Environmental Control of Vanadium Haloperoxidases and Halocarbon Emissions in Macroalgae

Punitha, Thillai; Phang, Siew Moi; Juan, Joon Ching; Beardall, John

doi:10.1007/s10126-018-9820-x

Cited by 23 publications

(13 citation statements)

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“…Haloperoxidase activity has a clear association with the production of halocarbons (Wever and van der Horst 2013;Punitha et al 2017; see also Introduction). A wide range of pH values of between 4 to 8.3 has been reported as an optimum range for haloperoxidase activities, while deviation from the optimal pH range adversely affects enzyme performance (Baden and Corbett 1980;Krenn et al 1987;Punitha et al 2017).…”

Section: Phmentioning

confidence: 99%

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The emission of volatile halocarbons by seaweeds and their response towards environmental changes

et al. 2020

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Volatile halocarbons can deplete the protective stratospheric ozone layer contributing to global climate change and may even affect local climate through aerosol production. These compounds are produced through anthropogenic and biogenic processes. Biogenic halocarbons may be produced as defence compounds, anti-oxidants, or by-products of metabolic processes. These compounds include very short-lived halocarbons (VSLH) e.g. bromoform (CHBr3), dibromomethane (CH2Br2), methyl iodide (CH3I), diiodomethane (CH2I2). Efforts to quantify the biogenic sources of these compounds, especially those of marine origin e.g. seaweeds, phytoplankton and seagrass meadows, are often complicated by inherent biological variability as well as spatial and temporal changes in emissions. The contribution of the coastal region and the oceans to the stratospheric load of halocarbons has been widely debated. This highlights the need to understand the factors affecting the release of these compounds from marine sources for which data for modelling purposes are generally lacking. Seaweeds are important sources of biogenic halocarbons subjected to changing environmental conditions. Huge uncertainties in the prediction of current and future global halocarbon pool exist due to the lack of spatial and temporal data input from coastal and oceanic sources. Therefore, investigating the effect of changing environmental conditions on the emission of VSLH by the seaweeds could help towards better estimations of halocarbon emissions. This is especially important in light of global changes in both climate and the environment, the expansion of seaweed cultivation industry, and the interactions between halocarbon emission and their environment. In this paper we review current knowledge of seaweed halocarbon emissions, how environmental factors affect these emissions, and identify gaps in understanding. Our aim is to direct much needed research to improve understanding of the contribution of marine biogenic sources of halocarbons and their impact on the environment.

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Section: Phmentioning

confidence: 99%

“…The activities of methyl transferases yield monohalogenated compounds including CH3Br, CH3I, di-and polyhalogenated compounds such as CHBr2I (Milkova et al 1997;Neilson, 2003;Amachi et al 2006;Küpper et al 2018). Punitha et al (2017) gives a detailed explanation of the reactions. Trihalogenated compounds e.g.…”

Section: Introductionmentioning

confidence: 99%

The emission of volatile halocarbons by seaweeds and their response towards environmental changes

et al. 2020

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“…Halocarbon production in the cell is related to stress, in the form of changes in environmental parameters like temperature and irradiance, grazing and microbial attacks, etc. (Leedham et al, 2013; Punitha et al, 2018). It is linked to production of reactive oxygen species (ROS) especially H 2 O 2 (Nishiyama, Allakhverdiev & Murata, 2006; Serôdio, Vieira & Cruz, 2008).…”

Section: Discussionmentioning

confidence: 99%

Effect of irradiance on the emission of short-lived halocarbons from three common tropical marine microalgae

Lim

Keng

Phang

et al. 2019

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Marine algae have been reported as important sources of biogenic volatile halocarbons that are emitted into the atmosphere. These compounds are linked to destruction of the ozone layer, thus contributing to climate change. There may be mutual interactions between the halocarbon emission and the environment. In this study, the effect of irradiance on the emission of halocarbons from selected microalgae was investigated. Using controlled laboratory experiments, three tropical marine microalgae cultures, Synechococcus sp. UMACC 371 (cyanophyte), Parachlorella sp. UMACC 245 (chlorophyte) and Amphora sp. UMACC 370 (diatom) were exposed to irradiance of 0, 40 and 120 µmol photons m−2s−1. Stress in the microalgal cultures was indicated by the photosynthetic performance (Fv/Fm, maximum quantum yield). An increase in halocarbon emissions was observed at 120 µmol photons m−2s−1, together with a decrease in Fv/Fm. This was most evident in the release of CH3I by Amphora sp. Synechococcus sp. was observed to be the most affected by irradiance as shown by the increase in emissions of most halocarbons except for CHBr3 and CHBr2Cl. High positive correlation between Fv/Fm and halocarbon emission rates was observed in Synechococcus sp. for CH2Br2. No clear trends in correlation could be observed for the other halocarbons in the other two microalgal species. This suggests that other mechanisms like mitochondria respiration may contribute to halocarbon production, in addition to photosynthetic performance.

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“…The third mechanism suggests the formation of methyl-iodide by vanadium-dependent haloperoxidases ( Punitha et al, 2018 ) in the presence of hydrogen peroxide ( Leblanc et al, 2006 ). Iodine specific iodoperoxidase was identified in various marine diatoms and macrophytes ( Colin et al, 2003 ).…”

Section: Mechanisms Of Methyl-iodides’ Genesismentioning

confidence: 99%

Production of Methyl-Iodide in the Environment

et al. 2021

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Iodine is an essential micronutrient for most of the living beings, including humans. Besides its indispensable role in animals, it also plays an important role in the environment. It undergoes several chemical and biological transformations resulting in the production of volatile methylated iodides, which play a key role in the iodine’s global geochemical cycle. Since it can also mitigate the process of climate change, it is reasonable to study its biogeochemistry. Therefore, the aim of this review is to provide information on its origin, global fluxes and mechanisms of production in the environment.

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Environmental Control of Vanadium Haloperoxidases and Halocarbon Emissions in Macroalgae

Cited by 23 publications

References 184 publications

The emission of volatile halocarbons by seaweeds and their response towards environmental changes

The emission of volatile halocarbons by seaweeds and their response towards environmental changes

Effect of irradiance on the emission of short-lived halocarbons from three common tropical marine microalgae

Production of Methyl-Iodide in the Environment

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