FLOW CYTOMETRIC ANALYSES OF VIRAL INFECTION IN TWO MARINE PHYTOPLANKTON SPECIES, MICROMONAS PUSILLA (PRASINOPHYCEAE) AND PHAEOCYSTIS POUCHETII (PRYMNESIOPHYCEAE)

1999 ◽  
Vol 35 (5) ◽  
pp. 941-948 ◽  
Author(s):  
Corina P. D. Brussaard ◽  
Runar Thyrhaug ◽  
Dominique Marie ◽  
Gunnar Bratbak
Keyword(s):  
Viral Infection ◽  
Marine Phytoplankton ◽  
Phytoplankton Species ◽  
Flow Cytometric ◽  
Phaeocystis Pouchetii ◽  
Micromonas Pusilla

scholarly journals Neural network analysis of flow cytometric data for 40 marine phytoplankton species

Cytometry ◽  
1994 ◽  
Vol 15 (4) ◽  
pp. 283-293 ◽  
Author(s):  
Lynne Boddy ◽  
C. W. Morris ◽  
M. F. Wilkins ◽  
G. A. Tarran ◽  
P. H. Burkill
Keyword(s):  
Neural Network ◽  
Network Analysis ◽  
Marine Phytoplankton ◽  
Phytoplankton Species ◽  
Neural Network Analysis ◽  
Flow Cytometric Data ◽  
Flow Cytometric

scholarly journals Phenylhydrazone and Quinazoline Derivatives from the Cold-Seep-Derived Fungus Penicillium oxalicum

Marine Drugs ◽  
2020 ◽  
Vol 19 (1) ◽  
pp. 9
Author(s):  
Ya-Ping Liu ◽  
Sheng-Tao Fang ◽  
Zhen-Zhen Shi ◽  
Bin-Gui Wang ◽  
Xiao-Nian Li ◽  
...  
Keyword(s):  
Deep Sea ◽  
Spectroscopic Data ◽  
2D Nmr ◽  
Penicillium Oxalicum ◽  
Marine Phytoplankton ◽  
Cold Seep ◽  
Phytoplankton Species ◽  
X Ray ◽  
X Ray Crystallography ◽  
Quinazoline Derivatives

Three new phenylhydrazones, penoxahydrazones A–C (compounds 1–3), and two new quinazolines, penoxazolones A (compound 4) and B (compound 5), with unique linkages were isolated from the fungus Penicillium oxalicum obtained from the deep sea cold seep. Their structures and relative configurations were assigned by analysis of 1D/2D NMR and mass spectroscopic data, and the absolute configurations of 1, 4, and 5 were established on the basis of X-ray crystallography or ECD calculations. Compound 1 represents the first natural phenylhydrazone-bearing steroid, while compounds 2 and 3 are rarely occurring phenylhydrazone tautomers. Compounds 4 and 5 are enantiomers that feature quinazoline and cinnamic acid units. Some isolates exhibited inhibition of several marine phytoplankton species and marine-derived bacteria.

scholarly journals Cyclonerane Derivatives from the Algicolous Endophytic Fungus Trichoderma asperellum A-YMD-9-2

Marine Drugs ◽  
2019 ◽  
Vol 17 (5) ◽  
pp. 252 ◽  
Author(s):  
Yin-Ping Song ◽  
Feng-Ping Miao ◽  
Xiang-Hong Liu ◽  
Xiu-Li Yin ◽  
Nai-Yun Ji
Keyword(s):  
Endophytic Fungus ◽  
Structural Diversity ◽  
2D Nmr ◽  
Red Alga ◽  
Gracilaria Verrucosa ◽  
Marine Phytoplankton ◽  
Spectroscopic Techniques ◽  
Phytoplankton Species ◽  
Trichoderma Asperellum ◽  
Potent Inhibition

Seven previously unreported cyclonerane derivatives, namely, 3,7,11-trihydroxycycloneran-10-one, cycloneran-3,7,10,11-tetraol, cycloneran-3,7,11-triol, 11,12,15-trinorcycloneran-3,7,10-triol, 7,10S-epoxycycloneran-3,15-diol, 7,10R-epoxycycloneran-3,15-diol, and (10Z)-15-acetoxy-10-cycloneren-3,7-diol, were isolated in addition to the known (10Z)-cyclonerotriol, (10E)-cyclonerotriol, catenioblin C, and chokol E from the culture of Trichoderma asperellum A-YMD-9-2, an endophytic fungus obtained from the marine red alga Gracilaria verrucosa. The structures of previously unreported compounds were established by spectroscopic techniques, including 1D/2D NMR, MS, and IR. The isolation of these new cyclonerane derivatives greatly adds to the structural diversity of unusual cyclonerane sesquiterpenes, and several isolates exhibit potent inhibition against some marine phytoplankton species.

scholarly journals Swift thermal reaction norm evolution in a key marine phytoplankton species

2016 ◽  
Vol 9 (9) ◽  
pp. 1156-1164 ◽  
Author(s):  
Luisa Listmann ◽  
Maxime LeRoch ◽  
Lothar Schlüter ◽  
Mridul K. Thomas ◽  
Thorsten B. H. Reusch
Keyword(s):  
Reaction Norm ◽  
Thermal Reaction ◽  
Marine Phytoplankton ◽  
Phytoplankton Species ◽  
Norm Evolution

scholarly journals Increasing P limitation and viral infection impact lipid remodeling of the picophytoplankter <i>Micromonas pusilla</i>

2016 ◽  
Vol 13 (5) ◽  
pp. 1667-1676 ◽  
Author(s):  
Douwe S. Maat ◽  
Nicole J. Bale ◽  
Ellen C. Hopmans ◽  
Jaap S. Sinninghe Damsté ◽  
Stefan Schouten ◽  
...  
Keyword(s):  
Growth Rate ◽  
Viral Infection ◽  
Lipid Composition ◽  
Lipid Membrane ◽  
Maximum Growth ◽  
P Availability ◽  
Supply Rate ◽  
P Limitation ◽  
Micromonas Pusilla ◽  
P Supply

Abstract. The intact polar lipid (IPL) composition of phytoplankton is plastic and dependent on environmental factors. Previous studies have shown that phytoplankton under low phosphorus (P) availability substitutes phosphatidylglycerols (PGs) with sulfoquinovosyldiacylglycerols (SQDGs) and digalactosyldiacylglycerols (DGDGs). However, these studies focused merely on P depletion, while phytoplankton in the natural environment often experience P limitation whereby the strength depends on the supply rate of the limiting nutrient. Here we report on the IPL composition of axenic cultures of the picophotoeukaryote Micromonas pusilla under different degrees of P limitation, i.e., P-controlled chemostats at 97 and 32 % of the maximum growth rate, and P starvation (obtained by stopping P supply to these chemostats). P-controlled cultures were also grown at elevated partial carbon dioxide pressure (pCO2) to mimic a future scenario of strengthened vertical stratification in combination with ocean acidification. Additionally, we tested the influence of viral infection for this readily infected phytoplankton host species. Results show that both SQDG : PG and DGDG : PG ratios increased with enhanced P limitation. Lipid composition was, however, not affected by enhanced (750 vs. 370 µatm) pCO2. In the P-starved virally infected cells the increase in SQDG : PG and DGDG : PG ratios was lower, whereby the extent depended on the growth rate of the host cultures before infection. The lipid membrane of the virus MpV-08T itself lacked some IPLs (e.g., monogalactosyldiacylglycerols; MGDGs) in comparison with its host. This study demonstrates that, besides P concentration, also the P supply rate, viral infection and even the history of the P supply rate can affect phytoplankton lipid composition (i.e., the non-phospholipid : phospholipid ratio), with possible consequences for the nutritional quality of phytoplankton.

Ecophysiological plasticity in the Arctic phytoplankton species Phaeocystis pouchetii (Prymnesiophyceae, Haptophyta)

2016 ◽  
Vol 151-152 (1) ◽  
pp. 87-102 ◽  
Author(s):  
Sigrid Pfaff ◽  
Lydia Gustavs ◽  
Annett Reichardt ◽  
Rainer Jaskulke ◽  
Hartmut Ewald ◽  
...  
Keyword(s):  
The Arctic ◽  
Phytoplankton Species ◽  
Phaeocystis Pouchetii

scholarly journals Global pattern of phytoplankton diversity driven by temperature and environmental variability

2019 ◽  
Vol 5 (5) ◽  
pp. eaau6253 ◽  
Author(s):  
Damiano Righetti ◽  
Meike Vogt ◽  
Nicolas Gruber ◽  
Achilleas Psomas ◽  
Niklaus E. Zimmermann
Keyword(s):  
Species Richness ◽  
Environmental Variability ◽  
Species Turnover ◽  
Marine Phytoplankton ◽  
Marine Biodiversity ◽  
Phytoplankton Species ◽  
Global Pattern ◽  
Phytoplankton Diversity ◽  
Biogeographic Patterns ◽  
Theoretical Predictions

Despite their importance to ocean productivity, global patterns of marine phytoplankton diversity remain poorly characterized. Although temperature is considered a key driver of general marine biodiversity, its specific role in phytoplankton diversity has remained unclear. We determined monthly phytoplankton species richness by using niche modeling and >540,000 global phytoplankton observations to predict biogeographic patterns of 536 phytoplankton species. Consistent with metabolic theory, phytoplankton richness in the tropics is about three times that in higher latitudes, with temperature being the most important driver. However, below 19°C, richness is lower than expected, with ~8°– 14°C waters (~35° to 60° latitude) showing the greatest divergence from theoretical predictions. Regions of reduced richness are characterized by maximal species turnover and environmental variability, suggesting that the latter reduces species richness directly, or through enhancing competitive exclusion. The nonmonotonic relationship between phytoplankton richness and temperature suggests unanticipated complexity in responses of marine biodiversity to ocean warming.

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