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Journal of Phycology

Despoina Konstantinou, Eleni Voultsiadou, Emmanuel Panteris, Sevasti-Kiriaki Zervou, Anastasia Hiskia, Spyros Gkelis
Cyanobacterial diversity associated with sponges remains underestimated, though it is of great scientific interest in order to understand the ecology and evolutionary history of the symbiotic relationships between the two groups. Of the filamentous cyanobacteria, the genus Leptolyngbya is the most frequently found in association with sponges as well as the largest and obviously polyphyletic group. In this study, five Leptolyngbya-like sponge-associated isolates were investigated using a combination of molecular, chemical, and morphological approach and revealed a novel marine genus herein designated Leptothoe gen...
April 18, 2019: Journal of Phycology
Juan Manuel González-Olalla, Juan Manuel Medina-Sánchez, Presentación Carrillo
Mixotrophic protists combine phagotrophy and phototrophy within a single cell. Greater phagotrophic activity could reinforce the bypass of carbon (C) flux through the bacteria-mixotroph link and thus lead to a more efficient transfer of C and other nutrients to the top of the trophic web. To determine whether foreseeable changes in temperature and UVR upset the mixotrophic trade-off in favor of one or the other nutritional strategy along the mixotrophic gradient is key to understanding the fate of C and mineral nutrients in the aquatic ecosystem...
April 18, 2019: Journal of Phycology
So Jin Kim, Hae Jin Jeong, Hee Chang Kang, Ji Hyun You, Jin Hee Ok
The dinoflagellate genus Scrippsiella is known to cause red tides. Mortality due to predation should be assessed in order to understand the population dynamics of Scrippsiella species. However, predation has been explored only in a few species. In this study, we examined feeding by common heterotrophic dinoflagellates Oxyrrhis marina, Gyrodinium dominans, Polykrikos kofoidii, Oblea rotunda, and Pfiesteria piscicida, and a ciliate Strombidinopsis sp., on four Scrippsiella species, of similar size, namely S. acuminata, S...
April 15, 2019: Journal of Phycology
Nicole Pereira, Irina N Shilova, Jonathan P Zehr
The marine diazotroph Crocosphaera watsonii provides fixed carbon (C) and nitrogen (N) to open ocean regimes, where nutrient deficiency controls productivity. The growth of Crocosphaera can be limited by low phosphorus (P) concentrations in these oligotrophic environments. Biomarkers such as the high-affinity ABC transporter phosphate-binding gene, pstS, are commonly used to monitor when such organisms are under P stress, however transcriptional regulation of these markers is often complex and not well-understood...
March 31, 2019: Journal of Phycology
Xiaojuan Liu, Jinyan Wen, Weizhou Chen, Hong Du
Algal metabolites are the most promising feedstocks for bio-energy production. Gracilaria lemaneiformis seems to be a good candidate red alga for polysaccharides production, especially relating to the agar production industry. Nitrogen deficiency is an efficient environmental pressure used to increase the accumulation of metabolites in algae. However, there are no studies on the physiological effects of G. lemaneiformis in response to nitrogen deficiency and its subsequent recovery. Here we integrated physiological data with molecular studies to explore the response strategy of G...
March 27, 2019: Journal of Phycology
Elena N Voronova, Ivan V Konyukhov, Olga A Koksharova, Alexandra A Popova, Sergey I Pogosyan, Inessa A Khmel, Andrey B Rubin
Microbial volatiles have a significant impact on the physiological functions of prokaryotic and eukaryotic organisms. Various ketones are present in volatile mixtures produced by plants, bacteria, and fungi. Our earlier results demonstrated the inhibitory effects of soil bacteria volatiles, including ketones, on cyanobacteria. In this work, we thoroughly examined the natural ketones 2-nonanone and 2-undecanone to determine their influence on the photosynthetic activity in Synechococcus sp. PCC 7942. We observed for the first time that the ketones strongly inhibit electron transport through PSII in cyanobacteria cells in vivo...
March 26, 2019: Journal of Phycology
Jeffery R Hughey, Christine A Maggs, Frédéric Mineur, Charlie Jarvis, Kathy Ann Miller, Soha Hamdy Shabaka, Paul W Gabrielson
Current usage of the name Ulva lactuca, the generitype of Ulva, remains uncertain. Genetic analyses were performed on the U. lactuca Linnaean holotype, the U. fasciata epitype, the U. fenestrata holotype, the U. lobata lectotype, and the U. stipitata lectotype. The U. lactuca holotype is nearly identical in rbcL sequence to the U. fasciata epitype, a warm temperate to tropical species, rather than the cold temperate species to which the name U. lactuca has generally been applied. We hypothesize that the holotype specimen of U...
March 25, 2019: Journal of Phycology
Carmen Rojo, Eric Puche, María A Rodrigo
Increases in ultraviolet radiation (UVR), a negative global change factor, affects aquatic primary producers. This effect is expected to be modulated by other global change factors, and to be different for populations adapted to different environments. A common garden experimental approach using freshwater green macroalgae, the cosmopolitan charophyte species Chara hispida and C. vulgaris, allowed us to test whether the beneficial increases in water temperature (T) and nitrate concentration (N), mitigate negative UVR effects...
March 22, 2019: Journal of Phycology
Soo Hyun Im, Tatyana A Klochkova, Da Jeoung Lee, Claire M M Gachon, Gwang Hoon Kim
Disease outbreaks devastate Pyropia aquaculture farms every year. The three most common and serious diseases are Olpidiopsis-blight and red-rot disease caused by oomycete pathogens and green-spot disease caused by the PyroV1 virus. We hypothesized that a basic genetic profile of molecular defenses will be revealed by comparing and analyzing genetic response of Pyropia tenera against the above three pathogens. RNAs isolated from infected thalli were hybridized onto an oligochip containing 15,115 primers designed from P...
March 21, 2019: Journal of Phycology
Heiko Wagner, Christian Jebsen, Christian Wilhelm
Statistical growth rate modelling can be applied in a variety of ecological and biotechnological applications. Such models are frequently based on Monod or Droop equations and, especially for the latter, require reliable determination of model input parameters such as C:N quotas. Besides growth rate modelling, a C:N quota quantification can be useful for monitoring and interpretation of physiological acclimation to abiotic and biotic disturbances (e.g., nutrient limitations). However, as high throughput C:N quota determination is difficult to perform, alternatives need to be established...
March 20, 2019: Journal of Phycology
Agata Pszczółkowska, Wiktor Pszczółkowski, Zdzislawa Romanowska-Duda
Many strains of microalgae are potentially useful for industrial purposes. Microalgal biomass and microalgae-derived substances are becoming valuable products with a widening range of applications including biofuels and human food. In this study, the possibility of using the methane waste from biomass biodigestion in the cultivation of Chlorella vulgaris biomass with simultaneous waste treatment was investigated. The methane waste from biomass biodigestion was obtained from multifunctional facility (Piaszczyna, Poland) producing bioethanol from plant biomass with several steps of reuse of wastes, heat, and carbon dioxide...
March 13, 2019: Journal of Phycology
Dalin Shi, Haizheng Hong, Xi Su, Lirong Liao, Siwei Chang, Wenfang Lin
Although increasing the pCO2 for diatoms will presumably down-regulate the CO2 -concentrating mechanism (CCM) to save energy for growth, different species have been reported to respond differently to ocean acidification (OA). To better understand their growth responses to OA, we acclimated the diatoms Thalassiosira pseudonana, Phaeodactylum tricornutum, and Chaetoceros muelleri to ambient (pCO2 400 μatm, pH 8.1), carbonated (pCO2 800 μatm, pH 8.1), acidified (pCO2 400 μatm, pH 7.8), and OA (pCO2 800 μatm, pH 7...
March 8, 2019: Journal of Phycology
Chunhui Wu, Caiyun Zheng, Gengsheng Ji, Peng Jiang
Besides heat stress, the 70 kDa heat shock proteins (HSP70s) have been proved to respond to cold stress. However, the involved cis-acting elements remained unknown. The hsp70 gene from green macroalga Ulva prolifera (Uphsp70) had been cloned from which one heat shock element HSE and one low temperature responsive element LTR were found in the promoter. Using the established transient expression system and quantitative GUS assay, series of element deletion experiments were performed to determine the functions of HSE and LTR in response to temperature stress...
March 7, 2019: Journal of Phycology
Jan Mareš, Jeffrey R Johansen, Tomáš Hauer, Jan Zima, Stefano Ventura, Oana Cuzman, Bruno Tiribilli, Jan Kaštovský
The systematics of single-celled cyanobacteria represents a major challenge due to morphological convergence and application of various taxonomic concepts. The genus Cyanothece is one of the most problematic cases, as the name has been applied to oval-shaped coccoid cyanobacteria lacking sheaths with little regard to their phylogenetic position and details of morphology and ultrastructure. Hereby we analyze an extensive set of complementary genetic and phenotypic evidence to disentangle the relationships among these cyanobacteria...
March 4, 2019: Journal of Phycology
R Wayne Litaker, Patricia A Tester, Mark W Vandersea
The two most toxic Gambierdiscus species identified from the Caribbean are G. excentricus and G. silvae. These species are primary causes of ciguatera fish poisoning (CFP) and likely contribute disproportionately to the toxicity of marine food webs. While Gambierdiscus species are difficult to distinguish using light or scanning electron microscopy, reliable species-specific molecular identification methods have been developed and used successfully to identify a number of other Gambierdiscus species. Corresponding species-specific assays are not yet available for G...
February 28, 2019: Journal of Phycology
Wanda Kleiven, Geir Johnsen, Murat Van Ardelan
Trace metal or Rare Earth Element (REE) content of marine macroalgae are underexamined and there is a great need for further understanding since macroalgae are used for food and may also be bioindicators of environmental changes. This study, by using High Resolution Inductive Coupled Plasma Spectrometer (HR-ICP-MS) in a clean lab (Class 1000), investigates the trace metal and REE concentrations and composition in the youngest tissue of various species within three algal classes in the Trondheimsfjord, Norway, comprising Phaeo-, Chloro- and Rhodophytes in winter (February) and Spring (May) 2013, with the main focus on Phaeophytes...
February 27, 2019: Journal of Phycology
Fabio Nauer, Carlos Frederico Deluqui Gurgel, Lígia Maria Ayres-Ostrock, Estela Maria Plastino, Mariana Cabral Oliveira
Populations of the marine benthic red macroalgae Hypnea musciformis and H. pseudomusciformis along the Atlantic and Pacific Oceans were tested for phylogeographic structure using the DNA barcode COI-5P combined with rbcL for the construction of the phylogenetic tree. Strong patterns of genetic structure were detected across 210 COI-5P DNA sequences, and 37 COI-5P haplotypes were found, using multiple statistical approaches. Hypnea musciformis was found in the Northeast and Northwest Atlantic, the Mediterrean Sea, Namibia, and along the Pacific coast of Mexico...
February 27, 2019: Journal of Phycology
Ji Woong Lee, Gwang Hoon Kim
Spirogyra filaments show unique photomovement which differs in response to blue, red and far-red light. Phototropins involved in the blue-light movement has been characterized together with downstream signaling components, but the photoreceptors and mechanical effectors of red- and far-red-light movement is not yet characterized. The filaments of S. varians slowly bent and aggregated to form a tangled mass in red light. In far-red light, the filaments unbent, stretched rapidly and separated from each other...
February 25, 2019: Journal of Phycology
Olga Camacho, Cindy Fernández-García, Christophe Vieira, C Frederico D Gurgel, James N Norris, D Wilson Freshwater, Suzanne Fredericq
Lobophora is a common tropical to temperate genus of brown algae found in a plethora of habitats including shallow and deep-water coral reefs, rocky shores, mangroves, seagrass beds and rhodoliths beds. Recent molecular studies have revealed that Lobophora species diversity has been severely underestimated. Current estimates of the species numbers range from 100-140 species with a suggested center of diversity in the Central Indo-Pacific. This study used three molecular markers (cox3, rbcL, psbA), different single-marker species delimitation methods (GMYC, ABGD, PTP), and morphological evidence to evaluate Lobophora species diversity in the Western Atlantic and the Eastern Pacific Oceans...
February 25, 2019: Journal of Phycology
Bhavna Bhardwaj, Akhil Agrawal, Lalita Ledwani, S Thangminlal Vaiphei, Shikha Jain
Cyanobacteria are ancient organisms surviving on the earth due to their simple nutritional requirements and ability to produce distinct secondary metabolites that can combat detrimental environmental impacts. In order to understand these abilities of cyanobacteria at the molecular level, it is necessary to extract high quality genomic DNA. However, the presence of secondary metabolites and exopolysaccharides hinders the DNA extraction from these organisms especially from hypersaline environments. In this paper, we have developed and compared a new method with two known methods of DNA extraction from environmental isolates...
February 25, 2019: Journal of Phycology
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