Browsing by Author "Peters, Akira F."

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    Development of PCR-Based Markers to Determine the Sex of Kelps
    (2015) Lipinska, Agnieszka P.; Ahmed, Sophia; Peters, Akira F.; Faugeron, Sylvain Wielfrid; Cock, J. Mark; Coelho, Susana M.
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    Genetic diversity of Ectocarpus (Ectocarpales, Phaeophyceae) in Peru and northern Chile, the area of origin of the genome-sequenced strain
    (2010) Peters, Akira F.; Mann, Aaron D.; Cordova, Cesar A.; Brodie, Juliet; Correa, Juan A.; Schroeder, Declan C.; Cock, J. Mark
    P>The origin of the Ectocarpus strain used for genome sequencing (the 'genome strain') was Peru, where no Ectocarpus had been reported previously. To study the genetic diversity in the region and to increase the number of individuals from this area available for genetic experiments, 119 new Ectocarpus strains were isolated from eight localities along the 3000 km of coastline from central Peru to central Chile.
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    Parthenogenesis in the brown alga Lessonia nigrescens (Laminariales, Phaeophyceae) from central Chile
    (2007) Oppliger, L. Valeria; Correa, Juan A.; Peters, Akira F.
    Parthenogenesis, the development of female gametes without fertilization, is relatively common in brown algae, although limited quantitative information on the phenomenon is available. Its occurrence is reported for the first time in Lessonia nigrescens Bory, a member of the Laminariales and a key ecological component of the benthic algal communities along the Chilean coast. Isolated female gametophytes developed into parthenosporophytes throughout the year, with a maximum in spring to early summer. Isolated male gametophytes, on the other hand, never developed fronds. Parthenosporophytes obtained in the laboratory developed normally when cultivated under greenhouse conditions, and the resulting individuals were indistinguishable in size, shape, texture, and color from heterozygous sporophytes. Quantification of DNA of various tissues demonstrated that early during their development, parthenosporophytes duplicated their DNA content, displaying levels similar to heterozygous sporophytes and almost twice the level found in gametophytes. One out of 45 individuals from a field population yielded only female gametophytes, strongly suggesting that parthenogenesis does occur in wild stands of L. nigrescens.
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    The Ectocarpus genome and the independent evolution of multicellularity in brown algae
    (2010) Cock, J. Mark; Sterck, Lieven; Rouze, Pierre; Scornet, Delphine; Allen, Andrew E.; Amoutzias, Grigoris; Anthouard, Veronique; Artiguenave, Francois; Aury, Jean-Marc; Badger, Jonathan H.; Beszteri, Bank; Billiau, Kenny; Bonnet, Eric; Bothwell, John H.; Bowler, Chris; Boyen, Catherine; Brownlee, Colin; Carrano, Carl J.; Charrier, Benedicte; Cho, Ga Youn; Coelho, Susana M.; Collen, Jonas; Corre, Erwan; Da Silva, Corinne; Delage, Ludovic; Delaroque, Nicolas; Dittami, Simon M.; Doulbeau, Sylvie; Elias, Marek; Farnham, Garry; Gachon, Claire M. M.; Gschloessl, Bernhard; Heesch, Svenja; Jabbari, Kamel; Jubin, Claire; Kawai, Hiroshi; Kimura, Kei; Kloareg, Bernard; Kuepper, Frithjof C.; Lang, Daniel; Le Bail, Aude; Leblanc, Catherine; Lerouge, Patrice; Lohr, Martin; Lopez, Pascal J.; Martens, Cindy; Maumus, Florian; Michel, Gurvan; Miranda-Saavedra, Diego; Morales, Julia; Moreau, Herve; Motomura, Taizo; Nagasato, Chikako; Napoli, Carolyn A.; Nelson, David R.; Nyvall-Collen, Pi; Peters, Akira F.; Pommier, Cyril; Potin, Philippe; Poulain, Julie; Quesneville, Hadi; Read, Betsy; Rensing, Stefan A.; Ritter, Andres; Rousvoal, Sylvie; Samanta, Manoj; Samson, Gaelle; Schroeder, Declan C.; Segurens, Beatrice; Strittmatter, Martina; Tonon, Thierry; Tregear, James W.; Valentin, Klaus; von Dassow, Peter; Yamagishi, Takahiro; Van de Peer, Yves; Wincker, Patrick
    Brown algae (Phaeophyceae) are complex photosynthetic organisms with a very different evolutionary history to green plants, to which they are only distantly related(1). These seaweeds are the dominant species in rocky coastal ecosystems and they exhibit many interesting adaptations to these, often harsh, environments. Brown algae are also one of only a small number of eukaryotic lineages that have evolved complex multicellularity (Fig. 1). We report the 214 million base pair (Mbp) genome sequence of the filamentous seaweed Ectocarpus siliculosus (Dillwyn) Lyngbye, a model organism for brown algae(2-5), closely related to the kelps(6,7) (Fig. 1). Genome features such as the presence of an extended set of light-harvesting and pigment biosynthesis genes and new metabolic processes such as halide metabolism help explain the ability of this organism to cope with the highly variable tidal environment. The evolution of multicellularity in this lineage is correlated with the presence of a rich array of signal transduction genes. Of particular interest is the presence of a family of receptor kinases, as the independent evolution of related molecules has been linked with the emergence of multicellularity in both the animal and green plant lineages. The Ectocarpus genome sequence represents an important step towards developing this organism as a model species, providing the possibility to combine genomic and genetic(2) approaches to explore these and other(4,5) aspects of brown algal biology further.