Emission of cyanobacterial volatile organic compounds and their roles in blooms

Zuo, Zhaojiang

doi:10.3389/fmicb.2023.1097712

Cited by 10 publications

(3 citation statements)

References 59 publications

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“…The best geochemical evidence presently available suggests that this light would have been present on Earth's surface from before the origin of life (at ∼3.9 Ga) and for at least 1000 (perhaps even for 1500 [34]) million years until organisms evolved oxygenic photosynthesis which saturated available oxygen sinks [34,35,37], leading to a protective ozone layer in the stratosphere. Additionally, cyanobacteria (and today's plants) emit volatile organic compounds (VOCs) which, together with atmospheric oxides of nitrogen, are the precursors for photochemical production of ozone in the troposphere [38,39]. Oxygen and ozone are thus considered here as biology-procured pigments, today dissipating the UV-C region in the upper atmosphere, thereby allowing the present dissipative structuring of the more delicate (i.e., prone to UV-C disassociation) complex biosynthetic pathways producing visible pigments at Earth's surface using multiple visible photons of lower energy but of much higher intensity.…”

Section: The Photochemistry Of Organic Moleculesmentioning

confidence: 99%

The Non-Equilibrium Thermodynamics of Natural Selection: From Molecules to the Biosphere

Michaelian

2023

Entropy

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Evolutionary theory suggests that the origin, persistence, and evolution of biology is driven by the “natural selection” of characteristics improving the differential reproductive success of the organism in the given environment. The theory, however, lacks physical foundation, and, therefore, at best, can only be considered a heuristic narrative, of some utility for assimilating the biological and paleontological data at the level of the organism. On deeper analysis, it becomes apparent that this narrative is plagued with problems and paradoxes. Alternatively, non-equilibrium thermodynamic theory, derived from physical law, provides a physical foundation for describing material interaction with its environment at all scales. Here we describe a “natural thermodynamic selection” of characteristics of structures (or processes), based stochastically on increases in the global rate of dissipation of the prevailing solar spectrum. Different mechanisms of thermodynamic selection are delineated for the different biotic-abiotic levels, from the molecular level at the origin of life, up to the level of the present biosphere with non-linear coupling of biotic and abiotic processes. At the levels of the organism and the biosphere, the non-equilibrium thermodynamic description of evolution resembles, respectively, the Darwinian and Gaia descriptions, although the underlying mechanisms and the objective function of selection are fundamentally very different.

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Section: The Photochemistry Of Organic Moleculesmentioning

confidence: 99%

The Non-Equilibrium Thermodynamics of Natural Selection: From Molecules to the Biosphere

Michaelian

2023

Entropy

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“…Cyanobacteria, commonly known as blue-green algae, are single-celled or filamentous organisms capable of oxygenic photosynthesis [1][2][3]. They thrive in various environments, such as soils, freshwater bodies, thermal springs, and marine ecosystems [4].…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Cyanotoxins in Fishponds in Nigeria and South Africa

Bassey,

Gumbo,

Mujuru

et al. 2024

Microbiology Research

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Over the decades, the aquaculture sector has witnessed substantial growth, contributing significantly to the nation’s economy. However, the menace of CyanoHABs threatens the sustainability of fish farming. Considering the possible hazards linked to cyanotoxins in food and water, a comparative study design between commercial fish in Nigeria and South Africa was employed to investigate cyanotoxins in the water from fishponds. Six commercial fishponds in Calabar Municipality—Nigeria and Duthuni—South Africa with varying climatic zones were selected. Water samples from the ponds were collected at intervals during different seasons (summer, winter, dry, and wet seasons) to capture climate-induced variation. Liquid chromatography–mass spectrometry (LCMS) in combination with the metabolites database was used for the identification of toxic cyanometabolites in water samples. The molecular networking approach, coupled with the Global Natural Products Social Molecular Networking (GNPS) database and CANOPUS annotation, enabled the putative identification of cyanometabolites. The resulting molecular network unveiled discernible clusters representing related molecule families, aiding in the identification of both known cyanotoxins and unfamiliar analogues. Furthermore, the molecular network revealed that water samples from different fishponds shared specific metabolites, including ethanesulfonic acid, pheophorbide A, cholic acid, phenylalanine, amyl amine, phosphocholine (PC), and sulfonic acid, despite variations in location, local climatic factors, and sampling sites. The fishponds in Nigeria showed the presence of multiple cyanotoxin classes in the dry, wet, and summer seasons in the water. Aflatoxin was identified in all sampling sites in Nigeria (N1, N2, and N3). The Duthuni, South Africa, sampling sites (P1, P2, and P3) exhibited the presence of microginins and microcystins. All the fishponds displayed a widespread occurrence of anabaenopeptins, aplysiatoxins, aflatoxin, microcolins, and marabmids during the selected summer. In conclusion, the untargeted metabolome analysis, guided by GNPS, proved highly effective in identifying both toxic and non-toxic metabolites in fishponds.

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“…Among these VOCs, terpenes are the primary type, with isoprene and monoterpenes as the major components and sesquiterpenes and diterpenes as the minor components [11,12]. For isoprene and monoterpenes, they are synthesized via the methylerythritol 4-phosphate pathway (MEP) [13,14]. Tobacco (Nicotiana tabacum) and Arabidopsis thaliana did not release isoprene, but the plants transferred into the isoprene synthase gene (ISPS) gradually increased isoprene emission with temperature elevation [11].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Physiological Responses of Cinnamomum camphora with Monoterpene Protection under High Temperature Shock

Wang,

Qian,

et al. 2023

Forests

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Monoterpenes can protect plants against high temperature, but the early events of protection are still unknown. In this study, the dynamic variations in reactive oxygen species metabolism, photosynthetic capacity, and related gene expression in linalool, eucalyptol, and camphor chemotypes of Cinnamomum camphora with and without monoterpene emission under 6 h high-temperature stress were investigated. With respect to the control (28 °C), 40 °C and Fos + 40 °C (fosmidomycin inhibited monoterpene biosynthesis under 40 °C) treatments increased H2O2 and thiobarbituric acid reactive substance levels in the three chemotypes, but without significant differences between the two treatments after 2 h. Compared with the 40 °C treatment, the Fos + 40 °C treatment further aggravated the increase after 4 h, with increases of 13.8%, 12.3%, and 12.3% in H2O2 levels as well as 16.5%, 17.4%, and 9.1% in thiobarbituric acid reactive substance levels, respectively, in linalool, eucalyptol, and camphor chemotypes. When the three chemotypes were treated with 40 °C and Fos + 40 °C, the ascorbic acid content was gradually decreased during the 2 h treatment. After 4 h, the Fos + 40 °C treatment further aggravated the decrease in ascorbic acid content, with decreases of 10.6%, 9.8%, and 20.1%, respectively, in the eucalyptol, linalool, and camphor chemotypes. This could be caused by the further down-regulation of the key gene GGP in antioxidant biosynthesis. Meanwhile, two genes (VTE3 and 4CL) in other non-enzymatic antioxidant formation were also further down-regulated in Fos + 40 °C treatment for 4 h. These might lead to the further increase in reactive oxygen species levels in Fos + 40 °C treatment lacking non-enzymatic antioxidants. The photosynthetic electron yield and transfer (φPo, Ψo and φEo) in the three chemotypes were significantly (p < 0.05) decreased under the 40 °C and Fos + 40 °C treatments for 0.5 h, and the photosynthetic rate was significantly (p < 0.05) decreased in the two treatments for 1 h. After 4 h, the Fos + 40 °C treatment aggravated the decrease, as the genes encoding the components of photosystem II (psbP and psbW) and ribulose-1,5-bisphosphate carboxylase/oxygenase (rbcS and rbcL) were further down-regulated. These dynamic variations in the early events suggested that monoterpenes should act as signaling molecules to improve plant thermotolerance, as blocking monoterpene biosynthesis did not cause immediate effects on the physiological responses in contrast to the monoterpene-emitting plants during the 2 h high temperature stress, but resulted in serious damages after 4 h for suppressing related gene expression. This not only provides new proof for the isoprenoid thermotolerance mechanism by serving a signaling function, but also promotes the utilization of monoterpenes as anti-high-temperature agents, and the cultivation of high-temperature tolerance varieties with abundant monoterpene emission.

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Emission of cyanobacterial volatile organic compounds and their roles in blooms

Cited by 10 publications

References 59 publications

The Non-Equilibrium Thermodynamics of Natural Selection: From Molecules to the Biosphere

The Non-Equilibrium Thermodynamics of Natural Selection: From Molecules to the Biosphere

Comparative Analysis of Cyanotoxins in Fishponds in Nigeria and South Africa

Dynamic Physiological Responses of Cinnamomum camphora with Monoterpene Protection under High Temperature Shock

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