Effect of UV-B Radiation and Desiccation Stress on Photoprotective Compounds Accumulation in Marine Leptolyngbya sp.

Joshi, Devika; Mohandass, Chellandi; Dhale, Mohan Appasaheb

doi:10.1007/s12010-017-2523-3

Cited by 40 publications

(17 citation statements)

References 38 publications

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“…Effects of UV exposure on marine biota include direct changes to metabolism, pigmentation, reproductive output, genetic material and survival, as reported for a wide range of taxa (Helbling and Zagarese, 2003;Banaszak and Lesser, 2009;Llabres et al, 2013), including phytoplankton (Llabres et al, 2010;Nahon et al, 2010;Yadav et al, 2016;Shi et al, 2017;Joshi et al, 2018), macroalgae (van de Poll et al, 2001;Schweikert et al, 2011;Ayres-Ostrock and Plastino, 2014;Xiao et al, 2015), seagrasses (Larkum and Wood, 1993), tunicates Hirose et al, 2006), corals (Gleason et al, 2006;Ferrier-Pages et al, 2007;Torregiani and Lesser, 2007;Torres-Perez and Armstrong, 2012), bivalves (Buck et al, 2002), echinoderms (Shick et al, 1992;Karentz et al, 1997), crustaceans (Kim et al, 2015;Zeni et al, 2015;Carreja et al, 2016), and fish (Kaweewat and Hofer, 1997;Zamzow et al, 2013;Carrasco-Malio et al, 2014). Furthermore, UV radiation can cause damage indirectly through the production of reactive oxygen species (ROS) that subsequently disrupt protein synthesis and the integrity of photosynthetic membranes (Lesser et al, 1990;Lesser, 1996), or by enhancing the toxicity of harmful compounds (e.g., petroleum products) present in the water column (Gomes et al, 2009;Barron, 2017;Overmans et al, 2018).…”

Section: Introductionmentioning

confidence: 95%

Unraveling the Seasonality of UV Exposure in Reef Waters of a Rapidly Warming (Sub-)tropical Sea

Overmans

Agustı́

2020

Front. Mar. Sci.

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Ultraviolet radiation (UV) is a crucial abiotic stressor that can have severe impacts on biota residing in the upper euphotic zone, especially if UV stress coincides with other stressors such as extreme sea surface temperatures (SSTs). Exposure-dependent effects of UV exposure have been described for a broad range of marine taxa and ecosystems such as coral reefs, yet little is known about the magnitude and seasonality of UV exposure in natural waters. In the present study, we determined how daily exposure of UV-B and UV-A varies seasonally along the water column of a reef system in the central Red Sea, and identified periods when damaging UV levels are likely to coincide with episodes of extreme SST, both presently and in the future. Between July 2016 and September 2018, UV spectroradiometer profiles were recorded fortnightly at a pelagic site adjacent to a mid-shore reef off the Saudi Arabian Red Sea coast, while atmospheric UV-B and UV-A irradiances were measured in 10-min intervals. Additionally, we quantified the concentration of chlorophyll-a (Chl-a) and absorption by chromophoric dissolved organic matter (aCDOM) in the reef as well as the surrounding waters. Biologically effective optical depths (Z10%) ranged from 6.3-12.9 m (UV-B) and 14.4-27.3 m (UV-A), with the highest UV transparency being observed in late summer when photodegradation of dissolved organic matter (DOM) was most intense and the concentration and molecular weight of CDOM were at their lowest. Incident UV peaked a few weeks prior to this later summer maximum in UV transparency. Consequently, organisms living close to the water surface experienced their most intense UV exposure in May/June, while the timing of maximum UV exposure for biota below ∼2-4 m coincided with the annual peak in water transparency and water temperature, i.e., in July/August. However, SSTs in the Red Sea are increasing at a rapid rate due to climate change, with the consequence that extreme temperatures are occurring earlier in the year and may eventually coincide with extreme UV radiation in shallower areas of the reef. This development could have potentially detrimental effects on highly sensitive, immotile reef biota such as reef-building corals.

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Section: Introductionmentioning

confidence: 95%

Unraveling the Seasonality of UV Exposure in Reef Waters of a Rapidly Warming (Sub-)tropical Sea

Overmans

Agustı́

2020

Front. Mar. Sci.

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“…Non-toxic secondary metabolites from cyanobacteria include various chemical classes such as phytohormones, siderophores, and UV-absorbing compounds such as mycosporine amino acids (MAAs) and scytonemin ( 58 ); all of these have been reported in Leptolyngbya sp. ( Figure 18 ) [ 23 , 75 , 76 ]. These latter two series of compounds have been shown to protect photosynthetic cyanobacteria from solar UV damage [ 23 ].…”

Section: Chemical Diversity Of the Secondary Metabolites Isolated mentioning

confidence: 99%

“…These latter two series of compounds have been shown to protect photosynthetic cyanobacteria from solar UV damage [ 23 ]. An investigation of UV-B photoprotective compounds in marine Leptolyngbya discovered shinorine ( 59 ) ( Figure 18 ), which is now realized to be one of the most dominant MAAs present in several species of cyanobacteria [ 75 ]. Scytonemin has a broader absorption profile than the MAAs, protecting against the solar irradiance damage across the UV (UV-A, -B and -C; 250–425 nm).…”

Section: Chemical Diversity Of the Secondary Metabolites Isolated mentioning

confidence: 99%

The Chemistry, Biochemistry and Pharmacology of Marine Natural Products from Leptolyngbya, a Chemically Endowed Genus of Cyanobacteria

Naman

Alexander

et al. 2020

Marine Drugs

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Leptolyngbya, a well-known genus of cyanobacteria, is found in various ecological habitats including marine, fresh water, swamps, and rice fields. Species of this genus are associated with many ecological phenomena such as nitrogen fixation, primary productivity through photosynthesis and algal blooms. As a result, there have been a number of investigations of the ecology, natural product chemistry, and biological characteristics of members of this genus. In general, the secondary metabolites of cyanobacteria are considered to be rich sources for drug discovery and development. In this review, the secondary metabolites reported in marine Leptolyngbya with their associated biological activities or interesting biosynthetic pathways are reviewed, and new insights and perspectives on their metabolic capacities are gained.

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“…Hyphomonas sp. are chemoorganotrophic (Weiner et al, 2000), whereas members of Leptolyngbya and Pleurocapsa are photoautotrophic and can perform oxygenic photosynthesis (Waterbury and Stanier, 1978;Shimura et al, 2015;Joshi et al, 2018). On one hand, the heterogeneous nature of these biofilms helps microbes survive in the toxic environment.…”

Section: Taxonomic Composition and Functionmentioning

confidence: 99%

Metagenomic Resolution of Functional Diversity in Copper Surface-Associated Marine Biofilms

Zhang

et al. 2019

Front. Microbiol.

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We used metagenomic sequencing combined with morphological and chemical analyses to investigate microbial taxa and functions related to copper-resistance and microbiologically influenced corrosion in mature copper-associated biofilms in coastal seawater for 44 months. Facultative anaerobic microbes such as Woeseia sp. were found to be the dominant groups on the copper surface. Genes related to stress response and possible heavy metal transport systems, especially RNA polymerase sigma factors (rpoE) and putative ATP-binding cassette (ABC) transport system permease protein (ABC.CD.P) were observed to be highly enriched in copperassociated biofilms, while genes encoding DNA-methyltransferase and RNA polymerase subunit were highly enriched in aluminum-associated biofilms and seawater planktonic cells, respectively. Moreover, copper-associated biofilms harbored abundant copperresistance genes including cus, cop and pco, as well as abundant genes related to extracellular polymeric substances, indicating the presence of diverse copper-resistance patterns. The proportion of dsr in copper-associated biofilms, key genes related to sulfide production, was as low as that in aluminum biofilm and seawater, which ruled out the possibility of microbial sulfide-induced copper-corrosion under field conditions. These results may fill knowledge gaps about the in situ microbial functions of marine biofilms and their effects on toxic-metal corrosion.

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Effect of UV-B Radiation and Desiccation Stress on Photoprotective Compounds Accumulation in Marine Leptolyngbya sp.

Cited by 40 publications

References 38 publications

Unraveling the Seasonality of UV Exposure in Reef Waters of a Rapidly Warming (Sub-)tropical Sea

Unraveling the Seasonality of UV Exposure in Reef Waters of a Rapidly Warming (Sub-)tropical Sea

The Chemistry, Biochemistry and Pharmacology of Marine Natural Products from Leptolyngbya, a Chemically Endowed Genus of Cyanobacteria

Metagenomic Resolution of Functional Diversity in Copper Surface-Associated Marine Biofilms

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