Fluorescence Characteristics of Photoinhibition and Recovery in a Sun and a Shade Species of the Red Algal Genus <i>Porphyra</i>

Bose, Salil; Herbert, Stephen K.; Fork, David C.

doi:10.1104/pp.86.3.946

Cited by 34 publications

(16 citation statements)

References 21 publications

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“…Recovery was highly dependent on duration and fluence rate as well. Similar results were obtained with the red algae Polyneura hilliae (Nultsch et al 1990) and two Porphyra species (Bose et al 1988). In the latter case, photoinhibition effects were more pronounced in the shade species, P. nereoeystis, than in the sun species, P. perforata.…”

Section: " ---supporting

confidence: 86%

Two components of onset and recovery during photoinhibition of Ulva rotundata

Franklin

Levavasseur

Osmond

et al. 1992

Planta

187

102

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Short-term (up to 5 h) transfers of shade-adapted (100 μmol · m(-2) · s(-1)) clonal tissue of the marine macroalga Ulva rotundata Blid. (Chlorophyta) to higher irradiances (1700, 850, and 350 μmol · m(-2) · s(-1)) led to photoinhibition of room-temperature chlorophyll fluorescence and O2 evolution. The ratio of variable to maximum (Fv/Fm) and variable (Fv) fluorescence, and quantum yield (ϕ) declined with increasing irradiance and duration of exposure. This decline could be resolved into two components, consistent with the separation of photoinhibition into energy-dissipative processes (photoprotection) and damage to photosystem II (PSII) by excess excitation. The first component, a rapid decrease in Fv/Fm and in Fv, corresponds to an increase in initial (Fo) fluorescence and is highly sensitive to 1 mM chloramphenicol. This component is rapidly reversible under dim (40 μmol · m(-2) · s(-1)) light, but is less reversible with increasing duration of exposure, and may reflect damage to PSII. The second (after 1 h exposure) component, a slower decline in Fv/Fm and Fv with declining Fo, appears to be associated with the photoprotective interconversion of violaxanthin to zeaxanthin and is sensitive to dithiothreitol. The accumulation of zeaxanthin in U. rotundata is very slow, and may account for the predominance of increases in Fo at high irradiances.

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Section: " ---supporting

confidence: 86%

Two components of onset and recovery during photoinhibition of Ulva rotundata

Franklin

Levavasseur

Osmond

et al. 1992

Planta

187

102

View full text Add to dashboard Cite

show abstract

“…Both low-and high-temperatureenhanced photoinhibition have been observed in unicellular algae and higher plants (Sadakane et al, 1981;Ludlow, 1987;Oquist, Greer & Ogren, 1987), and recent work with Porphyra sp. (Bose, Herbert & Fork, 1988;Herbert & Waaland, 1988) indicates that the mechanism of photoinhibition in macroalgae is the same as that in higher plants. L. baileyana plants transferred from 20 to 5°C bleach rapidly and die within 1-2 days at 100p.mole photons m-2s -1 but survive several days at 40 Ixmole photons m-2s -1.…”

Section: Discussionmentioning

confidence: 99%

Photosynthetic adaptation to temperature in the red algaeLomentaria baileyanaandLomentaria orcadensis

Kuebler

Davison

Yarish

1991

British Phycological Journal

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“…More analysis is needed, but the putative gene family expansion in Porphyra suggests positive selection for increased gene dosage. Porphyra was one of the first organisms where quenching of excess excitation energy in response to desiccation stress was observed (44), but the molecular mechanisms responsible for this quenching in red algae remain unclear.…”

Section: Significancementioning

confidence: 99%

“…Among the 13 genes encoding chlorophyll a-binding light-harvesting complex proteins are two "RedCap" genes (42), which may be involved in reorganization of the photosynthetic antenna during the shift from darkness to light (43). Porphyra also has 11 genes encoding "high light-induced" or "one-helix" proteins (here OHPs) that have essential roles for photoacclimation and cell viability under stressful environmental conditions (43,44). Mechanistically, OHPs may regulate chlorophyll and tetrapyrrole biosynthesis, stabilize photosystem I (PSI), bind free chlorophyll or chlorophyllbreakdown products from damaged PSII complexes during the damage/repair cycle, or bind carotenoids that dissipate excess absorbed light energy.…”

Section: Significancementioning

confidence: 99%

Insights into the red algae and eukaryotic evolution from the genome of Porphyra umbilicalis (Bangiophyceae, Rhodophyta)

Brawley¹,

Blouin²,

Ficko-Blean³

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

239

222

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Porphyra umbilicalis (laver) belongs to an ancient group of red algae (Bangiophyceae), is harvested for human food, and thrives in the harsh conditions of the upper intertidal zone. Here we present the 87.7-Mbp haploid Porphyra genome (65.8% G + C content, 13,125 gene loci) and elucidate traits that inform our understanding of the biology of red algae as one of the few multicellular eukaryotic lineages. Novel features of the Porphyra genome shared by other red algae relate to the cytoskeleton, calcium signaling, the cell cycle, and stress-tolerance mechanisms including photoprotection. Cytoskeletal motor proteins in Porphyra are restricted to a small set of kinesins that appear to be the only universal cytoskeletal motors within the red algae. Dynein motors are absent, and most red algae, including Porphyra, lack myosin. This surprisingly minimal cytoskeleton offers a potential explanation for why red algal cells and multicellular structures are more limited in size than in most multicellular lineages. Additional discoveries further relating to the stress tolerance of bangiophytes include ancestral enzymes for sulfation of the hydrophilic galactan-rich cell wall, evidence for mannan synthesis that originated before the divergence of green and red algae, and a high capacity for nutrient uptake. Our analyses provide a comprehensive understanding of the red algae, which are both commercially important and have played a major role in the evolution of other algal groups through secondary endosymbioses.cytoskeleton | calcium-signaling | carbohydrate-active enzymes | stress tolerance | vitamin B 12T he red algae are one of the founding groups of photosynthetic eukaryotes (Archaeplastida) and among the few multicellular lineages within Eukarya. A red algal plastid, acquired through secondary endosymbiosis, supports carbon fixation, fatty acid synthesis, and other metabolic needs in many other algal groups in ways that are consequential. For example, diatoms and haptophytes have strong biogeochemical effects; apicomplexans cause human disease (e.g., malaria); and dinoflagellates include both coral symbionts and toxin-producing "red tides" (1). The evolutionary processes that produced the Archaeplastida and secondary algal lineages remain under investigation (2-5), but it is clear that both nuclear and plastid genes from the ancestral red algae have contributed dramatically to broader eukaryotic evolution and diversity. Consequently, the imprint of red algal metabolism on the Earth's climate system, aquatic foodwebs, and

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Fluorescence Characteristics of Photoinhibition and Recovery in a Sun and a Shade Species of the Red Algal Genus Porphyra

Cited by 34 publications

References 21 publications

Two components of onset and recovery during photoinhibition of Ulva rotundata

Two components of onset and recovery during photoinhibition of Ulva rotundata

Photosynthetic adaptation to temperature in the red algaeLomentaria baileyanaandLomentaria orcadensis

Insights into the red algae and eukaryotic evolution from the genome of Porphyra umbilicalis (Bangiophyceae, Rhodophyta)

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