Overview

Brief Summary

Introduction

  • Guillardia described by Hill and Wetherbee; type species Guillardia theta (marine; Hill and Wetherbee 1990)
  • Hanusia described by Deane et al; types species Hanusia phi (marine; Deane et al. 1998)

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Comprehensive Description

Characteristics

  • Type of biliprotein: PE545
  • Nucleomorph free in periplastidial space
  • Light microscopy: reddish cryptophytes, one plastid with a pyrenoid
  • Ultrastructure of Gullardia: sheet-like inner periplast component, longitudinal plates (SPC), gullet, non-keeled rhizostyle (Gillott and Gibbs 1983; Hill and Wetherbee 1990)
  • Ultrastructure of Hanusia: sheet-like inner periplast component, rosulate scales (SPC), furrow, keeled rhizostyle (Gillott and Gibbs 1983; Deane et al. 1998)

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Physical Description

Type Information

Type locality: USA: Connecticut: Milford Harbor
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Source: AlgaeBase

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Evolution and Systematics

Evolution

Discussion of Phylogenetic Relationships

View Guillardia theta | Hanusia phi Tree

Since only one strain of each genus has been examined thus far, there is insufficient data to identify potential dimorphisms or inconsistencies in systematics (Marin et al. 1998; Deane et al. 2002; Hoef-Emden et al. 2002). Guillardia theta strain CCMP327 was the model cryptophyte chosen for first nuclear genome sequencing projects. Its complete nucleomorph and plastid genomes have been sequenced (Douglas and Penny 1999; Douglas et al. 2001).

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Wikipedia

Guillardia

Guillardia is a genus of flagellate cryptomonad algae belonging to the family Geminigeraceae, containing a secondary plastid within a reduced cytoplasmic compartment that contains a vestigial nucleomorph. There is only one characterised member of this genus, Guillardia theta.

Genomes[edit]

Guillardia theta was the first cryptophyte to have its nuclear genome sequenced. The genome contains 87 Mbp, encoding around 24,840 genes.[1] The complete nucleomorph[2] and plastid [3] genomes have been sequenced, containing 551 kbp and 121 kbp respectively.

References[edit]

  1. ^ Bruce A. Curtis, Goro Tanifuji, Fabien Burki, Ansgar Gruber, Manuel Irimia, Shinichiro Maruyama, Maria C. Arias, Steven G. Ball, Gillian H. Gile, Yoshihisa Hirakawa, Julia F. Hopkins, Alan Kuo, Stefan A. Rensing, Jeremy Schmutz, Aikaterini Symeonidi, Marek Elias, Robert J. M. Eveleigh, Emily K. Herman, Mary J. Klute, Takuro Nakayama, Miroslav Oborník, Adrian Reyes-Prieto, E. Virginia Armbrust, Stephen J. Aves, Robert G. Beiko, Pedro Coutinho, Joel B. Dacks, Dion G. Durnford, Naomi M. Fast, Beverley R. Green, Cameron J. Grisdale, Franziska Hempel, Bernard Henrissat, Marc P. Höppner, Ken-Ichiro Ishida, Eunsoo Kim, Luděk Kořený, Peter G. Kroth, Yuan Liu, Shehre-Banoo Malik, Uwe G. Maier, Darcy McRose, Thomas Mock, Jonathan A. D. Neilson, Naoko T. Onodera, Anthony M. Poole, Ellen J. Pritham, Thomas A. Richards, Gabrielle Rocap, Scott W. Roy, Chihiro Sarai, Sarah Schaack, Shu Shirato, Claudio H. Slamovits, David F. Spencer, Shigekatsu Suzuki, Alexandra Z. Worden, Stefan Zauner, Kerrie Barry, Callum Bell, Arvind K. Bharti, John A. Crow, Jane Grimwood, Robin Kramer, Erika Lindquist, Susan Lucas, Asaf Salamov, Geoffrey I. McFadden, Christopher E. Lane, Patrick J. Keeling, Michael W. Gray, Igor V. Grigoriev & John M. Archibald (2012). "Algal genomes reveal evolutionary mosaicism and the fate of nucleomorphs". Nature 492 (7427): 59–65. doi:10.1038/nature11681. PMID 23201678. 
  2. ^ Susan Douglas, Stefan Zauner, Martin Fraunholz, Margaret Beaton, Susanne Penny, Lang-Tuo Deng, Xiaonan Wu, Michael Reith, Thomas Cavalier-Smith & Uwe-G. Maier (2001). "The highly reduced genome of an enslaved algal nucleus". Nature 410 (6832): 1091–1096. doi:10.1038/35074092. PMID 11323671. 
  3. ^ Susan E. Douglas & Susanne L. Penny (1999). "The plastid genome of the cryptophyte alga, Guillardia theta: complete sequence and conserved synteny groups confirm its common ancestry with red algae". Journal of Molecular Evolution 48 (2): 236–244. doi:10.1007/PL00006462. PMID 9929392. 


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