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Richard E. Triemer
Michigan State University
96Publications
24H-index
1,918Citations
Publications 96
Newest
2018 in Scientific ReportsIF: 4.12
Anna Karnkowska4
Estimated H-index: 4
(University of Warsaw),
Matthew S. Bennett11
Estimated H-index: 11
(Michigan State University),
Richard E. Triemer24
Estimated H-index: 24
(Michigan State University)
Photosynthetic euglenids (Euglenophyta) are a monophyletic group of unicellular eukaryotes characterized by the presence of plastids, which arose as the result of the secondary endosymbiosis. Many Euglenophyta plastid (pt) genomes have been characterized recently, but they represented mainly one family – Euglenaceae. Here, we report a comparative analysis of plastid genomes from eight representatives of the family Phacaceae. Newly sequenced plastid genomes share a number of features including sy...
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2017 in PeerJIF: 2.12
Nadja Dabbagh2
Estimated H-index: 2
,
Matthew S. Bennett11
Estimated H-index: 11
(Michigan State University)
+ 1 AuthorsAngelika Preisfeld2
Estimated H-index: 2
3 Citations Download PDF Cite
2017 in Journal of PhycologyIF: 3.00
Bryan Lakey1
Estimated H-index: 1
(Michigan State University),
Richard E. Triemer24
Estimated H-index: 24
(Michigan State University)
The history of euglenoids may have begun as early as ~2 bya. These early phagotrophs ate cyanobacteria, archaea, and eubacteria, and the subsequent appearance of red algae and chromalveolates provided euglenoids with additional food sources. Following the appearance of green algae, euglenoids acquired a chloroplast via a secondary endosymbiotic event with a green algal ancestor. This endosymbiosis also involved a massive transfer of nuclear-encoded genes from the symbiont nucleus to the host. Ex...
3 Citations Source Cite
2017 in Harmful AlgaeIF: 4.14
Paul V. Zimba20
Estimated H-index: 20
(Texas A&M University–Corpus Christi),
I-Shuo Huang3
Estimated H-index: 3
(Texas A&M University–Corpus Christi)
+ 3 AuthorsRichard E. Triemer24
Estimated H-index: 24
(Michigan State University)
Abstract Euglena sanguinea is known to produce the alkaloid toxin euglenophycin and is known to cause fish kills and inhibit mammalian tissue and microalgal culture growth. An analysis of over 30 species of euglenoids for accumulation of euglenophycin identified six additional species producing the toxin; and six of the seven E. sanguinea strains produced the toxin. A phylogenetic assessment of these species confirmed most taxa were in the Euglenaceae, whereas synthesis capability apparently has...
4 Citations Source Cite
2017 in Journal of PhycologyIF: 3.00
Matthew S. Bennett11
Estimated H-index: 11
(Michigan State University),
Shin Han Shiu18
Estimated H-index: 18
(Michigan State University),
Richard E. Triemer24
Estimated H-index: 24
(Michigan State University)
3 Citations Source Cite
Chelsea M. Markunas1
Estimated H-index: 1
(Michigan State University),
Richard E. Triemer24
Estimated H-index: 24
(Michigan State University)
Euglenids are an ancient lineage that may have existed as early as 2 billion years ago. A mere 65 years ago, Melvin Calvin and Andrew A. Benson performed experiments on Euglena gracilis and elucidated the series of reactions by which carbon was fixed and reduced during photosynthesis. However, the evolutionary history of this pathway (Calvin-Benson cycle) in euglenids was more complex than Calvin and Benson could have imagined. The chloroplast present today in euglenophytes arose from a secondar...
6 Citations Source Cite
2015
Richard E. Triemer24
Estimated H-index: 24
(Michigan State University),
Bożena Zakryś10
Estimated H-index: 10
(University of Warsaw)
Euglenoids form a diverse group of eukaryotic organisms that may have arisen a billion years or more before the origins of plants and animals. They are largely unicellular flagellates with only one genus, and they form colonies. There are nearly 2,900 nominal species for the major photosynthetic taxa, but, of these, only about 800 are accepted as taxonomically valid. Modern phylogenetics has caused numerous changes in euglenoid taxonomy, which keeps the number of accepted species in constant tra...
1 Citations Source Cite
Matthew S. Bennett11
Estimated H-index: 11
(Michigan State University),
Richard E. Triemer24
Estimated H-index: 24
(Michigan State University)
Over the last few years multiple studies have been published outlining chloroplast genomes that represent many of the photosynthetic euglenid genera. However, these genomes were scattered throughout the euglenophyceaean phylogenetic tree, and focused on comparisons with Euglena gracilis. Here, we present a study exclusively on taxa within the Euglenaceae. Six new chloroplast genomes were characterized, those of Cryptoglena skujai, E. gracilis var. bacillaris, Euglena viridis, Euglenaria anabaena...
22 Citations Source Cite
Anna Karnkowska4
Estimated H-index: 4
(University of Warsaw),
Matthew S. Bennett11
Estimated H-index: 11
(Michigan State University)
+ 3 AuthorsRichard E. Triemer24
Estimated H-index: 24
(Michigan State University)
Photosynthetic euglenids acquired chloroplasts by secondary endosymbiosis, which resulted in changes to their mode of nutrition and affected the evolution of their morphological characters. Mapping morphological characters onto a reliable molecular tree could elucidate major trends of those changes. We analyzed nucleotide sequence data from regions of three nuclear-encoded genes (nSSU, nLSU, hsp90), one chloroplast-encoded gene (cpSSU) and one nuclear-encoded chloroplast gene (psbO) to estimate ...
15 Citations Source Cite
2014 in PhycologiaIF: 1.80
Matthew S. Bennett11
Estimated H-index: 11
(Michigan State University),
Krystle E. Wiegert4
Estimated H-index: 4
(Michigan State University),
Richard E. Triemer24
Estimated H-index: 24
Euglena proxima is a common, globally dispersed, and easily identified photosynthetic euglenoid. Previous phylogenetic analyses using nuclear-encoded small subunit (SSU) and large subunit (LSU) rRNA genes revealed that this taxon was paraphyletic with other Euglena species and was positioned as sister to all Euglenaceae. Despite this, authors were reluctant to remove this taxon from Euglena until additional data, or taxa pairing with E. proxima, were obtained because it created a monotypic genus...
20 Citations Source Cite
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