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  • 1
    Online Resource
    Online Resource
    Cham :Springer International Publishing AG,
    Keywords: Algae-Physiology. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (534 pages)
    Edition: 1st ed.
    ISBN: 9783030333973
    Series Statement: Advances in Photosynthesis and Respiration Series ; v.45
    Language: English
    Note: Intro -- Copyright -- From the Series Editors -- Authors of Volume 45 -- Our Books -- Series Editors -- Contents -- Preface: A Brief Introduction to the Algae -- The Evolution of Photosynthesis -- The Evolution of Algae -- The Evolution of Eukaryotic Algae -- About the Editors -- Contributors -- Author Index -- Part I: Introductory Chapters -- Chapter 1: Recent Advances in the Photosynthesis of Cyanobacteria and Eukaryotic Algae -- I. Algal Systematics -- II. Cyanobacteria -- III. Crystal Structures -- IV. Light Harvesting -- V. Photoinhibition -- VI. Dinoflagellates and Coral Bleaching -- VII. Carbon Uptake and Metabolism (See Chap. 7 & -- 8) -- VIII. Water-Water Cycles (See Chap. 8) -- References -- Chapter 2: The Algal Tree of Life from a Genomics Perspective -- I. Introduction -- II. Why Inferring the Algal Tree of Life Is Non-trivial -- III. Examples of Reticulate Behavior Among Algal Genes -- IV. From Designer Datasets to Whole Genomes -- V. Conclusions -- Acknowledgments -- References -- Part II: Molecular Genetics of Algae -- Chapter 3: Chlorophyll-Xanthophyll Antenna Complexes: In Between Light Harvesting and Energy Dissipation -- I. Introduction -- II. Chromophores -- III. The Core Complexes of PSII and PSI -- IV. Light Harvesting -- A. Type I (LHCBM3, 4, 6, 8 and 9) -- B. Type II (LHCBM5) -- C. Type III (LHCBM2 and 7) -- D. Type IV (LHCBM1) -- V. Antenna Complexes of PSI -- VI. Fucoxanthin Chlorophyll Binding Proteins -- VII. Photoprotection -- VIII. Triggers of Quenching Reactions -- IX. Conclusions -- Acknowledgements -- References -- Chapter 4: The Dynamics of the Photosynthetic Apparatus in Algae -- I. Introduction -- II. Adaptation to Changes in Light Conditions -- A. State Transitions -- B. Non Photochemical Quenching (NPQ) -- C. PSII Repair Cycle. , III. Response of the Photosynthetic Apparatus to Micronutrient Depletion -- A. Copper Deficiency -- B. Iron Deficiency -- C. Sulfur Deprivation and Hydrogen Production -- D. Nitrogen Deprivation -- IV. Long Term Response: Changes in Nuclear and Chloroplast Gene Expression -- V. Conclusions and Perspectives -- Acknowledgements -- References -- Chapter 5: Biosynthesis of Chlorophyll and Bilins in Algae -- I. Introduction -- II. Diversity of Chlorophylls in Algae -- III. Diversity of Bilins in Algae -- IV. Overview of Biosynthesis of Bilins and Chlorophylls -- V. Biosynthesis of Protoporphyrin IX -- VI. Biosynthesis of Bilins from Protoporphyrin and Function of Bilin Lyases -- VII. Biosynthesis of Chlorophylls from Protoporphyrin IX -- VIII. Synthesis of Chlorophyll b, d and f -- IX. Concluding Remarks -- Bibliography -- Part III: Biochemistry and Physiology of Algae -- Chapter 6: Chloroplast Ion and Metabolite Transport in Algae -- I. Introduction -- II. Chloroplast Ion Transport -- A. Ion Channels -- 1. Voltage-Dependent Chloride Channels -- 2. Mechanosensitive Ion Channels -- 3. K+ Channels -- 4. Ca2+ Channels -- B. Ion Transporters -- 1. Phosphate Transporters -- 2. Sulfate Transporters -- 3. Nitrite Transporters -- 4. Potassium Proton Exchangers -- 5. Manganese and Calcium Transporters -- 6. Magnesium Transporters -- 7. Iron Transporters -- C. Ion Pumps (P-ATPases) -- D. ABC Transporters -- III. Chloroplast Metabolite Transport -- A. ATP Transporters -- 1. Plastidic Nucleotide Translocators -- 2. The Thylakoid ATP/ADP Carrier -- B. Plastidic Phosphate Transporters -- 1. Triose-Phosphate Transporters -- 2. Phosphoenolpyruvate Transporters -- 3. Glucose-6-Phosphate and Xylulose-5-Phosphate Translocators -- C. Bicarbonate Transporters -- D. Organic Acid Transporters -- E. Amino Acid Transporters -- F. Fatty Acid Transporters. , G. Lipid ABC Transporters -- IV. Strategies for Identification of Missing Algal Transporters -- V. Conclusions and Perspectives -- References -- Chapter 7: Structural and Biochemical Features of Carbon Acquisition in Algae -- I. Introduction -- II. Carbon Assimilation -- A. The Characteristics of Most Rubiscos Necessitate Operation of a CCM -- B. The PCRC and Other Pathways for C Assimilation -- III. Occurrence of CCMs -- IV. Mechanisms of CCMs Versus Diffusive CO2 Fluxes -- A. Definition of CCMs and What Do We Need in Order to Demonstrate Operation of CCMs? -- B. CCMs Based on Active Transport of Inorganic C Species -- C. C4 Photosynthesis as a CCM in Algae? -- V. Structural Aspects of CO2 Acquisition -- Acknowledgements -- References -- Chapter 8: Light-Driven Oxygen Consumption in the  Water-Water Cycles and Photorespiration, and Light Stimulated Mitochondrial Respiration -- I. Introduction -- II. The Evidence of Light-Dependent O2 Uptake -- III. Possible Mechanisms of Light-Driven O2 Uptake -- A. Water-Water Cycles -- B. The Mehler Ascorbate Peroxidase (MAP) Reactions Involving PSI and PSII -- C. Flavodiiron Protein Involving PSI and PSII -- D. Plastid (Plastoquinol) Terminal Oxidase (PTOX) Involving PSII but not PSI -- E. Photorespiration -- F. Mitochondrial Respiration -- G. Allocation of O2 Uptake Among the Five Pathways -- IV. Functions of the Light-Driven O2 Uptake Processes -- V. Conclusions -- Acknowledgements -- References -- Chapter 9: The Algal Pyrenoid -- I. Introduction -- A. A Pyrenoid Timeline - From Microscopic Curiosity to a Key Factor in the Earth's Carbon Cycle -- B. Pyrenoid Prevalence -- C. Independent Origins but Convergent Structures -- D. Diversity -- II. Pyrenoid Structure & -- Function: Lessons from Chlamydomonas -- A. Structure and Organisation. , B. Functional Integration of Pyrenoid Proteome and CCM Activity -- C. Integrating Transcriptomics and Pyrenoid-Associated Processes -- III. When, Where, How and Whither: From Paleo-Origins to Future Synthetic Biology -- References -- Part IV: Light-Harvesting Systems in Algae -- Chapter 10: Light-Harvesting in Cyanobacteria and Eukaryotic Algae: An Overview -- I. Introduction -- II. The Photosynthetic Pigments of Cyanobacteria and Eukaryotic Algae -- A. Chlorophylls -- 1. Chlorophyll a -- 2. Chlorophyll b -- 3. Chlorophyll c and MgDVD -- 4. Chlorophyll d -- 5. Chlorophyll f -- 6. Summary Comments on the Chlorophylls -- B. Carotenoids -- 1. Carotenes -- 2. Xanthophylls -- C. Phycobiliproteins -- III. The Evolution of Protists with Plastids (Algae) -- A. Algae with Primary Plastids -- 1. Glaucophyceae -- 2. Rhodophyceae -- 3. Chlorophyceae -- B. Secondary and Tertiary Plastids -- 1. Diatoms (Bacillariophyceae) and Related Phyla Including the Phaeophyceae -- 2. Related Phyla -- 3. Dinoflagellates -- 4. Cryptophytes (Cryptophyceae) -- 5. Other Stramenopiles, Haptophytes and Apicomplexans -- IV. The Need for Light-Harvesting Antennas -- V. Light-Harvesting Antennas in Cyanobacteria and Eukaryotic Algae -- VI. Control of Energy Supply to PSI and PSII: State Transitions, Absorption Cross-Sectional Changes and Spillover -- A. Overview -- B. State Transitions -- 1. State Transitions in Chlamydomonas -- 2. An Aside on Cyclic Electron Transport (CET) -- 3. State Transitions in Other Algae -- C. Absorption Cross-Sectional Changes -- D. Spillover -- E. Complementary Chromatic Adaptation -- F. Non-photochemical Quenching - Sensu Lato -- VII. Non-photochemical Quenching -- A. The Xanthophyll Cycle -- B. pH Quenching -- C. Orange Carotenoid Protein -- VIII. Reactive Oxygen Species (ROS) and Other Photoprotective Mechanisms -- Acknowledgements. , References -- Chapter 11: Light Harvesting by Long-Wavelength Chlorophyll Forms (Red Forms) in Algae: Focus on their Presence, Distribution and Function -- I. Long Wavelength ("Red") Chlorophyll a Forms: Historical Perspective on Their Discovery and General Overview -- II. Long Wavelength Chlorophyll Forms Associated to Photosystem I -- A. Photosystem I Core Red Forms -- B. Photosystem I External Antenna Red Forms -- C. Nature of Long Wavelength Chlorophyll Forms -- III. Long Wavelength Chlorophyll Forms Associated to Photosystem II -- A. PSII-Associated Long Wavelength Chlorophylls in Algae -- IV. Survey of Cyanobacterial and Algal Species for the Presence of Long-Wavelength Chlorophyll Forms -- A. Physiological and Environmental Consequences of the Presence of Red Forms (or Their Absence) -- V. Effect of Long Wavelength Chlorophyll Forms on the Photochemical Quantum Efficiency -- A. Simulations of the Impact of Red Forms on Excited State Energy Trapping -- 1.. Photosystem I -- 2.. Photosystem II -- VI. Concluding Remarks -- Acknowledgements -- References -- Chapter 12: Diversity in Photoprotection and Energy Balancing in Terrestrial and Aquatic Phototrophs -- I. Introduction -- II. Energy Storage and Regulation in Oxygenic Photosynthesis -- III. The pmf Paradigm for Regulation of the Photosynthetic Light Reactions -- IV. The Need to Coordinate qE and Photosynthetic Control -- V. The Critical Need to Balance the Chloroplast Energy Budget -- VI. Regulation of CEF -- VII. Modulation of pmf Feedback Regulation and Its Impact on Energy Balancing -- VIII. How Diverse Photoprotective Mechanisms Challenge the pmf Paradigm and Open Up New Questions -- IX. Coping with ATP Excess or NADPH Deficit -- A. Energy Balancing by Interactions Between Photosynthetic and Respiratory Machinery -- X. Conclusions and Perspective -- Acknowledgements. , References.
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  • 2
    Online Resource
    Online Resource
    San Diego :Elsevier Science & Technology,
    Keywords: Chlamydomonas. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (866 pages)
    Edition: 3rd ed.
    ISBN: 9780323910583
    DDC: 579.832
    Language: English
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  • 3
    Publication Date: 2020-02-06
    Description: Contents 670 I. 671 II. 671 III. 676 IV. 678 678 References 678 SUMMARY: Biotic interactions underlie life's diversity and are the lynchpin to understanding its complexity and resilience within an ecological niche. Algal biologists have embraced this paradigm, and studies building on the explosive growth in omics and cell biology methods have facilitated the in-depth analysis of nonmodel organisms and communities from a variety of ecosystems. In turn, these advances have enabled a major revision of our understanding of the origin and evolution of photosynthesis in eukaryotes, bacterial-algal interactions, control of massive algal blooms in the ocean, and the maintenance and degradation of coral reefs. Here, we review some of the most exciting developments in the field of algal biotic interactions and identify challenges for scientists in the coming years. We foresee the development of an algal knowledgebase that integrates ecosystem-wide omics data and the development of molecular tools/resources to perform functional analyses of individuals in isolation and in populations. These assets will allow us to move beyond mechanistic studies of a single species towards understanding the interactions amongst algae and other organisms in both the laboratory and the field.
    Type: Article , PeerReviewed
    Format: text
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  • 4
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Plant Physiology and Plant Molecular Biology 52 (2001), S. 163-210 
    ISSN: 1040-2519
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Notes: Abstract Organisms acclimate to a continually fluctuating nutrient environment. Acclimation involves responses specific for the limiting nutrient as well as responses that are more general and occur when an organism experiences different stress conditions. Specific responses enable organisms to efficiently scavenge the limiting nutrient and may involve the induction of high-affinity transport systems and the synthesis of hydrolytic enzymes that facilitate the release of the nutrient from extracellular organic molecules or from internal reserves. General responses include changes in cell division rates and global alterations in metabolic activities. In photosynthetic organisms there must be precise regulation of photosynthetic activity since when severe nutrient limitation prevents continued cell growth, excitation of photosynthetic pigments could result in the formation of reactive oxygen species, which can severely damage structural and functional features of the cell. This review focuses on ways that photosynthetic eukaryotes assimilate the macronutrients nitrogen, sulfur, and phosphorus, and the mechanisms that govern assimilatory activities. Also discussed are molecular responses to macronutrient limitation and the elicitation of those responses through integration of environmental and cellular cues.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Genetics 38 (2004), S. 119-173 
    ISSN: 0066-4197
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Notes: This review focuses on the biosynthesis of pigments in the unicellular alga Chlamydomonas reinhardtii and their physiological and regulatory functions in the context of information gathered from studies of other photosynthetic organisms. C. reinhardtii is serving as an important model organism for studies of photosynthesis and the pigments associated with the photosynthetic apparatus. Despite extensive information pertaining to the biosynthetic pathways critical for making chlorophylls and carotenoids, we are just beginning to understand the control of these pathways, the coordination between pigment and apoprotein synthesis, and the interactions between the activities of these pathways and those for other important cellular metabolites branching from these pathways. Other exciting areas relating to pigment function are also emerging: the role of intermediates of pigment biosynthesis as messengers that coordinate metabolism in the chloroplast with nuclear gene activity, and the identification of photoreceptors and their participation in critical cellular processes including phototaxis, gametogenesis, and the biogenesis of the photosynthetic machinery. These areas of research have become especially attractive for intensive development with the application of potent molecular and genomic tools currently being applied to studies of C. reinhardtii.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 215 (2002), S. 0 
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Certain cyanobacteria thrive in natural habitats in which light intensities can reach 2000 μmol photon m−2 s−1 and nutrient levels are extremely low. Recently, a family of genes designated hli was demonstrated to be important for survival of cyanobacteria during exposure to high light. In this study we have identified members of the hli gene family in seven cyanobacterial genomes, including those of a marine cyanobacterium adapted to high-light growth in surface waters of the open ocean (Prochlorococcus sp. strain Med4), three marine cyanobacteria adapted to growth in moderate- or low-light (Prochlorococcus sp. strain MIT9313, Prochlorococcus marinus SS120, and Synechococcus WH8102), and three freshwater strains (the unicellular Synechocystis sp. strain PCC6803 and the filamentous species Nostoc punctiforme strain ATCC29133 and Anabaena sp. (Nostoc) strain PCC7120). The high-light-adapted Prochlorococcus Med4 has the smallest genome (1.7 Mb), yet it has more than twice as many hli genes as any of the other six cyanobacterial species, some of which appear to have arisen from recent duplication events. Based on cluster analysis, some groups of hli genes appear to be specific to either marine or freshwater cyanobacteria. This information is discussed with respect to the role of hli genes in the acclimation of cyanobacteria to high light, and the possible relationships among members of this diverse gene family.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    Molecular microbiology 37 (2000), S. 0 
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: We have recently shown that phototactic movement in the unicellular cyanobacterium Synechocystis sp. PCC6803 requires type IV pilins. To elucidate further type IV pilus-dependent motility, we inactivated key genes implicated in pilus biogenesis and function. Wild-type Synechocystis sp. PCC6803 cells have two morphologically distinct pilus types (thick and thin pili). Of these, the thick pilus morphotype, absent in a mutant disrupted for the pilin-encoding pilA1 gene, appears to be required for motility. The thin pilus morphotype does not appear to be altered in the pilA1 mutant, raising the possibility that thin pili have a function distinct from that of motility. Mutants disrupted for pilA2, which encodes a second pilin-like protein, are still motile and exhibit no difference in morphology or density of cell-surface pili. In contrast, inactivation of pilD (encoding the leader peptidase) or pilC (encoding a protein required for pilus assembly) abolishes cell motility, and both pilus morphotypes are absent. Thus, the PilA1 polypeptide is required for the biogenesis of the thick pilus morphotype which, in turn, is necessary for motility (hence we refer to them as type IV pili). Furthermore, PilA2 is critical neither for motility nor for pilus biogenesis. Two genes encoding proteins with similarity to PilT, which is considered to be a component of the motor essential for type IV pilus-dependent movement, were also inactivated. A pilT1 mutant is (i) non-motile, (ii) hyperpiliated and (iii) accumulates higher than normal levels of the pilA1 transcript. In contrast, pilT2 mutants are motile, but are negatively phototactic under conditions in which wild-type cells are positively phototactic.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford BSL : Blackwell Science Ltd
    Molecular microbiology 30 (1998), S. 0 
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Light-harvesting in cyanobacteria and red algae is a function of the biliproteins, which have covalently bound bilin chromophores. The biliproteins are assembled with linker proteins into the phycobilisome, a large complex that resides on the surface of the photosynthetic membranes. Early steps in the phycobilisome assembly pathway include the folding of biliprotein α- and β-subunits, covalent modification of subunits by bilin attachment and formation of the primary assembly unit, the αβ heterodimer. The potential role of bilins in subunit structure and assembly is examined in this study by site mutagenesis of biliprotein genes. Phycocyanin subunits from Synechocystis sp. 6701 that were unable to bind chromophores at specific sites were generated by changing the codons for bilin-binding cysteines to alanine residues. The altered genes were then expressed in a phycocyanin-minus mutant of the transformable Synechocystis sp. strain 6803. Single and multiple chromophore deletions cause specific and reproducible variations in phycobilisome-associated phycocyanin that do not correlate with transcript levels. Sedimentation equilibrium studies with purified proteins showed that bilin absence reduces the strength of αβ interaction in the heterodimer. These results suggest that phycocyanin instability in bilin-deletion mutants is a consequence of diversion of unassembled α- and β-subunits to a degradation pathway. Attachment of the central bilin, which is common to all biliprotein subunits, may facilitate αβ interaction by completing the final stage of subunit folding and stabilizing the contact domains of binding partners in the heterodimer.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: The recent discovery of large numbers of phytochrome photoreceptor genes in both photosynthetic and non-photosynthetic prokaryotes has led to efforts to understand their physiological roles in environmental acclimation. One receptor in this class, RcaE, is involved in controlling complementary chromatic adaptation, a process that regulates the transcription of operons encoding light-harvesting proteins in cyanobacteria. Although all previously identified phytochrome responses are maximally sensitive to red and far red light, complementary chromatic adaptation is unique in that it is responsive to green and red light. Here, we present biochemical and genetic evidence demonstrating that RcaE is a photoreceptor and that it requires the cysteine at position 198 to ligate an open chain tetrapyrrole covalently in a manner analogous to chromophore attachment in plant phytochromes. Furthermore, although the wild-type rcaE gene can rescue red and green light photoresponses of an rcaE null mutant, a gene in which the codon for cysteine 198 is converted to an alanine codon rescues the red light but not the green light response. Thus, RcaE is a photoreceptor that is required for both green and red light responsiveness during complementary chromatic adaptation and is the first identified phytochrome class sensor that is involved in sensing and responding to green and red light rather than red and far red light.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 343 (1980), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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