Molecular Evidence for Host–Symbiont Specificity in Soritid Foraminifera

Article Article scientifique Article Molecular Evidence for Host–Symbiont Specificity in Soritid Foraminifera eng 2005-11-03 2005-12 author Garcia Lydia 509997 author Pochon Xavier 519542 author Pawlowski Jan Wojciech 23432 399-412 10.1016/j.protis.2005.08.003 16310745 1434-4610 Symbiosis between the dinoflagellate genus Symbiodinium and various invertebrates and protists is an ubiquitous phenomenon in shallow tropical and subtropical waters. Molecular studies undertaken on cnidarian symbionts revealed the presence of several distinctive lineages or subgeneric clades of Symbiodinium whose taxonomic level provides limited information about the specificity between invertebrate hosts and their symbionts. This contrasts with the finding of several Symbiodinium clades being present almost exclusively in foraminifera and belonging to the subfamily Soritinae. To test whether such specificity also exists at a lower taxonomic level within Soritinae, we obtained the SSU rDNA sequences from 159 soritid individuals collected in nine localities worldwide and representing all known morphospecies of this subfamily. For each individual, the symbionts were determined either by sequencing or by RFLP analysis. We distinguished 22 phylotypes of Soritinae in relation with a number of symbiont “groups” corresponding to 3 clades and 5 subclades of Symbiodinium. Among the 22 soritid phylotypes, 14 show strict symbiont specificity and only one was found to be a host for more than two “groups” of Symbiodinium. It is suggested that the strong host–symbiont specificity observed in Soritinae is a combined effect of a selective recognition mechanism, vertical transmission of symbionts, and biogeographical isolation. Foraminifera Molecular phylogeny RDNA Soritacea Symbiodinium Symbiosis Dewey 590 44 Département de génétique et évolution 162 false Protist 156 4 058c2482-e30a-4f33-8125-b7125062f35c Article (Published version) Restricted Garcia-Cuetos_PRT_2005156399.pdf 414660 application/pdf a39d381a8477d13c71ebf7a2cf4ea2d199e92b2710be8ed429ddc7d82e575d0f restrictedAccess Faculté des sciences / Section de biologie / Département de génétique et évolution

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Molecular Evidence for Host–Symbiont Specificity in Soritid Foraminifera	Protist			2005	52	0

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Garcia, Lydia