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@ARTICLE{Krienitz:40434,
      author       = {Krienitz, L. and Hegewald, E. and Hepperle, D. and Huss, V.
                      A. R. and Rohr, T. and Wolf, M.},
      title        = {{P}hylogenetic relationship of {C}hlorella and
                      {P}arachlorella nov. gen. ({C}hlorophyta,
                      {T}rebouxiophyceae)},
      journal      = {Phycologia},
      volume       = {43},
      issn         = {0031-8884},
      address      = {Lawrence, KS},
      publisher    = {Soc.},
      reportid     = {PreJuSER-40434},
      pages        = {529 - 542},
      year         = {2004},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {Chlorella is one of the archetypical forms of coccoid green
                      algae and one of the best-studied phototrophic eukaryotes.
                      However, its systematics remains enigmatic due to conflicts
                      between morphological and molecular phylogenetic approaches.
                      The sequences of the 18S ribosomal RNA gene of nine strains
                      of Chlorella and related taxa, and the ITS2 region of 17
                      strains of Chlorellaceae were determined and included in
                      phylogenetic analyses. The secondary structure of the ITS2
                      region of C. vulgaris was compared to that of Parachlorella
                      beijerinckii. All phylogenetic analyses showed that the
                      Chlorellaceae form a clade within the Trebouxiophyceae. The
                      Chlorellaceae studied here are divided into two sister
                      groups: (1) the Parachlorella-clade with Parachlorella
                      beijerinckii gen. et sp. nov. and P. kessleri comb. nov. as
                      well as Dicloster acuatus and Closteriopsis acicularis; and
                      (2) the Chlorella-clade including the 'true' spherical
                      Chlorella species C. vulgaris, C. lobophora and C.
                      sorokiniana. The latter are intermixed with taxa that differ
                      in morphology and were formerly classified in other families
                      of coccoid green algae: Actinastrum hantzschii (formerly
                      Coelastraceae), Diacanthos belenophorus (formerly
                      Oocystaceae), Dictyosphaerium pulchellum (formerly
                      Botryococcaceae), Didymogenes anomala and D. palatina
                      (formerly Scenedesmaceae) and Micractinium pusillum
                      (formerly Micractiniaceae). It was shown that morphological
                      criteria traditionally used for classification (e.g. spines,
                      mucilaginous envelopes or the formation of colonies or
                      coenobia) are burdened with a high degree of phenotypic
                      plasticity. These plastic traits represent adaptations to
                      environmental factors in order to optimize floating in the
                      water column and to resist grazing pressure. A genus and
                      species concept in Chlorellaceae remains provisional,
                      because, in most cases, there is still a lack of classical
                      and molecular approaches to identify clear phylogenetic
                      lineages.},
      keywords     = {J (WoSType)},
      cin          = {ICG-III},
      ddc          = {580},
      cid          = {I:(DE-Juel1)VDB49},
      pnm          = {Chemie und Dynamik der Geo-Biosphäre},
      pid          = {G:(DE-Juel1)FUEK257},
      shelfmark    = {Plant Sciences / Marine $\&$ Freshwater Biology},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000224368700004},
      doi          = {10.2216/i0031-8884-43-5-529.1},
      url          = {https://juser.fz-juelich.de/record/40434},
}