Journal of Phycology

Cover image for Vol. 53 Issue 3

Edited By: Debashish Bhattacharya, Michael Graham, Arthur Grossman, Jonathan Zehr

Impact Factor: 2.608

ISI Journal Citation Reports © Ranking: 2016: 19/105 (Marine & Freshwater Biology); 52/211 (Plant Sciences)

Online ISSN: 1529-8817

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  • Integration of chlorophyll a fluorescence and photorespirometry techniques to understand production dynamics in macroaglal communities

    Integration of chlorophyll a fluorescence and photorespirometry techniques to understand production dynamics in macroaglal communities

    Association between the light dependent reaction of photosynthesis and methods of measuring photophysiological processes. Variable chlorophyll-a fluorescence as measured by PAM fluorometry (1) is an instantaneous measure of light fluorescence associated with the excitation state of photosystem II (PSII). Photorespirometry measures the oxygen evolution (2) from the splitting of water into O2, electrons and protons by the oxygen evolving complex associated with PSII, but must be time integrated to account for the passive diffusion of O2 across cellular membranes, as O2 measurements occurs extracellularly during which it is offset by oxygen consumption through respiration and photorespiration. Base image from “Light dependent reactions of photosynthesis in the thylakoid membrane of plant cells” by Somepics CC BY-SA 4.0 / modified with the addition of diving PAM fluorometer (Walz©) and photorespirometer.

  • Molecular phylogeny and taxonomic revision of the genus Wittrockiella (Pithophoraceae, Cladophorales), including the descriptions of W. australis sp. nov. and W. zosterae sp. nov.

    Molecular phylogeny and taxonomic revision of the genus Wittrockiella (Pithophoraceae, Cladophorales), including the descriptions of W. australis sp. nov. and W. zosterae sp. nov.

    Bayesian Inference (BI) phylogram of the genus Wittrockiella (Pithophoraceae) inferred from rDNA sequences of the small subunit (SSU), partial large subunit (LSU), and the 5.8S region that separates the internally transcribed spacers. Posterior probabilities from BI are indicated above the branches, Maximum Likelihood bootstrap values (1,000 replicates) are indicated below. For the BI analysis, the alignment was partitioned into three markers, the ML analysis was run without partitioning. The tree was rooted with Pseudocladophora conchospheria (Pseudocladophoraceae). The positions of Wittrockiella australis sp. nov. and W. zosterae sp. nov. are highlighted in bold. The scale bar represents substitutions per site.

  • Timing of the evolutionary history of Corallinaceae (Corallinales, Rhodophyta)

    Timing of the evolutionary history of Corallinaceae (Corallinales, Rhodophyta)

    Porolithoideae. (A) Light-microscope image of thin slide of fossil sample of oldest member of Porolithoideae; arrow shows horizontal row of trichocytes, (B) SEM image of cross-section of extant Porolithon onkodes GDA61359. [Color figure can be viewed at wileyonlinelibrary.com]

  • Diatom life cycles and ecology in the Cretaceous

    Diatom life cycles and ecology in the Cretaceous

    The Late Cretaceous Trinacria anissimowii (a) apex to apex size distribution (n = 244) and (b) diagrammatic representation of the life cycle.

  • The function of the ocelloid and piston in the dinoflagellate Erythropsidinium (Gymnodiniales, Dinophyceae)

    The function of the ocelloid and piston in the dinoflagellate Erythropsidinium (Gymnodiniales, Dinophyceae)

    Time-lapse sequence of the piston activity of Erythropsidinium. (a) Phases of extension and retraction during the “static mode” recorded at 1,500 fps. Only one each five consecutive frames is illustrated. The interval between two micrographs is 3.33 ms (See Fig. S4 for the complete sequence). (b) Several phases of extension and retraction during the “locomotion mode” recorded at 60 fps. The interval between two micrographs is 16.66 ms (See Fig. S5 for the complete sequence). The lateral size scale corresponds to the stage micrometer with divisions each 10 μm. [Color figure can be viewed at wileyonlinelibrary.com]

  • Biomineralization of calcium carbonate in the cell wall of Lithothamnion crispatum (Hapalidiales, Rhodophyta): correlation between the organic matrix and the mineral phase

    Biomineralization of calcium carbonate in the cell wall of Lithothamnion crispatum (Hapalidiales, Rhodophyta): correlation between the organic matrix and the mineral phase

    Morphological analysis of Lithothamnion crispatum rhodolith in different length scales. (A) General aspects of a L. crispatum rhodolith obtained using a stereoscope. (B) SEM low magnification image showing a fracture surface transverse to L. crispatum thallus. (C) SEM image of a fractured sample showing crystals oriented perpendicularly to the cell surface (white arrows) and crystals oriented tangentially to it in the interstitial zone (dotted rectangle). (D) Conventional transmission electron microscopy (CTEM) image of an ultrathin section of L. crispatum showing the arrangement of crystals in adjacent cell walls. Crystals from each cell wall are elongated radially, while crystals from the interstitial zone (dotted rectangles) are elongated tangentially to the cell surface. Note that in some areas, the crystals diffract similarly (e.g., contiguous dark regions in the figure). (E) Detail of a L. crispatum cell wall showing the arrangement of crystals with apparently noncalcified spaces at the interstitial zone (dotted rectangle). (F) In the image 2F, it is missing de letter "F" in the white box. Demineralized cell wall of L. crispatum showing the organic phase that makes part of the original nondemineralized structure. Some fibrils from the organic matrix are indicated by the black arrows and most probably correspond to the contour of the crystalline phase in the bulk of cell wall. Note the higher concentration of organic matrix in the interstitial zone (dotted rectangle). CW: cell wall; Cell: region originally occupied by the cell bodies.

  • Integration of chlorophyll a fluorescence and photorespirometry techniques to understand production dynamics in macroaglal communities
  • Molecular phylogeny and taxonomic revision of the genus Wittrockiella (Pithophoraceae, Cladophorales), including the descriptions of W. australis sp. nov. and W. zosterae sp. nov.
  • Timing of the evolutionary history of Corallinaceae (Corallinales, Rhodophyta)
  • Diatom life cycles and ecology in the Cretaceous
  • The function of the ocelloid and piston in the dinoflagellate Erythropsidinium (Gymnodiniales, Dinophyceae)
  • Biomineralization of calcium carbonate in the cell wall of Lithothamnion crispatum (Hapalidiales, Rhodophyta): correlation between the organic matrix and the mineral phase

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Read the latest Letters from the February 2017 issue: "Kelp transcriptomes provide robust support for interfamilial relationships and revision of the little known Arthrothamnaceae (Laminariales)" (Jackson et al.) and "Using complementary approaches to identify trans-domain nuclear gene transfers in the extremophile Galdieria sulphuraria (Rhodophyta)" (Azad et al.).

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