Abstract:
:In batch cultures of four Mediterranean strains (from France, Italy, and Spain) of Alexandrium catenella (Whedon et Kof.) Balech growing on a daily light cycle, ammonium and urea uptake were estimated by the (15) N tracer technique. Ammonium uptake could be described by Michaelis-Menten kinetics along a substrate gradient of 0.1-10 μgat N · L(-1) for the four strains, while two different patterns were observed for urea uptake with Michaelis-Menten kinetics for one strain and linear kinetics for the others. In all cases, an increase in uptake rates with time was noted over the daylight period. This trend led to a net increase in the maximum uptake rate (Vmax ; for saturable kinetics) and in the initial slope α. For ammonium, Vmax increased by a factor of 2-10 depending on the strain, and, for urea, the maximal uptake rates measured increased by a factor of 2-18. Temporal variations of half-saturation constants (Ks ) for both nutrients did not show a clear trend. Increases in Vmax and α showed an acclimation of the cells' uptake system over time to a N pulse, which may be explained by the light periodicity. For two strains, extensive ammonium release was observed during urea assimilation. This mechanism removes urea from the medium, so it is no longer available to other potential competitors, but supplies N back to the medium in the form of ammonium. From a methodological point of view, the phenomenon leads to considerable underestimates of the contribution of urea to phytoplankton growth.
journal_name
J Phycoljournal_title
Journal of phycologyauthors
Jauzein C,Collos Y,Garcés E,Vila M,Maso Mdoi
10.1111/j.1529-8817.2008.00570.xsubject
Has Abstractpub_date
2008-10-01 00:00:00pages
1136-45issue
5eissn
0022-3646issn
1529-8817journal_volume
44pub_type
杂志文章abstract::Following exposure to long-wavelength ultraviolet radiation (UVA), some cyanobacteria produce the indole-alkaloid sunscreen scytonemin. The genomic region associated with scytonemin biosynthesis in the cyanobacterium Nostoc punctiforme includes 18 cotranscribed genes. A two-component regulatory system (Npun_F1277/Npun...
journal_title:Journal of phycology
pub_type: 杂志文章
doi:10.1111/jpy.12414
更新日期:2016-08-01 00:00:00
abstract::An adverse consequence of applying morphology-based taxonomic systems to catalog cyanobacteria, which generally are limited in the number of available morphological characters, is a fundamental underestimation of natural biodiversity. In this study, we further dissect the polyphyletic cyanobacterial genus Lyngbya and ...
journal_title:Journal of phycology
pub_type: 杂志文章
doi:10.1111/jpy.12115
更新日期:2013-12-01 00:00:00
abstract::Sargassum muticum (Yendo) Fensholt is an invasive species that is firmly established on intertidal and subtidal rocky shores of Europe and the Pacific coast of North America. Local success and spread of S. muticum is thought to rely on its reproductive potential that seems dependent on exogenous factors like tidal and...
journal_title:Journal of phycology
pub_type: 杂志文章
doi:10.1111/j.1529-8817.2008.00619.x
更新日期:2009-02-01 00:00:00
abstract::We studied cupric glutamate as a novel algicide for marine harmful algae and hexadecyltrimethyleamine bromide (HDTMAB) as an accelerant. Cupric glutamate had an excellent ability to inhibit the growth of Alexandrium sp. LC3, but the inhibition efficiency did not increase with higher cupric glutamate concentration. The...
journal_title:Journal of phycology
pub_type: 杂志文章
doi:10.1111/j.1529-8817.2008.00591.x
更新日期:2008-12-01 00:00:00
abstract::The study of the microalgal growth kinetics is an indispensable tool in all fields of phycology. Knowing the optimal nutrient concentration is an important issue that will help to develop efficient growth systems for these microorganisms. Although nitrogen and phosphorus are well studied for this purpose, sulfur seems...
journal_title:Journal of phycology
pub_type: 杂志文章
doi:10.1111/jpy.12367
更新日期:2016-02-01 00:00:00
abstract::Harmful cyanobacterial blooms (CyanoHABs) are a rapidly proliferating global problem, threatening the use and sustainability of our freshwater resources. In recent decades, the United States, China, and other developed and developing countries threatened by CyanoHAB expansion have established collaborative efforts aim...
journal_title:Journal of phycology
pub_type: 杂志文章
doi:10.1111/jpy.13058
更新日期:2020-12-01 00:00:00
abstract::Symbiodinium reside intracellularly in a complex symbiosome (host and symbiont-derived) within cnidarian hosts in a specific host-symbiont association. Symbiodinium is a diverse genus with variation greater than other dinoflagellate orders. In this paper, our investigation into specificity examines antigenic variation...
journal_title:Journal of phycology
pub_type: 杂志文章
doi:10.1111/jpy.12215
更新日期:2014-10-01 00:00:00
abstract::The molecular structure of the carotenoid lactoside P457, (3S,5R,6R,3'S,5'R,6'S)-13'-cis-5,6-epoxy-3',5'-dihydroxy-3-(β-d-galactosyl-(1→4)-β-d-glucosyl)oxy-6',7'-didehydro-5,6,7,8,5',6'-hexahydro-β,β-caroten-20-al, was confirmed by spectroscopic methods using Symbiodinium sp. strain NBRC 104787 cells isolated from a s...
journal_title:Journal of phycology
pub_type: 杂志文章
doi:10.1111/j.1529-8817.2012.01219.x
更新日期:2012-12-01 00:00:00
abstract::The broadly defined genus Chaetophora consisted of species with minute, uniseriate branching filaments enveloped in soft or firm mucilage forming macroscopic growths that are spherical, hemispherical, and tubercular or arbuscular, growing epiphytically on freshwater aquatic plants and other submerged surfaces in stand...
journal_title:Journal of phycology
pub_type: 杂志文章
doi:10.1111/jpy.12803
更新日期:2019-02-01 00:00:00
abstract::Brown tides of the marine pelagophyte Aureococcus anophagefferens Hargraves et Sieburth have been investigated extensively for the past two decades. Its growth is fueled by a variety of nitrogen (N) compounds, with dissolved organic nitrogen (DON) being particularly important during blooms. Characterization of a cDNA ...
journal_title:Journal of phycology
pub_type: 杂志文章
doi:10.1111/j.1529-8817.2008.00571.x
更新日期:2008-10-01 00:00:00
abstract::Characeae (Charophyceae, Charophyta) contains two tribes with six genera: tribe Chareae with four genera and tribe Nitelleae, which includes Tolypella and Nitella. This paper uses molecular and morphological data to elucidate the phylogeny of Tolypella species in North America. In the most comprehensive taxonomic trea...
journal_title:Journal of phycology
pub_type: 杂志文章
doi:10.1111/jpy.12229
更新日期:2014-10-01 00:00:00
abstract::Twenty years ago an Arctic cryptophyte was isolated from Baffin Bay and given strain number CCMP2045. Here, it was described using morphology, water- and non-water soluble pigments and nuclear-encoded SSU rDNA. The influence of temperature, salinity, and light intensity on growth rates was also examined. Microscopy re...
journal_title:Journal of phycology
pub_type: 杂志文章
doi:10.1111/jpy.12766
更新日期:2018-10-01 00:00:00
abstract::Germination tests were conducted on 39 collections of Chara oospores stored under 4 different conditions for periods of approximately 4 yr. In general, storage of dried oospores at low temperatures (3 C) provided the most satisfactory means for long-term preservation of viable disseminules. Oospore germination zuas hi...
journal_title:Journal of phycology
pub_type: 杂志文章
doi:10.1111/j.1529-8817.1967.tb04638.x
更新日期:1967-06-01 00:00:00
abstract::Phospholipase D (PLD) participates in the formation of phosphatidic acid, a precursor in glycerolipid biosynthesis and a second messenger. PLDs are part of a superfamily of proteins that hydrolyze phosphodiesters and share a catalytic motif, HxKxxxxD, and hence a mechanism of action. Although HKD-PLDs have been thorou...
journal_title:Journal of phycology
pub_type: 杂志文章
doi:10.1111/jpy.12334
更新日期:2015-10-01 00:00:00
abstract::Members of the morphologically unusual cyanobacterial family Gomontiellaceae were studied using a polyphasic approach. Cultured strains of Hormoscilla pringsheimii, Starria zimbabweënsis, Crinalium magnum, and Crinalium epipsammum were thoroughly examined, and the type specimen of the family, Gomontiella subtubulosa, ...
journal_title:Journal of phycology
pub_type: 杂志文章
doi:10.1111/jpy.12354
更新日期:2015-12-01 00:00:00
abstract::Photosynthetic dinoflagellates are ecologically and biogeochemically important in marine and freshwater environments. However, surprisingly little is known of how this group acquires inorganic carbon or how these diverse processes evolved. Consequently, how CO2 availability ultimately influences the success of dinofla...
journal_title:Journal of phycology
pub_type: 杂志文章,评审
doi:10.1111/jpy.13050
更新日期:2020-07-11 00:00:00
abstract::In this study, we highlight the effects of methyl jasmonate (MeJa) on cystocarp development in the red macroscopic alga Grateloupia imbricata. In G. imbricata, jasmonate release is related to the reproductive state, as fertile thalli (i.e., those that have cystocarps) released significant amounts of this volatile comp...
journal_title:Journal of phycology
pub_type: 杂志文章
doi:10.1111/jpy.12467
更新日期:2016-12-01 00:00:00
abstract::The formation of archeospores is characteristic of Porphyra yezoensis Ueda and is important for Porphyra aquaculture. Recently, it has been regarded as a valuable seed source for propagation of thalli in mariculture. Cell wall composition changes are associated with archeospore formation in P. yezoensis. Here, we repo...
journal_title:Journal of phycology
pub_type: 杂志文章
doi:10.1111/j.1529-8817.2011.01003.x
更新日期:2011-08-01 00:00:00
abstract::Dissolved organic carbon (DOC) released by macroalgae is important in the context of coral reef degradation as it contributes to coral mortality by promoting bacterial metabolism on the coral surface. Using experimental carbon dioxide (CO2 ) manipulations in outdoor flow-through tanks, we found that seawater CO2 enric...
journal_title:Journal of phycology
pub_type: 杂志文章
doi:10.1111/jpy.13002
更新日期:2020-08-01 00:00:00
abstract::Two new gynandrosporous species of Oedocladium from the United States were isolated into unialgal culture and comparative studies were made. The new taxa described, O. carolinianum sp. nov. and O. cir-ratum sp. nov., are morphologically very similar. Both species have an opercufate oogonium with inferior division, oos...
journal_title:Journal of phycology
pub_type: 杂志文章
doi:10.1111/j.1529-8817.1968.tb04719.x
更新日期:1968-09-01 00:00:00
abstract::Light has been identified as one of the main factors affecting seaweed ecophysiology. We investigated the dependence of nutrient metabolism on sun and shade light conditions and whether episodes of upwelling of nutrient-rich subsuperficial water could reduce the summer nutrient limitation driving physiological changes...
journal_title:Journal of phycology
pub_type: 杂志文章
doi:10.1111/j.1529-8817.2007.00440.x
更新日期:2008-02-01 00:00:00
abstract::Most mitochondrial genomes in the green algal phylum Chlorophyta are AT-rich, circular-mapping DNA molecules. However, mitochondrial genomes from the Reinhardtii clade of the Chlorophyceae lineage are linear and sometimes fragmented into subgenomic forms. Moreover, Polytomella capuana, from the Reinhardtii clade, has ...
journal_title:Journal of phycology
pub_type: 杂志文章
doi:10.1111/j.1529-8817.2009.00753.x
更新日期:2009-12-01 00:00:00
abstract::d-Mannose and related derivatives, e.g., d-glucosa-mine and 2-deoxy- journal_title:Journal of phycology pub_type: 杂志文章 doi:10.1111/j.1529-8817.1968.tb04688.x 更新日期:1968-06-01 00:00:00
abstract::Polytomella is a genus of colorless green algae in the Reinhardtinia clade of the Chlamydomonadales, which has proven useful for a broad range of studies particularly those exploring the evolutionary loss of photosynthesis and mitochondrial genomics/biochemistry. Although 13 Polytomella strain accessions are currently...
journal_title:Journal of phycology
pub_type: 杂志文章
doi:10.1111/jpy.12430
更新日期:2016-08-01 00:00:00
abstract::Large-scale seaweed cultivation has been instrumental in globalizing the seaweed industry since the 1950s. The domestication of seaweed cultivars (begun in the 1940s) ended the reliance on natural cycles of raw material availability for some species, with efforts driven by consumer demands that far exceeded the availa...
journal_title:Journal of phycology
pub_type: 杂志文章,评审
doi:10.1111/jpy.12326
更新日期:2015-10-01 00:00:00
abstract::Macroalgal bloom-forming species occur in coastal systems worldwide. However, due to overlapping morphologies in some taxa, accurate taxonomic assessment and classification of these species can be quite challenging. We investigated the molecular and morphological characteristics of 153 specimens of bloom-forming Ulva ...
journal_title:Journal of phycology
pub_type: 杂志文章
doi:10.1111/jpy.12108
更新日期:2013-10-01 00:00:00
abstract::The publication of a mini-review by Olivier De Clerck et al. in this issue of the Journal of Phycology presented an opportunity to open a dialogue on challenges faced by contemporary algal taxonomists. The Editorial Office solicited the following two additional contributions in response to De Clerck et al.'s paper; th...
journal_title:Journal of phycology
pub_type: 信件
doi:10.1111/jpy.12041
更新日期:2013-04-01 00:00:00
abstract::The diatom Cyclotella meneghiniana Kütz. (SAG 1020-a) was cultured under high-light (HL) and low-light (LL) conditions with either high (12 μM) or low (1 μM) iron in the media. Changes in cell morphology, especially cell volume and chloroplast size, were observed in cells grown under low iron. In contrast, HL had a mu...
journal_title:Journal of phycology
pub_type: 杂志文章
doi:10.1111/j.1529-8817.2011.01060.x
更新日期:2011-12-01 00:00:00
abstract::The quantitative characterization of the ecology of individual phytoplankton taxa is essential for model resolution of many aspects of aquatic ecosystems. Existing literature cannot directly parameterize all phytoplankton taxa of interest, as many traits and taxa have not been sampled. However, valuable clues on the v...
journal_title:Journal of phycology
pub_type: 杂志文章
doi:10.1111/j.1529-8817.2010.00946.x
更新日期:2011-02-01 00:00:00
abstract::The ultrastructural changes which occurred during senescence in the stationary phase of growth of the unicellular green alga Spongiochloris typica were observed. The cell wall consists of a membrane like primary wall and an inner secondary wall which becomes progressively thickened with age of the culture. During sene...
journal_title:Journal of phycology
pub_type: 杂志文章
doi:10.1111/j.1529-8817.1968.tb04696.x
更新日期:1968-12-01 00:00:00