Changes in Pigment Composition and Photosynthetic Activity of Aquatic Fern (Azolla Microphylla Kaulf.) Exposed to Low Doses of UV-C (254 nm) Radiation

Jayakumar, Muthukrishnan; Eyini, M.; Selvinthangadurai, P.; Lingakumar, K.; Premkumar, A.; Kulandaivelu, G.

doi:10.1023/a:1007010727978

Cited by 15 publications

(7 citation statements)

References 14 publications

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“…UV-C radiation, unlike UV-A and UV-B, is completely filtered by the ozone layer and is considered to be the most harmful to living beings due to its highly energetic photons. Its strong germicidal effect causes irreversible damage to photosynthetic organisms (Adhikary & Sahu, 1998;Danon & Gallois, 1998;Jayakumar et al, 1999;Zvezdanović et al, 2009) and, in the case of algae and cyanobacteria, it has been demonstrated that this type of radiation has the potential to cause serious damage in the cell constituents involved in photosynthesis (Alam et al, 2001;Moharikar et al, 2006;Sakai et al, 2007;Tao et al, 2010Tao et al, , 2013Ou et al, 2011Ou et al, , 2012 (works cited in Borderie et al, 2014a). It is therefore used mainly as biocidal and disinfectant lighting in several sectors such as medicine, the food industry and water treatment (Borderie et al, 2014a).…”

Section: Ultraviolet Radiation (Uv-c)mentioning

confidence: 99%

The lampenflora in show caves and its treatment: an emerging ecological problem

Estévez¹,

Moreno-Merino²,

Román³

et al. 2019

IJS

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The artificial lighting of caves adapted for touristic visits, leads to the appearance and propagation of a complex community of phototrophic organisms known as "lampenflora". Formed mainly by algae and cyanobacteria, they produce the degradation of the colonized substrates and decrease the show value of the caves. This phenomenon became famous worldwide in the 1960s due to the damage caused to the paintings in the Lascaux Cave (France). Since then it has become an issue of serious concern to both managers of show caves and to the international scientific community. Over time, the problem has been approached following two complementary strategies: preventing colonization by the invading organisms or eliminating them once they have become established through the use of chemical products, mainly biocides and strong oxidants. This kind of treatment generates pollutant effluents that can move the problem from the walls of the caves to the groundwater. This paper presents a critical literature review of the problem and the proposed solutions, and emphasizes the need for further study of the optimal doses of treatment chemicals and to develop quantitative methods to determine their effectiveness. . The lampenflora in show caves and its treatment: an emerging ecological problem.

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Section: Ultraviolet Radiation (Uv-c)mentioning

confidence: 99%

The lampenflora in show caves and its treatment: an emerging ecological problem

Estévez¹,

Moreno-Merino²,

Román³

et al. 2019

IJS

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“…3,9 However, effects on flavonoid contents and compositions differ in diverse plants induced by UV radiation. 10 Powerful UV-C radiation has been shown to have great effects on fruits, including a number of benefits after exposure to low-dose light, such as delayed senescence, 11 maintenance of a firm and green texture, 12 enhancement of flavor and antioxidant capacity, and resistance to phytopathogens. 13 Soluble carbohydrate, sugar, chlorophyll, and proline concentrations decreased after UV exposure, while the concentrations of UV-absorbing pigments and soluble proteins increased in canola (Brassica napus L.) leaves.…”

Section: Introductionmentioning

confidence: 99%

“…These biological activities include antioxidant function and the ability to alter enzyme activities and modulate second messenger systems and gene expression . UV radiation could increase anthocyanin contents in berry fruit, i.e., Vitis vinifera and Ribes nigrum , resulting from a UV-mediated stress response. , However, effects on flavonoid contents and compositions differ in diverse plants induced by UV radiation …”

Section: Introductionmentioning

confidence: 99%

Transcriptional Activation of Anthocyanin Biosynthesis in Developing Fruit of Blueberries (Vaccinium corymbosum L.) by Preharvest and Postharvest UV Irradiation

Jiao

Shi

et al. 2018

J. Agric. Food Chem.

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The effect and mechanism of preharvest and postharvest ultraviolet (UV) irradiation on anthocyanin biosynthesis during blueberry development were investigated. The results showed that preharvest UV-B,C and postharvest UV-A,B,C irradiation significantly promoted anthocyanin biosynthesis and the transcripts of late biosynthetic genes (LBG) VcDFR, VcANS, VcUFGT, and VcMYB transcription factor as well as DFR and UFGT activities in anthocyanin pathway in a UV wavelength- and developmental stage-dependent manner. VcMYB expression was positively correlated with that of VcANS and VcUFGT and coincided with anthocyanin biosynthesis responding to the UV radiation. Sugar decreased during postharvest but increased during preharvest UV radiation in mature fruit. Our results indicate that UV-responsive production of anthocyanins is mainly caused by the activation of anthocyanin downstream pathway genes, which could be upregulated by VcMYB. Furthermore, different potential response mechanisms may exist between preharvest and postharvest UV radiation in blueberries, involving a systemic response in living plants and a nonsystemic response in postharvest fruit.

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“…Indeed, the synthesis of flavonoids was triggered in Azolla spp. after exposure to higher UV radiation (Jayakumar et al, 1999 ), and their accumulation has been already demonstrated in Azolla plants to scavenge an excessive ROS production induced by cadmium stress (Dai et al, 2012 ). Among the phenolic compounds we analyzed, phenolic acids were the only ones that were not stimulated by increasing light conditions (Figure S7E,F ).…”

Section: Discussionmentioning

confidence: 97%

Section: Response Of Azolla Filiculoides Grown At Low Light After Sho...mentioning

confidence: 94%

Exposure to different light intensities affects emission of volatiles and accumulations of both pigments and phenolics in Azolla filiculoides

Brilli

Dani

Pasqualini

et al. 2022

Physiologia Plantarum

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Many agronomic trials demonstrated the nitrogen‐fixing ability of the ferns Azolla spp. and its obligate cyanobiont Trichormus azollae. In this study, we have screened the emission of volatile organic compounds (VOCs) and analyzed pigments (chlorophylls, carotenoids) as well as phenolic compounds in Azolla filiculoides–T. azollae symbionts exposed to different light intensities. Our results revealed VOC emission mainly comprising isoprene and methanol (~82% and ~13% of the overall blend, respectively). In particular, by dissecting VOC emission from A. filiculoides and T. azollae, we found that the cyanobacterium does not emit isoprene, whereas it relevantly contributes to the methanol flux. Enhanced isoprene emission capacity (15.95 ± 2.95 nmol m−2 s−1), along with increased content of both phenolic compounds and carotenoids, was measured in A. filiculoides grown for long‐term under high (700 μmol m−2 s−1) rather than medium (400 μmol m−2 s−1) and low (100 μmol m−2 s−1) light intensity. Moreover, light‐responses of chlorophyll fluorescence demonstrated that A. filiculoides was able to acclimate to high growth light. However, exposure of A. filiculoides from low (100 μmol m−2 s−1) to very high light (1000 μmol m−2 s−1) did not affect, in the short term, photosynthesis, but slightly decreased isoprene emission and leaf pigment content whereas, at the same time, dramatically raised the accumulation of phenolic compounds (i.e. deoxyanthocyanidins and phlobaphenes). Our results highlight a coordinated photoprotection mechanism consisting of isoprene emission and phenolic compounds accumulation employed by A. filiculoides to cope with increasing light intensities.

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Changes in Pigment Composition and Photosynthetic Activity of Aquatic Fern (Azolla Microphylla Kaulf.) Exposed to Low Doses of UV-C (254 nm) Radiation

Cited by 15 publications

References 14 publications

The lampenflora in show caves and its treatment: an emerging ecological problem

The lampenflora in show caves and its treatment: an emerging ecological problem

Transcriptional Activation of Anthocyanin Biosynthesis in Developing Fruit of Blueberries (Vaccinium corymbosum L.) by Preharvest and Postharvest UV Irradiation

Exposure to different light intensities affects emission of volatiles and accumulations of both pigments and phenolics in Azolla filiculoides

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