Phylogeny ofGonatozygonandGenicularia(Gonatozygaceae, Desmidiales) based onrbcL sequences

Park, Nellie E.; Karol, Kenneth G.; Hoshaw, Robert W.; McCourt, Richard M.

doi:10.1080/09670269600651531

Cited by 15 publications

(13 citation statements)

References 25 publications

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“…1) and MP (Fig. 2) trees also strongly support the monophyly of all the conjugating green algae within the charophycean algae, as do all earlier molecular studies (Surek et al 1994, Park et al 1996, Huss and Kranz 1997, Chapman et al 1998, Besendahl and Bhattacharya 1999, McCourt et al 2000). Within this lineage, all the placoderm desmids (Desmidiales) form a strongly supported monophyletic clade and saccoderm taxa seem to be ancestral to them.…”

Section: Discussionsupporting

confidence: 78%

“…In the SSU rDNA NJ tree of Huss and Kranz (1997), the clade with Gonatozygon and Genicularia diverged deeply within the Desmidiaceae, with 100% bootstrap values, from the other clade comprising the other four genera. Park et al (1996) also recognized, in their study of rbcL, these two genera form a strongly supported monophyletic clade. Although the monophyletic clade of Gonatozygon and Genicularia was reconfirmed in a study of the SSU rDNA coding region and 1506 group I intron by Besendahl and Bhattacharya (1999), this lineage is still considered to be a sublineage within the Desmidiaceae.…”

Section: Discussionmentioning

confidence: 87%

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MONOPHYLY OF THE GENUS CLOSTERIUM AND THE ORDER DESMIDIALES (CHAROPHYCEAE, CHLOROPHYTA) INFERRED FROM NUCLEAR SMALL SUBUNIT rDNA DATA

Denboh

Hendrayanti

Ichimura

2001

Journal of Phycology

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We newly sequenced the nuclear‐encoded small subunit (SSU) rDNA coding region for 21 taxa of the genus Closterium. The new sequences were integrated into an alignment with 13 known sequences of conjugating green algae representing six traditional families (i.e. Zygnemataceae, Mesotaeniaceae, Gonatozygaceae, Peniaceae, Closteriaceae, and Desmidiaceae) and five known charophycean sequences as outgroups. Both maximum likelihood and maximum parsimony analyses supported with high bootstrap values one large clade containing all placoderm desmids (Desmidiales). All the Closterium taxa formed one clade with 100% bootstrap support, indicating their monophyly, but not paraphyly, as suggested earlier. As to the taxa within the genus Closterium, we found two clades of morphologically closely related taxa in both maximum likelihood and maximum parsimony trees. They corresponded to the C. calosporum species complex and the C. moniliferum‐ehrenbergii species complex. It is of particular interest that the homothallic entity of C. moniliferum v. moniliferum was distinguished from and ancestral to all other entities of the C. moniliferum‐ehrenbergii species complex. Superimposing all 50 charophycean sequences on the higher order SSU rRNA structure model of Closterium, we investigated degrees of nucleotide conservation at a given position in the nucleotide sequence. A characteristic “signature” structure to the genus Closterium was found as an additional helix at the tip of V1 region. In addition, eight base deletions at the tip of helix 10 were found to be characteristic of the C. calosporum species complex, C. gracile, C. incurvum, C. pleurodermatum, and C. pusillum v. maius. These taxa formed one clade with an 82% bootstrap value in maximum parsimony analysis.

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Section: Discussionsupporting

confidence: 78%

Section: Discussionmentioning

confidence: 87%

MONOPHYLY OF THE GENUS CLOSTERIUM AND THE ORDER DESMIDIALES (CHAROPHYCEAE, CHLOROPHYTA) INFERRED FROM NUCLEAR SMALL SUBUNIT rDNA DATA

Denboh

Hendrayanti

Ichimura

2001

Journal of Phycology

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“…The Zygnematales are a phylogenetically distinct, cosmopolitan (up to 12,000 species, Hoshaw et al 1990) order of charophyte green algae. Phylogenetic analyses of SSU rDNA and rbcL coding regions (McCourt et al 1995, Park et al 1996 and the presence of the 1506 intron in all Zygnematales (except Spirogyra spp. Link [interpreted as a rare loss], Bhattacharya et al 1994) provide strong evidence for the monophyly of this lineage.…”

mentioning

confidence: 99%

EVOLUTIONARY ANALYSES OF SMALL‐SUBUNIT rDNA CODING REGIONS AND THE 1506 GROUP I INTRONS OF THE ZYGNEMATALES (CHAROPHYCEAE, STREPTOPHYTA)

Besendahl¹,

Bhattacharya²

1999

Journal of Phycology

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We sequenced the small-subunit (SSU) rDNA coding region and 1506 group I intron (that interrupts this gene) in Closterium ehrenbergii Menegh. ex Ralfs, Closterium littorale Gay, Cylindrocystis brebissonii (Menegh.) de Bary, Penium margaritaceum (Ehr.) de Bréb. ex Ralfs, and Staurastrum punctulatum de Bréb. and the 1506 intron in Sirogonium sticticum (J.E. Smith) Kütz. (Zygnematales). Reverse transcriptase (RT)/PCR analyses demonstrated that the 1506 introns are not present in vivo in mature rRNA. Splicing analyses in vitro showed, however, that these introns do not catalyze their own excision from the rRNA coding region. Mutation of the conserved G (G) to an A at the 3 terminus of the 1506 intron of Gonatozygon aculeatum Hastings (Zygnematales) restored self-splicing activity. This mutant intron utilized a new 3 splice site to facilitate autoexcision. We speculate that the 3 terminus of the wild-type 1506 intron may be a target for a ''helper'' factor that facilitates the second step of splicing (exon ligation) in vivo in the Zygnematales. Phylogenetic analyses showed congruence of rDNA and intron trees confirming an ancient origin of the 1506 intron in the common ancestor of the Zygnematales. The rDNA trees were compared to those inferred from rbcL sequence analyses. These trees were in general agreement and showed polyphyly of the Mesotaeniaceae and the Zygnemataceae. The 1506 introns contain significant evolutionary signal and provided strong phylogenetic support for groups within the Zygnematales when analyzed alone or in combination with the SSU rDNA coding regions. The secondary structure of 1506 group I introns was studied to identify RNA elements that may be useful as systematic markers. This analysis showed an optional helix found in RNA domain P2 that was lost in a monophyletic group of Desmidiaceae. This helix is found in all other 1506 group I introns, including those interrupting red algal and fungal SSU rDNAs.

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“…They are also unique amongst the algae in "internalizing" reproduction using a method of exchanging genetic material long known as conjugation (from the Latin verb conju- 2 Conjugatophyceae for AlgaeBase (Guiry and Guiry 2013), it became apparent that there were unresolved problems associated with the nomenclature of the included algae at the class, family and genus level, and in the designation of types for genera (see Table 1 for summary of classification to generic rank). These essentially nomenclatural difficulties have the potential to create taxonomic complications now that molecular taxonomy is being increasingly applied to the conjugating algae (see McCourt et al 2000 and Gontcharov 2008 for reviews, Park et al 1996, Denboh et al 2001, Gontcharov et al 2003, Hall et al 2008, Kim et al 2012.gare, to unite). This highly specialised reproductive feature is clearly a homoplasy otherwise known only in some groups of bacteria (genetic exchange in these bacteria is via a plasmid) and a phylum of fungi (the Zygomycota).…”

mentioning

confidence: 99%

Taxonomy and nomenclature of the Conjugatophyceae (= Zygnematophyceae)

Guiry

2013

ALGAE

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The conjugating algae, an almost exclusively freshwater and extraordinarily diverse group of streptophyte green algae, are referred to a class generally known as the Conjugatophyceae in Central Europe and the Zygnematophyceae elsewhere in the world. Conjugatophyceae is widely considered to be a descriptive name and Zygnematophyceae ('Zygnemophyceae') a typified name. However, both are typified names and Conjugatophyceae Engler ('Conjugatae') is the earlier name. Additionally, Zygnemophyceae Round is currently an invalid name and is validated here as Zygnematophyceae Round ex Guiry. The names of orders, families and genera for conjugating green algae are reviewed. For many years these algae were included in the 'Conjugatae', initially used as the equivalent of an order. The earliest use of the name Zygnematales appears to be by the American phycologist Charles Edwin Bessey , and it was he who first formally redistributed all conjugating algae from the 'Conjugatae' to the orders Zygnematales and the Desmidiales. The family Closteriaceae Bessey, currently encompassing Closterium and Spinoclosterium, is illegitimate as it was superfluous when first proposed, and its legitimization is herein proposed by nomenclatural conservation to facilitate use of the name. The genus Debarya Wittrock, 1872 is shown to be illegitimate as it is a later homonym of Debarya Schulzer, 1866 (Ascomycota), and the substitute genus name Transeauina Guiry is proposed together with appropriate combinations for 13 species currently assigned to the genus Debarya Wittrock. The relationships between Mougeotia, Mougeotiopsis, Mougeotiella, and Transeauina require further resolution, as do many of the other genera referred to the Conjugatophyceae. Type species are designated for genera for which no types were formally selected previously. The number of currently described species of conjugating green algae in AlgaeBase is about 3,500, comprising about 10% of all algal species, with about one third of species referred to the Zygnematales and two-thirds to the Desmidiales. A corresponding 10% of all algal names at the species level and below have been applied to conjugating algae, although a large proportion of these are at the infraspecific level.Key Words: Closteriaceae; Desmidiales; desmids; Transeauina; Zygnematales; Zygnematophyceae new class INTRODUCTIONThe conjugating green algae comprise an almost entirely freshwater group of streptophyte organisms many of extraordinary beauty. Other than the blue-green and red algae, they are unique in possessing no flagellated reproductive bodies and indeed any flagella at all, and they lack centrioles suggesting that any putative flagella were not secondarily lost in the course of evolution. They are also unique amongst the algae in "internalizing" reproduction using a method of exchanging genetic material long known as conjugation (from the Latin verb conju- 2 Conjugatophyceae for AlgaeBase (Guiry and Guiry 2013), it became apparent that there were unresolved problems associated with the nomenclature of ...

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Phylogeny ofGonatozygonandGenicularia(Gonatozygaceae, Desmidiales) based onrbcL sequences

Cited by 15 publications

References 25 publications

MONOPHYLY OF THE GENUS CLOSTERIUM AND THE ORDER DESMIDIALES (CHAROPHYCEAE, CHLOROPHYTA) INFERRED FROM NUCLEAR SMALL SUBUNIT rDNA DATA

MONOPHYLY OF THE GENUS CLOSTERIUM AND THE ORDER DESMIDIALES (CHAROPHYCEAE, CHLOROPHYTA) INFERRED FROM NUCLEAR SMALL SUBUNIT rDNA DATA

EVOLUTIONARY ANALYSES OF SMALL‐SUBUNIT rDNA CODING REGIONS AND THE 1506 GROUP I INTRONS OF THE ZYGNEMATALES (CHAROPHYCEAE, STREPTOPHYTA)

Taxonomy and nomenclature of the Conjugatophyceae (= Zygnematophyceae)

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