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Host genotype by parasite genotype interactions underlying the resistance of toxic microalgae species to the protist parasite parvilucifera sinerae

AuthorsFigueroa, Rosa Isabel ; Råberg, Lars; Alacid, Elisabet ; Turon, Marta ; Garcés, Esther
Issue Date31-Jul-2012
CitationProtist2012. Program: 40-41 (2012)
AbstractParasites are thought to have an important effect on host population genetic diversity, and may even be the selective force maintaining sexual reproduction. However, models focusing on the evolution of virulence commonly assume that parasite populations are genetically homogeneous; disregarding that different trade-offs between parasite virulence in different host types may exist. The protist parasite genus Parvilucifera infects a wide range of phytoplanktonic species within the group of microalgae known as dinoflagellates. Therefore, it is considered a generalist parasite. “Generalist” parasites have however a high potential to become specialized on different host species. If so, it may then be expected that parasite-microalgae relationships be based on host genotype by parasite genotype interactions. In such systems, certain hosts are resistant to one subset of the parasite's genotypes, while other hosts are resistant to a different subset. To investigate this hypothesis we have studied patterns of genotype interactions between 10 different parasite genotypes and 9 different host genotypes by assessing the proportion of infected hosts, the number of parasite spore stages and maximum host cell density achieved during infection. A genetic analysis of the 10 parasite genotypes employed is for first time shown in the species Parvilucifera sinerae (18S, LSU and ITS1 sequences). Preliminary results indicate that host resistance varies widely, being one strain resistant to all parasites. However, resistant genotype interactions involving other host strains were also found
DescriptionProtist2012, 29 July - 3 August, Oslo
Publisher version (URL)http://www.mn.uio.no/ibv/english/research/news-and-events/events/conferences-and-seminars/protist2012/Scientific-content/programme/
Appears in Collections:(ICM) Comunicaciones congresos
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