of ABA biosynthesis) increased the host susceptibility during all ontogenetic phases. The susceptibility of S. acutus to the chytridial infection depended on the endogenous ABA level during different ontogenetic stages of the alga.
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Abbreviations
- ABA:
-
abscisic acid
- Flu:
-
fluridone
- ROS:
-
reactive oxygen species
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Pouneva, I.D. Effect of abscisic acid and ontogenic phases of the host alga on the infection process in the pathosystem Scenedesmus acutus — Phlyctidium scenenedesmi . Acta Physiol Plant 28, 395–400 (2006). https://doi.org/10.1007/BF02706621
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DOI: https://doi.org/10.1007/BF02706621