Ultrastructure of the flagellar apparatus of the gametes of<i>Gongrosira papuasica</i>(Chlorophyta)

Watanabe, Shin; Chappell, Dorothy F.; Floyd, Gary L.

doi:10.1080/00071619200650041

Cited by 9 publications

(5 citation statements)

References 22 publications

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“…We note with considerable interest that the biflagellated zoospore producing Gongrosira papuasica groups with high bootstrap support within this volvocalean/Chlamydopodium/Chlorococcopsis clade. This nonchaetophoralean placement is consistent with the suggestion made by Watanabe et al (1992) that Gongrosira is possibly related to other chlorophycean algae; that is, they hypothesized a chlorococcalean placement for Gongrosira, and not chaetophoralean based on the ultrastructure of the flagellar apparatus. In the consensus maximum parsimony analysis, the relationship of Gongrosira with other chlorophycean algae is the same.…”

Section: Discussionsupporting

confidence: 88%

ORIGINS AND AFFINITIES OF THE FILAMENTOUS GREEN ALGAL ORDERS CHAETOPHORALES AND OEDOGONIALES BASED ON 18S rRNA GENE SEQUENCES

Booton¹,

Floyd²,

Fuerst

1998

Journal of Phycology

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The order Chaetophorales includes filamentous green algae whose taxonomic relationships to other chlorophycean orders is uncertain. Chaetophoralean taxa include filamentous species which are both branched and unbranched. Ultrastructural studies of zoospores have revealed similar flagellar apparatuses in a number of genera, including Uronema, Stigeoclonium, and Fritschiella, suggesting a close phylogenetic relationship among these taxa. The order Oedogoniales represents a second group of branched and unbranched filamentous green algae whose relationships to other chlorophycean orders also has been unclear. A possible close relationship between the Chaetophorales and Oedogoniales has been suggested. Using DNA sequences from the small-subunit ribosomal RNA gene (SSU rRNA) of several members of each order, we have examined the monophyly of the Chaetophorales and Oedogoniales, as well as the nature of their relationship to other chlorophycean orders. Our results show that chaetophoralean and oedogonialean taxa form separate monophyletic groups. Results also suggest that the two orders are not closely related to each other.

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Section: Discussionsupporting

confidence: 88%

ORIGINS AND AFFINITIES OF THE FILAMENTOUS GREEN ALGAL ORDERS CHAETOPHORALES AND OEDOGONIALES BASED ON 18S rRNA GENE SEQUENCES

Booton¹,

Floyd²,

Fuerst

1998

Journal of Phycology

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“…The two mul-tinucleate, zoosporic CW taxa, Spongiochlm's and Pre tosiphon, are nested within the uninucleate, zoosporic CW taxa. The loosely branched filamentous alga, Gongrosira, is placed with the zoosporic coccoid taxa, in agreement with the study of Watanabe et al (1992).…”

Section: Resultssupporting

confidence: 83%

“…both FA structure and flagellar beating. Subsequent investigation of both Bracteacoccus and Dictyochloris found similarities of all three genera in structure and the plane of the flagellar beat (Watanabe and Floyd 1992). Currently, 18s sequences are being obtained for Dictyochloris fiagrans and for Heterochlamydomonas (Lewis, unpubl.).…”

Section: Resultsmentioning

confidence: 99%

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DIVERSITY AND PHYLOGENETIC PLACEMENT OF BRACTEACOCCUS TEREG (CHLOROPHYCEAE, CHLOROPHYTA) BASED ON 18S RIBOSOMAL RNA GENE SEQUENCE DATA¹

Lewis

1997

Journal of Phycology

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Sequence data from the nuclear small-subunit ribosomal RNA gene was obtained for nine strains of Bracteacoccus Tereg) representing at least Jive morphologzcal species and four distinct geographic locations. These, along with sequence data from two additional chlorophycean taxa, Spongiochloris spongiosa Starr and Ascochloris multinucleata Bold et MacEntee, and 48 published sequences from green algal taxa, were used to determine the phylogenetic placement of Bracteacoccus with respect to other chlorophycean green akae. Results support the monophyb of Bracteacoccus strains, contrasting with patterns o b served so far f m many other coccoid green algae. The range of variation among Bracteacoccus strains is similar to that of other congeners. Basal body orientation in Bracteacoccus has been interpreted as clockwise; however, the 18.5 data point to a relationship between Bracteacoccus and taxa with the directly opposed conJiguration of the flagellar apparatus. No close relationship was found to the multinucleated green coccoids with clockwise orientation of basal bodies, such as Spongiochloris, or to those with parallel basal bodies, such as Spermatozopsis. However, 18s data conJim that the motile and Vegetative cells of Bracteacoccus are structurally distinct from the representatives of sphaeroplealean families currently studied. It is premature to reclasszfy Bracteacoccus until 18s comparisons can be made with additional sphaeroplealean taxa and with algae with similar flagellar structure such as Dictyochloris and Heterochlamydomonas. Key index words: 18s rDNA sequence data; Chlorococcales; flagellar apparatus absolute orientationMolecular studies using sequence data from the nuclear small-subunit ribosomal RNA (rRNA) gene have greatly advanced our understanding of phylogenetic relationships of a variety of green algal groups (Buchheim et al.

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“…The genus Gongrosira Kützing has been placed in the Trentepohliaceae on the basis of vegetative morphological features including the presence of a branched thallus typified by a distinct prostrate and erect portion (Smith 1950) and certain specializations like the incrustation with carbonate seen in some representatives (Fritsch 1935). Watanabe et al (1992) placed the Gongrosira papuasica (Borzi) Tupa, A. among the Chlorococcaceae. On the basis of branched growth forms, cytological features of the cell wall and pyrenoid, and the presence of ovoid zoospores with eyespots, Printz (1964) placed the genus Gongrosira Kützing among the Chaetophorales followed by most of phycologists (Hu & Wei 2006;Wehr et al 2015;Guiry & Guiry 2018).…”

Section: Introductionmentioning

confidence: 99%

Taxonomic transfer of Gongrosira fluminensis Fritsch (Chaetophorales, Chlorophyceae) to Lithotrichon Darienko et Pröschold (Ulvales, Ulvophyceae) based on morphological observation and phylogenetic analyses

Liu¹,

Wang²,

Li³

et al. 2019

Fottea

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One green algal specimen from China was identified as Gongrosira fluminensis Fritsch, due to its unique morphology that pseudoparenchymal basal stratum with rounded or polygonal cells grew into dense little-branched upright threads that reached approximately the same height with specific akinete formation and germination and formed strong cushions without calcification. Examination of the ultrastructural characteristics of plasmodesmata and pyrenoid confirmed that Gongrosira fluminensis Fritsch should be excluded from the order Chaetophorales. The phylogenetic evidence based on DNA sequence data from the nucleus (18S rDNA, ITS rDNA) and chloroplast (tufA) sequences clearly revealed that the Gongrosira fluminensis Fritsch should be classified in the Ulvales (Ulvophyceae) as the new combination species of the genus Lithotrichon Darienko et Pröschold, instead of the Chaetophorales (Chlorophyceae). More specimens in conjunction with natural morphological investigation and molecular analyses are required to reevaluate the microfilamentous genus Gongrosira Kützing and reveal hidden diversities among the Ulvophyceae.

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Ultrastructure of the flagellar apparatus of the gametes ofGongrosira papuasica(Chlorophyta)

Cited by 9 publications

References 22 publications

ORIGINS AND AFFINITIES OF THE FILAMENTOUS GREEN ALGAL ORDERS CHAETOPHORALES AND OEDOGONIALES BASED ON 18S rRNA GENE SEQUENCES

ORIGINS AND AFFINITIES OF THE FILAMENTOUS GREEN ALGAL ORDERS CHAETOPHORALES AND OEDOGONIALES BASED ON 18S rRNA GENE SEQUENCES

DIVERSITY AND PHYLOGENETIC PLACEMENT OF BRACTEACOCCUS TEREG (CHLOROPHYCEAE, CHLOROPHYTA) BASED ON 18S RIBOSOMAL RNA GENE SEQUENCE DATA¹

Taxonomic transfer of Gongrosira fluminensis Fritsch (Chaetophorales, Chlorophyceae) to Lithotrichon Darienko et Pröschold (Ulvales, Ulvophyceae) based on morphological observation and phylogenetic analyses

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Ultrastructure of the flagellar apparatus of the gametes ofGongrosira papuasica(Chlorophyta)

Cited by 9 publications

References 22 publications

ORIGINS AND AFFINITIES OF THE FILAMENTOUS GREEN ALGAL ORDERS CHAETOPHORALES AND OEDOGONIALES BASED ON 18S rRNA GENE SEQUENCES

ORIGINS AND AFFINITIES OF THE FILAMENTOUS GREEN ALGAL ORDERS CHAETOPHORALES AND OEDOGONIALES BASED ON 18S rRNA GENE SEQUENCES

DIVERSITY AND PHYLOGENETIC PLACEMENT OF BRACTEACOCCUS TEREG (CHLOROPHYCEAE, CHLOROPHYTA) BASED ON 18S RIBOSOMAL RNA GENE SEQUENCE DATA1

Taxonomic transfer of Gongrosira fluminensis Fritsch (Chaetophorales, Chlorophyceae) to Lithotrichon Darienko et Pröschold (Ulvales, Ulvophyceae) based on morphological observation and phylogenetic analyses

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DIVERSITY AND PHYLOGENETIC PLACEMENT OF BRACTEACOCCUS TEREG (CHLOROPHYCEAE, CHLOROPHYTA) BASED ON 18S RIBOSOMAL RNA GENE SEQUENCE DATA¹