Marine cyanobacteria of the genera Prochlorococcus and Synechococcus are important contributors to global primary production occupying a key position at the base of marine food webs. For example, the extracellular viability and intracellular infection kinetics of some cyanophage vary between light and dark conditions. Au cours de cette thèse, j'ai cherché à mieux comprendre les liens entre diversité génétique et adaptation à la niche écologique chez ces deux genres. Learn more: http://scim.ag/2lEoLp6 Although evolutionarily related they are ecologically distinct, with different strategies to harvest, manage and exploit light. En outre Synechococcus synthétise aussi de la zéaxanthine (également trouvée chez le genre proche Prochlorococcus, chez les algues rouges et comme pigments mineurs dans certains Chlorophytes et Eustigmatophytes). Their ecology depends on light, nutrients, and top-down mortality processes, including lysis by viruses. To investigate how nutrient availability affects the temperature sensitivity of phytoplankton growth, we estimated the activation energy (E a) of two dominant picocyanobacteria (Prochlorococcus and Synechococcus) in the subtropical northwest Pacific using short‐term temperature modulated dilution experiments. As a result, the glycogen … strain MIT S9220, which lacks the nitrate utilization genes present in most marine Synechococcus genomes. The cyanobacterial genus Prochlorococcus was isolated about 20 years ago. Current Research. Despite this, a Synechococcus strain was unable to outcompete a Prochlorococcus strain in co‐culture at elevated CO 2. Prochlorococcus is dominant in phytoplankton communities in the central oceanic parts up to a … Prochlorococcus and Synechococcus, which numerically dominate vast oceanic areas, are the two most abundant oxygenic phototrophs on Earth. We incubated Synechococcus and Prochlorococcus under present‐day (380 ppm) or predicted year‐2100 CO 2 levels (750 ppm), and under normal versus elevated temperatures (+4°C) in semicontinuous cultures. Their can cause destructive blooms, producing neurotoxins. We report the nearly complete genome sequence of Synechococcus sp. Synechococcus (from the Greek synechos, in succession, and the Greek kokkos, granule) is a unicellular cyanobacterium that is very widespread in the marine environment.Its size varies from 0.8 to 1.5 µm.The photosynthetic coccoid cells are preferentially found in well–lit surface waters where it can be very abundant (generally 1,000 to 200,000 cells per ml). Synechococcus and Prochlorococcus: A tale of two cyanobacteria Susanne Neuer, Bianca N. Cruz and Francesca DeMartini School of Life Sciences Arizona State University, Tempe, AZ Synechococcus and likelyalsoProchlorococcus embedded in a a phytodetritalaggregate collected with Particle Interceptor Traps at BATS in Spring 2018 at 200m depth (Cruz et al. Isolation of Prochlorococcus strains in pure culture was only recently achieved (Chisholm et al. Here, we present quantitative niche models for these lineages that assess present and future global abundances and distributions. Prochlorococcus and Synechococcus and inorganic forms of nitrogen in sur­ face, along a transect in the equatorial Pacifie between the "warmpool" (West ofthe date line) and high nutrient-Iowchlorophyll (HNLC) waters (from the date line to the Galapagos archipelago). Achetez et téléchargez ebook Bayesian Analysis of Congruence of Core Genes in Prochlorococcus and Synechococcus and Implications on Horizontal Gene Transfer (English Edition): Boutique Kindle - Public Health : Amazon.fr Three unialgal strains of Prochlorococcus and four of Synechococcus were grown in batch culture at low irradiances. Prochlorococcus and Synechococcus, which numerically dominate vast oceanic areas, are the two most abundant oxygenic phototrophs on Earth. The Synechococcus sp. even more, the members of the genus Prochlorococcus experience gene transfer from outside of Prochlorococcus/marine Synechococcus clade, even outside of the cyanobacteria, as can be exemplified by threonyl-tRNA synthetase, which was acquired by Prochlorococcus from gammaproteobacteria (Zhaxybayeva et al. Although they require solar energy for photosynthesis, excess light and associated high UV radiations can induce high levels of oxidative stress that may have deleterious effects on their growth and productivity. Les picocyanobactéries marines Prochlorococcus et Synechococcus sont les organismes photosynthétiques les plus abondants sur la planète et sont présentes dans presque tous les océans. PCC7335 and partakes in an NtcA-regulated cynABDS operon, which is very similar to our observations for Prochlorococcus sp. However, there are few metagenomic studies on a group of photosynthetic algae in the river mouth environment. Synechococcus bacteria are unicellular cyanobacteria that contribute significantly to global marine primary production. Prochlorococcus was dominant from inshore to offshore water and found to be declined gradually. The marine picocyanobacteria Synechococcus and Prochlorococcus numerically dominate open ocean phytoplankton. This study was accomplished by disrupting the glgx gene using an inserstional inactivation technique. Les picocyanobactéries des genres Prochlorococcus et Synechococcus sont les organismes photosynthétiques les plus abondants de l'océan. Leur succès écologique semble être lié à la mise en place de stratégies différentes leur permettant de s'adapter à des niches écologiques distinctes. PCC7002b homolog is most closely related to CynS of Synechococcus sp. marine cyanobacterium Synechococcus sp.WH7803. 10.3389/fmicb.2012.00285. Prochlorococcus is thought to be the most abundant photosynthetic organism---why don't we know more about it? Although they require solar energy for photosynthesis, excess light and associated high UV radiations can induce high levels of oxidative stress that may have deleterious effects on their growth and productivity. The abundance of Synechococcus and Prochlorococcus were determined at twenty-one stations located along the eastern coast of the central and southern Adriatic and at three stations located in the open central Adriatic Sea. PROCHLOROCOCCUS PHOTOSYNTHETIC COMPLEXES Partensky et al. … The Cyanobacteria Prochlorococcus and Synechococcus account for a substantial fraction of marine primary production. Bleached corals also preferentially fed on Synechococcus, nitrogen-rich picophytoplanktonic cells, instead of Prochlorococcus and picoeukaryotes, which have a lower cellular nitrogen content. For pigment analysis by reverse-phase high-pressure liquid chromotography (RP-HPLC), filters were extracted as described in Goericke & Welschmeyer (1993). are cyanobacteria, oxygenic phototrophs that can photolyze either H 2 O or H 2 S. Synechococcus is the main source of primary production in oligotrophic, pelagic marine waters. To complicate the evolutionary histories of Prochlorococcus spp. Accepted 16 August 1995. Prochlorococcus marinus is abundant and widespread throughout the world's oceans and always co-occurs geographically with the marine cyanobacterium Synechococcus. Increased temperature stimulated the cell division rates of Synechococcus but not Prochlorococcus. hal-00815833 ORIGINAL RESEARCH ARTICLE published: 08 August 2012 doi: 10.3389/fmicb.2012.00285 Prochlorococcus and Synechococcus have evolved … Synechococcus elongatus is not yet known to produce any useful compounds or enzymes. strain MED4. Probably, it is the most abundant photosynthetic organism on the planet (Scanlan et al., 2009). Synechococcus and Prochlorococcus dominance estimated by flow cytometry in Tuamotu Atoll lagoons Loïc CHARPY (1) *, Jean BLANCHOT (2) (1) 1RD, COM, Traverse de la Batterie-des-Lions,13007, Marseille, France (2) 1RD, Station biologique de Roscoff, BP 74, 29682 Roscoff, France *Corresponding author (charpy@ird.fr) INTRODUCTION In two coral reef lagoons of the Tuamotu … Synechococcus cells were visualized by their orange phycoerythrin fluorescence under blue-light excitation (450–490 nm), while DAPI stained Prochlorococcus and heterotrophic bacteria cells in xenic cultures were distinguished by their different cell morphologies under UV excitation (380–400 nm), cocci for Prochlorococcus versus bacilli for heterotrophic bacteria. In this study, we have profiled the distribution of Synechococcus collected in the river mouth of Kwangyang … The spectral values of light absorption, scattering and backscattering of intact cells in suspension were determined, together with cell counts, size distribution and pigment composition (via HPLC). Three unialgal strains of Prochlorococcus and four of Synechococcus were grown in batch culture at low irradiances. One current study is the function of the GlgX protein in Synechococcus elongatus PCC 7942. The marine cyanobacteria Prochlorococcus and Synechococcus are dominant in many ocean regions (Flombaum et al., 2013). Assembly also produced the complete genome sequence of a cyanophage present in the MIT S9220 … We grew representative strains of Synechococcus and Prochlorococcus and tracked their susceptibility to photoinactivation of Photosystem II under a … Synechococcus sp. Filters were stored in liquid nitrogen for 1 to 6 mo. Thus, the cyanase gene is involved in lateral gene transfer, suggesting that different CynS may carry out distinct functions in the cyanobacterial cell. By disrupting the glgx gene, GlgX protein was not produced. 2006; Luque et al. Prochlorococcus and Synechococcus have Evolved Different Adaptive Mechanisms to Cope with Light and UV Stress.. Frontiers in microbiology, Frontiers Research Foundation, 2012, 3, pp.285. S-PM2 isanobligatelylyticmyovirus witha genome~196kbinsize, encoding 244ORFs [23].Comparative genomicswith othersequenced marine cyanomyovirusessuggeststhat S-PM2isan“outlier”[15].This isduetothefactthatS-PM2lacks manyofthemarine cya-nophage “nearly-core”genes identified in[15].Ofparticularinterest isthe … Under these conditions, Prochlorococcus ‘ poor response to elevated CO 2 disappeared, and Prochlorococcus’ relative fitness showed negative frequency dependence, with both competitors having significant fitness advantages when initially rare. Both Prochlorococcus and Synechococcus were observed together predominantly in … In particular, photosynthetic cyanobacteria such as Prochlorococcus and Synechococcus were observed in all mesopelagic samples, constituting about 1% of the composition. Author for reprints requests. Prochlorococcus marinus and Synechococcus WH8103 cultures (25 to 75 ml) were collected on 25 mm Whatman GF/F filters using vacuum pressure of <75 mm Hg. Prochlorococcus cyanobacteria grow in diurnal rhythms driven by diel cycles. 1993). in prep.) 1:1 INSIGHT FROM FIELD … Cyanophage, viruses that infect cyanobacteria, are also impacted by light. 1992, r: Received 21 April 1995. Their growth is generally limited however by the concentration of nutrients and trace metals such as iron and phosphorus. 2013 ) and always co-occurs geographically with the marine picocyanobacteria Synechococcus and Prochlorococcus numerically dominate ocean! 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