Multiple evolutionary origins of prochlorophytes within the cyanobacterial radiation

@article{Urbach1992MultipleEO,
  title={Multiple evolutionary origins of prochlorophytes within the cyanobacterial radiation},
  author={Ena Urbach and Deborah L. Robertson and Sallie W. Chisholm},
  journal={Nature},
  year={1992},
  volume={355},
  pages={267-270}
}
THE taxonomic group Prochlorales (Lewin 1977) Burger-Wiersma, Stal and Mur 1989 was established to accommodate a set of prokaryotic oxygenic phototrophs which, like plant, green algal and euglenoid chloroplasts, contain chlorophyll b instead of phycobiliproteins. Prochlorophytes were originally proposed (with concomitant scepticism1–3) to be a monophyletic group sharing a common ancestry with these 'green' chloroplasts4–6. Results from molecular sequence phytogenies, however, have suggested… 
Multiple evolutionary origins of prochlorophytes, the chlorophyllb-containing prokaryotes
TLDR
Molecular sequence data indicate that the known prochlorophyte lineages do not include the direct ancestor of chloroplasts, and are shown to be a highly diverged polyphyletic group, and the use of chlorophyll b as a light-harvesting pigment has developed independently several times in evolution.
Prochlorophyte Evolution and the Origin of Chloroplasts: Morphological and Molecular Evidence
TLDR
Current evidence from both kinds of investigations is summarized, to reconcile the morphological and molecular sequence data with a coherent picture of prochlorophyte and chloroplast evolution.
Prochlorophytes: The ‘Other’ Cyanobacteria?
TLDR
Given the identification of a number of distinctive differences in the organization of the photosynthetic apparatus in these two types of procaryotes performing oxygenic photosynthesis it would be appropriate to support and extend the suggestion of Gibbons and Murray (1978) and Florenzano et al. (1986) to institute two orders—i.e., Cyanobacteria and Oxychlorobacteria—within the class of the Oxyphotobacteria.
Phycobiliprotein genes of the marine photosynthetic prokaryote Prochlorococcus: evidence for rapid evolution of genetic heterogeneity.
TLDR
Differences in phycoerythrin gene sequences between Prochlorococcus and Synechococcus appear to be consistent with a model of elevated mutation rates rather than relaxed selection, which suggests that although phycobiliproteins is not a major constituent of the light-harvesting apparatus in Pro chlorococcus, the cpeB and cpeA genes are still under selection, albeit a different type of selection than in SyneChococcus.
A molecular test of cyanobacterial phylogeny: inferences from constraint analyses
TLDR
It is recommended that Prochlorales be reclassified as cyanobacteria and Chroococcales be redefined to exclude the genus Microcystis, and that a new order be erected for Micro Cystis.
Host specificity and phylogeography of the prochlorophyte Prochloron sp., an obligate symbiont in didemnid ascidians.
TLDR
The genetic diversity of the genus Prochloron is investigated by constructing a phylogenetic tree based on the 16S rRNA gene sequences of 27 isolates from 11 species of didemnid ascidians collected from Japan, Australia and the USA, and implications for the evolutionary relationship of prochlorophytes, cyanobacteria and chloroplasts are discussed.
Validation of Prochloron didemni (Cyanophyta) and nomenclatural discussion of correlated names at the higher ranks
TLDR
Molecular results on the basis of RNA Tl-generated oligonucleotide catalogues of 16S rRNA sequences show that, phylogenetically, Prochloron is a member of the blue-green algal (cyanobacterial) radiation.
Cyanobacteria of the Genus Prochlorothrix†
TLDR
The evolutionary scenario for green cyanobacteria is suggested taking into account their possible role in the origin of simple chloroplast and the growing evidence for naturally occurring Prochlorothrix.
The prochlorophytes: are they more than just chlorophyll a/b-containing cyanobacteria?
TLDR
It is proposed that the structure of the light-harvesting complexes (LHC) from prochlorophytes is very different from those of chloroplast systems, and is evolutionarily very ancient.
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 24 REFERENCES
Multiple evolutionary origins of prochlorophytes, the chlorophyllb-containing prokaryotes
TLDR
Molecular sequence data indicate that the known prochlorophyte lineages do not include the direct ancestor of chloroplasts, and are shown to be a highly diverged polyphyletic group, and the use of chlorophyll b as a light-harvesting pigment has developed independently several times in evolution.
The relationship of a prochlorophyte Prochlorothrix hollandicato green chloroplasts
TLDR
A 16S rRNA-based phylogenetic analysis of P. hollandica is reported, finding the organism to fall within the cyanobacterial line of descent, as do the green chloroplasts, but it is not a specific relative of greenchloroplasts.
psbA genes indicate common ancestry of prochlorophytes and chloroplasts
TLDR
Overall pigment composition and thylakoid membrane structure of P. hollandica suggest it has intermediate characteristics between cyanobacteria and the chloroplasts of higher plants, and this hypothesis is supported by phylogenetic analysis of derived Dl amino-acid sequences from psbA genes of thirteen taxa on the basis of parsimony.
Evolutionary relationships among cyanobacteria and green chloroplasts
TLDR
The results indicate that many diverse forms of cyanobacteria diverged within a short span of evolutionary distance and suggest that the chloroplast lineage, which includes the cyanelle of C. paradoxa, is not just a sister group to the free-living forms but rather is contained within the cyanobacterial radiation.
A novel free-living prochlorophyte abundant in the oceanic euphotic zone
The recent discovery of photosynthetic picoplankton has changed our understanding of marine food webs1. Both prokaryotic2,3 and eukaryotic4,5 species occur in most of the world's oceans and account
PROCHLORON AND THE THEORY OF SYMBIOGENESIS *
  • R. Lewin
  • Environmental Science, Biology
    Annals of the New York Academy of Sciences
  • 1981
TLDR
Although some people still regard them as aberrant blue-green algael or as (even more aberrant) green photosynthetic bacteria, it is generally inclined to consider them as representing a separate algal division, the Prochlorophyta, with so far only a single genus, Prochloron.
Prochlorthrix hollandica gen. nov. sp. nov., a Filamentous Oxygenic Photoautotrophic Procaryote Containing Chlorophylls a and b: Assignment to Prochlorotrichaceae fam. nov. and Order Prochlorales Florenzano, Balloni, and Materassi 1986, with Emendation of the Ordinal Description
TLDR
Emendation of the description of the order Prochlorales Florenzano, Balloni, and Materassi 1986 is proposed since the original definition of this taxon would exclude the genus Prochlorothrix, and the family Prochlorotrichaceae fam.
Genetic diversity in Sargasso Sea bacterioplankton
TLDR
The phylogenetically analysed clone libraries of eubacterial 16S ribosomal RNA genes amplified from natural populations of Sargasso Sea picoplankton indicate the presence of a novel microbial group, the SAR 11 cluster, which appears to be a significant component of this oligotrophic bacterioplankton community.
Phylogenetic analysis of a natural marine bacterioplankton population by rRNA gene cloning and sequencing
TLDR
The data confirm the earlier conclusion that a majority of planktonic bacteria are new species previously unrecognized by bacteriologists.
Mitochondrial origins.
The 16S ribosomal RNA sequences from Agrobacterium tumefaciens and Pseudomonas testosteroni have been determined to further delimit the origin of the endosymbiont that gave rise to the mitochondrion.
...
1
2
3
...