The stramenopiles from a molecular perspective: 16S-like rRNA sequences from Labyrinthuloides minuta and Cafeteria roenbergensis

Leipe, Detlef D.; Wainright, Patricia O.; Gunderson, John H.; Porter, David D.; Patterson, D. J.; Valois, Frederica W.; Himmerich, S.; Sogin, Mitchell L.

doi:10.2216/i0031-8884-33-5-369.1

Cited by 171 publications

(85 citation statements)

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“…; Leipe et al 1994;Medlin et al 1997b). The closest relatives discovered so far are the Bolidophyceae, which are picoplanktonic algae with a simplified cellular organization (Guillou et al 1999).…”

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Evolution of the diatoms: insights from fossil, biological and molecular data

2006

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Molecular sequence analyses have yielded many important insights into diatom evolution, but there have been few attempts to relate these to the extensive fossil record of diatoms, probably because of unfamiliarity with the data available, which are scattered widely through the geological literature. We review the main features of molecular phylogenies and concentrate on the correspondence between these and the fossil record; we also review the evolution of major morphological, cytological and life cycle characteristics, and possible diatom origins. The first physical remains of diatoms are from the Jurassic, and well-preserved, diverse floras are available from the Lower Cretaceous. Though these are unequivocally identifiable as centric diatoms, none except a possible Stephanopyxis can be unequivocally linked to lineages of extant diatoms, although it is almost certain that members of the Coscinodiscophyceae (radial centrics) and Mediophyceae (polar centrics) were present; some display curious morphological features that hint at an unorthodox cell division mechanism and life cycle. It seems most likely that the earliest diatoms were marine, but recently discovered fossil deposits hint that episodes of terrestrial colonization may have occurred in the Mesozoic, though the main invasion of freshwaters appears to have been delayed until the Cenozoic. By the Upper Cretaceous, many lineages are present that can be convincingly related to extant diatom taxa. Pennate diatoms appear in the late Cretaceous and raphid diatoms in the Palaeocene, though molecular phylogenies imply that raphid diatoms did in fact evolve considerably earlier. Recent evidence shows that diatoms are substantially underclassified at the species level, with many semicryptic or cryptic species to be recognized; however, there is little prospect of being able to discriminate between such taxa in fossil material.

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confidence: 99%

Evolution of the diatoms: insights from fossil, biological and molecular data

2006

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“…The product was sequenced using automatic sequencing (Applied Biosystems, Inc.) and the data compared to those held in computer databases. The sequence (1680 bp) was most similar to the SSU rDNA data from Cafeteria roenbergensis (EMBL accession number L27633; Leipe et al 1994) with differences in 5 positions (2 additional, 2 different, 1 missing). Fourteen ambiguous positions in the SSU rDNA data from C. roenbergensis were resolved by our work.…”

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confidence: 70%

An assessment of lesions in bay scallops Argopecten irradians attributed to Perkinsus karlssoni (Protozoa, Apicomplexa)

Cl¹,

Se²,

Sk³

et al. 1996

Dis. Aquat. Org.

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ABSTRACT-Leslons found in bay scallops Argopecten ~r r a d imore than 1 organism associated with this name which ans imported into Atlantic Canada for culture were attributed may later be described outside the genus Perkinsus, to a parasite Perklnsus karlssonj It appears, however, that Bay scallops Argopecten irradians imported into stages froin several organisms were combined to create the life cvcle of P karlsson~. (McGladdery et al. 1991, McGladdery et al. 1993). There are significant differences, however, between P. karlssoni and the other 3 described species of Perkinsus. P. karlssoni is used hereafter as a matter of convenience with the recognition that there may be 'Present address CSIRO Divls~on of Fishenes, GPO Box 1538, Hobart, Tasmania 7001, Australia E-mall louise goggin@ml csiro au Perkinsus. P. karlssoni which were healthy when preserved have not been seen under the electron microscope. The organisms identified as P. karlssoni in electron micrographs published by Whyte et al. (1994) (Fig. 18a, b) are dead organisms encapsulated by ceroid and do not resemble Perkinsus.In histological sections, the meront of species of Perkinsus is distinguished by a large eccentric vacuole which sometimes contains a vacuoplast. A vacuole was rarely observed in P. karlssoni, but a dense basophilic body was found next to the nucleus which could b e equivalent to the vacuoplast of P. marinus (McGladdery et al. 1991). The basophilic body of P. karlssoni, however, was not contained in a large eccentric vacuole, which makes this association unlikely. Furthermore, the presence of a basophilic body does not diagnose a Perkinsus spp. because the vacuoplast can be either basophilic or eosinophilic in P. marinus (Mackin et al. 1950) or slightly eosinophilic (when present) in P. olseni (Lester & Davis 1981).Perkinsus karlssoni differs from described species of Perkinsus in other ways. P. karlssoni was not recognised by an antibody raised against the meront of P. O Inter-Research 1996 Resale of full a r t~c l e not p e r m~t t e d

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“…The basal relationships among the labyrinthulomycetes, bicoesida and Blastocystis were unsolved and not supported (Riisberg et al, 2009), as previous SSU rDNA phylogenies (Cavalier-Smith et al, 1994, Van de Peer et al, 2000. Those studies either showed that the labyrinthulomycetes as the sister group of the bicoeceans or showed the labyrinthulomycetes, then bicoeceans emerging from successive divergences at the base of the stramenopiles (Cavalier-Smith & Chao 2006, Leipe et al, 1994. In contrast, Oudot-Le Secq et al (2006)'s analysis of mitochondrial data showed the labyrinthulomycetes and oomycetes forming a monophyletic group.…”

Section: Position In the 'Tree Of Life'mentioning

confidence: 96%

“…The labyrinthulomycetes presently belong to the Kingdom Stramenopiles, which also accommodate the photosynthetic ochrophytes (brown algae, golden brown algae and diatoms), along with the non-photosynthetic free-living bicoeceans, and oomycetes which are well known as serious plant pathogens ( Fig. 1) (Cavalier-Smith, 1998, Leipe et al, 1994, OudotLe Secq et al, 2006, Tsui et al, 2009). Labyrinthulomycetes share Stramenopile characters in having cell walls of thin scales (Chamberlain & Moss, 1988), tubular mitochondria, and biflagellate zoospores with one smooth flagellum and one bearing tripartite tubular hairs (Patterson, 1989).…”

Section: Position In the 'Tree Of Life'mentioning

confidence: 99%