Photosynthetic properties of three Brazilian seaweeds

Chaloub, Ricardo M.; Reinert, Fernanda; Nassar, Cristina Aparecida Gomes; Fleury, Beatriz G.; Mantuano, Dulce; Larkum, Anthony W. D.

doi:10.1590/s0100-84042010000200017

Cited by 13 publications

(7 citation statements)

References 15 publications

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“…Nevertheless, qP values did not demonstrate a significant reduction in the plants analyzed in the exposed understory. Given that qP reflects the proportion of the open state PSII reaction centers, the high values of qP can result either from high rates of electron transfer around PSII or from the occurrence of high non photochemical quenching processes (Chaloub et al, 2010) and thus maintain good photosystem health (Lage-Pinto et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

Photosynthetic analyses of two native Atlantic Forest species in regenerative understory of eucalyptus plantation

Lage-Pinto

Bernini

Oliveira

et al. 2012

Braz. J. Plant Physiol.

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Gas exchange, chlorophyll a fluorescence, and photosynthetic pigments of Xylopia sericea A. St.-Hil. and Siparuna guianensis Aubl. were evaluated during the rainy season and the dry season (2009)(2010) in three understories with different ecological conditions (irradiance, water availability, and temperature) located in the União Biological Reserve (known as REBIO União), at Rio de Janeiro State, a natural forest understory, eucalyptus understory under regeneration, and understory of eucalyptus plantation with 18-year-old trees that were removed 1 year before. The lowest values of F v /F m e F m /F o were observed in the exposed understory for both seasons, with lower values in the dry season, suggesting that reduced water availability potentializes the photoinhibitory process. For both species of the exposed understory it is suggested the occurrence of photoprotection, given that an increased proportion of carotenoid pigments in relation to the chlorophylls were verified. Both species still exhibited dynamic photoinhibition after 1 year of exposure to full sunlight (exposed understory) in both seasons, but more markedly so in the dry season, though they belong to early stages of ecological succession. Based on the results, it is suggested that these species are indicated for planting in degraded areas and that the cutting of eucalyptus trees as management practice should be performed in a gradual manner, during the rainy season, in order to minimize stress on these species.

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Section: Discussionmentioning

confidence: 99%

Photosynthetic analyses of two native Atlantic Forest species in regenerative understory of eucalyptus plantation

Lage-Pinto

Bernini

Oliveira

et al. 2012

Braz. J. Plant Physiol.

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“…The state of health of the seaweeds was assessed prior to the experiment using a diving Pulse Amplitude Modulator (PAM) Fluorometer (Zarges 40701 Heinz Walz GMBH) and after the 4 h incubation ( Chaloub et al, 2010 ; Leedham Elvidge et al, 2015 ; Li et al, 2014 ). The change in F v ∕ F m was calculated according to the following formula:…”

Section: Methodsmentioning

confidence: 99%

Halocarbon emissions by selected tropical seaweeds: species-specific and compound-specific responses under changing pH

Mithoo-Singh

Keng

Phang

et al. 2017

PeerJ

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Five tropical seaweeds, Kappaphycus alvarezii (Doty) Doty ex P.C. Silva, Padina australis Hauck, Sargassum binderi Sonder ex J. Agardh (syn. S. aquifolium (Turner) C. Agardh), Sargassum siliquosum J. Agardh and Turbinaria conoides (J. Agardh) Kützing, were incubated in seawater of pH 8.0, 7.8 (ambient), 7.6, 7.4 and 7.2, to study the effects of changing seawater pH on halocarbon emissions. Eight halocarbon species known to be emitted by seaweeds were investigated: bromoform (CHBr3), dibromomethane (CH2Br2), iodomethane (CH3I), diiodomethane (CH2I2), bromoiodomethane (CH2BrI), bromochloromethane (CH2BrCl), bromodichloromethane (CHBrCl2), and dibromochloromethane (CHBr2Cl). These very short-lived halocarbon gases are believed to contribute to stratospheric halogen concentrations if released in the tropics. It was observed that the seaweeds emit all eight halocarbons assayed, with the exception of K. alvarezii and S. binderi for CH2I2 and CH3I respectively, which were not measurable at the achievable limit of detection. The effect of pH on halocarbon emission by the seaweeds was shown to be species-specific and compound specific. The highest percentage changes in emissions for the halocarbons of interest were observed at the lower pH levels of 7.2 and 7.4 especially in Padina australis and Sargassum spp., showing that lower seawater pH causes elevated emissions of some halocarbon compounds. In general the seaweed least affected by pH change in terms of types of halocarbon emission, was P. australis. The commercially farmed seaweed K. alvarezii was very sensitive to pH change as shown by the high increases in most of the compounds in all pH levels relative to ambient. In terms of percentage decrease in maximum quantum yield of photosynthesis (Fv∕Fm) prior to and after incubation, there were no significant correlations with the various pH levels tested for all seaweeds. The correlation between percentage decrease in the maximum quantum yield of photosynthesis (Fv∕Fm) and halocarbon emission rates, was significant only for CH2BrCl emission by P. australis (r = 0.47; p ≤ 0.04), implying that photosynthesis may not be closely linked to halocarbon emissions by the seaweeds studied. Bromine was the largest contributor to the total mass of halogen emitted for all the seaweeds at all pH. The highest total amount of bromine emitted by K. alvarezii (an average of 98% of total mass of halogens) and the increase in the total amount of chlorine with decreasing seawater pH fuels concern for the expanding seaweed farming activities in the ASEAN region.

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“…Low values of F V /F M indicate that the algae are less tolerant to high radiation. Red algae usually have a lower F V /F M than that of green and brown macroalgae (Chaloub et al 2010), as observed for P. capillacea. Low ETR curves at 300 μmol(photon) m -2 s -1 could be expected for a shade-adapted alga, then the capacity for transfer and transport electrons through the electron transport chain of the photosystem is adapted for reducing the transport rate to avoid photoxidative excessive energy and oxidative stress (Bautista and Necchi 2008).…”

Section: Discussionmentioning

confidence: 67%

Physiological responses of Pterocladiella capillacea (Rhodophyta, Gelidiales) under two light intensities

Harb¹,

Nardelli²,

Chow³

2018

Photosynt.

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Macroalgae must be able to survive in conditions of different light intensities with no damage to their physiological performance or vital processes. Irradiance can stimulate the biosynthesis of certain photoprotective compounds of biotechnological interest, such as pigments and proteins. Pterocladiella capillacea is a shade-grown alga, which play a role key in the balance of marine ecosystems. In addition, it is considered one of the best sources of bacteriological agar and agarose with a wide pharmacological potential. In order to evaluate the photosensitivity in P. capillacea under 60 (control) and moderate light intensity of 300 μmol(photon) m-2 s-1 , photosynthetic performance and chemical composition were assessed. P. capillacea showed photosensitivity without evidence of photodamage. The results indicate the possibility to increase a growth rate and probably infer productivity in long-term cultivation by stimulation at moderate light intensity. Increasing photosynthetic pigment and protein contents were also observed under medium light, an interesting result for functional ingredient approaches.

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Photosynthetic properties of three Brazilian seaweeds

Cited by 13 publications

References 15 publications

Photosynthetic analyses of two native Atlantic Forest species in regenerative understory of eucalyptus plantation

Photosynthetic analyses of two native Atlantic Forest species in regenerative understory of eucalyptus plantation

Halocarbon emissions by selected tropical seaweeds: species-specific and compound-specific responses under changing pH

Physiological responses of Pterocladiella capillacea (Rhodophyta, Gelidiales) under two light intensities

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