Molecular systematics of Volvocales (Chlorophyceae, Chlorophyta) based on exhaustive 18S rRNA phylogenetic analyses

Nakada, Takashi; Misawa, Kazuharu; Nozaki, Hisayoshi

doi:10.1016/j.ympev.2008.03.016

Cited by 166 publications

(317 citation statements)

References 35 publications

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“…Although the genus is now recognized as polyphyletic, the model species C. reinhardtii is closely related to multicellular volvocine algae that together form a monophyletic clade with C. reinhardtii as an outgroup (Fig. 3A) (Pröschold et al 2001(Pröschold et al , 2005Herron and Michod 2008;Nakada et al 2008). The last common ancestor of this clade was estimated to have lived 200 million years ago (Herron et al 2009), but it is worth noting that the single fossil chlorophyte alga used for calibration in the above dating study has produced incongruences in other analyses and may not be part of the taxonomic group it was originally identified with (Berney and Pawlowski 2006).…”

Section: Overview Of Volvocine Algaementioning

confidence: 99%

Green Algae and the Origins of Multicellularity in the Plant Kingdom

Umen

2014

Cold Spring Harbor Perspectives in Biology

121

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The green lineage of chlorophyte algae and streptophytes form a large and diverse clade with multiple independent transitions to produce multicellular and/or macroscopically complex organization. In this review, I focus on two of the best-studied multicellular groups of green algae: charophytes and volvocines. Charophyte algae are the closest relatives of land plants and encompass the transition from unicellularity to simple multicellularity. Many of the innovations present in land plants have their roots in the cell and developmental biology of charophyte algae. Volvocine algae evolved an independent route to multicellularity that is captured by a graded series of increasing cell-type specialization and developmental complexity. The study of volvocine algae has provided unprecedented insights into the innovations required to achieve multicellularity.

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Section: Overview Of Volvocine Algaementioning

confidence: 99%

Green Algae and the Origins of Multicellularity in the Plant Kingdom

Umen

2014

Cold Spring Harbor Perspectives in Biology

121

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“…Studies of molecular data have corroborated a close alliance between some Haematococcus taxa and Stephanosphaera (Buchheim & Chapman, 1991;Pröschold et al, 2001;Buchheim et al, 2002;Nakada & Nozaki, 2007Nakada et al, 2008aNakada et al, , 2008bDemchenko et al, 2012). However, some of these studies have suggested that Haematococcus is not strictly monophyletic, as H. droebakensis, H. zimbabwiensis ( Fig.…”

Section: Introductionmentioning

confidence: 99%

“…3) and Stephanosphaera (Fig. 4) are allied to the exclusion of H. pluvialis (Buchheim & Chapman, 1991;Hepperle et al, 1998;Pröschold et al, 2001;Nakada et al, 2008b;Demchenko et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

The blood alga: phylogeny ofHaematococcus(Chlorophyceae) inferred from ribosomal RNA gene sequence data

Buchheim

Sutherland

Buchheim

et al. 2013

European Journal of Phycology

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The status of the green algal genera Haematococcus and Stephanosphaera has been a source of debate among algal systematists. A phylogenetic alliance between Haematococcus (sensu lato) and the colonial Stephanosphaera was affirmed by earlier molecular phylogenetic investigations. Although the data suggested that the genus Haematococcus may not be a monophyletic group, taxon sampling limited the scope of any potential taxonomic revision. Results from new molecular phylogenetic analyses of data from the 18S and 26S rRNA genes support the establishment of a separate genus, Balticola, as originally proposed by Droop in 1956. Haematococcus remains as a valid genus, with H. pluvialis as its only member. The monotypic status of H. pluvialis is supported both by molecular phylogenetic analyses of the ribosomal RNA genes and assessments of molecular evolution in the ITS2 sequences of H. pluvialis strains. The near-complete absence of compensatory base changes in a sequencestructure analysis of the highly variable ITS2 gene from more than 40 geographically diverse isolates of H. pluvialis corroborates the unity of the species inferred from molecular phylogenetic analyses of 18S and 26S rRNA gene sequence data.

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“…The chlorophyte Chlamydomonas monoica (59), one of an interfertile group that includes Chlamydomonas noctigama and Chlamydomonas geitleri, is a member of the Moewusii clade that also includes Chlamydomonas eugametos; this lineage is only distantly related to the Reinhardtinia clade that includes the wellstudied species Chlamydomonas reinhardtii (60)(61)(62). The eisosomes of C. eugametos have been imaged previously (37,38).…”

Section: Resultsmentioning

confidence: 99%

“…Another comparison of interest is between the vegetative cells of Chlamydomonas reinhardtii (Reinhardtinia clade) (60) and Chlamydomonas monoica (Moewusii clade) (61), since both construct similar vegetative cell walls by using a related group of hydroxyproline-rich glycoproteins (38,80,81). A proposed function of eisosomes is to anchor the wall to the cell membrane (25); this concept is framed in the context of the dense cell walls of fungi.…”

Section: Discussionmentioning

confidence: 99%

Eisosome Ultrastructure and Evolution in Fungi, Microalgae, and Lichens

et al. 2015

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Eisosomes are among the few remaining eukaryotic cellular differentations that lack a defined function(s). These trough-shaped invaginations of the plasma membrane have largely been studied in Saccharomyces cerevisiae, in which their associated proteins, including two BAR domain proteins, have been identified, and homologues have been found throughout the fungal radiation. Using quick-freeze deep-etch electron microscopy to generate high-resolution replicas of membrane fracture faces without the use of chemical fixation, we report that eisosomes are also present in a subset of red and green microalgae as well as in the cysts of the ciliate Euplotes. Eisosome assembly is closely correlated with both the presence and the nature of cell walls. Microalgal eisosomes vary extensively in topology and internal organization. Unlike fungi, their convex fracture faces can carry lineagespecific arrays of intramembranous particles, and their concave fracture faces usually display fine striations, also seen in fungi, that are pitched at lineage-specific angles and, in some cases, adopt a broad-banded patterning. The conserved genes that encode fungal eisosome-associated proteins are not found in sequenced algal genomes, but we identified genes encoding two algal lineage-specific families of predicted BAR domain proteins, called Green-BAR and Red-BAR, that are candidate eisosome organizers. We propose a model for eisosome formation wherein (i) positively charged recognition patches first establish contact with target membrane regions and (ii) a (partial) unwinding of the coiled-coil conformation of the BAR domains then allows interactions between the hydrophobic faces of their amphipathic helices and the lipid phase of the inner membrane leaflet, generating the striated patterns.

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Molecular systematics of Volvocales (Chlorophyceae, Chlorophyta) based on exhaustive 18S rRNA phylogenetic analyses

Cited by 166 publications

References 35 publications

Green Algae and the Origins of Multicellularity in the Plant Kingdom

Green Algae and the Origins of Multicellularity in the Plant Kingdom

The blood alga: phylogeny ofHaematococcus(Chlorophyceae) inferred from ribosomal RNA gene sequence data

Eisosome Ultrastructure and Evolution in Fungi, Microalgae, and Lichens

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