Epidermal UVA screening capacity measured in situ as an indicator of light acclimation state of leaves of a very plastic alpine plant Soldanella alpina L.

Bidel, Luc; Meyer, Sylvie; Talhouët, Anne-Claire; Baudin, Xavier; Daniel, Caroline; Cazals, Guillaume; Streb, Peter

doi:10.1016/j.plaphy.2020.02.045

Cited by 5 publications

(5 citation statements)

References 39 publications

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“…It is interesting that VAZ and α-toc pools correlated negatively with each other (Pearson correlation coefficient = 0.971, P < 0.05, Figure S5), suggesting a functional redundancy within the photosynthetic tissue, as has been described in Arabidopsis thaliana mutants (Havaux et al, 2005). In contrast to the pattern shown by antioxidant molecules in the present study (Figure 4), it has been reported that the antioxidant enzymes of S. alpina increase their activity rapidly after snow melting (Streb et al, 1997) and that its foliar carotenoids and UV-absorbent flavonoids increase after the shade to sun transfer (Bidel et al, 2020). With the exception of H. alpina, passive filters such as anthocyanins and flavonoid glycosides in overwintering leaves also decreased after emerging from snow (Figure 4) and this may be associated with the small drop in UV absorptance once the snow had melted.…”

Section: Trends In Photoprotection With Time After Snowmeltcontrasting

confidence: 49%

Alpine forbs rely on different photoprotective strategies during spring snowmelt

Fernández‐Marín

Sáenz-Ceniceros

Solanki

et al. 2021

Physiologia Plantarum

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Snowmelt in alpine ecosystems brings ample water, and together with above-freezing temperatures, initiates plant growth. In this scenario, rapid activation of photosynthesis is essential for a successful life-history strategy. But, strong solar radiation in late spring enhances the risk of photodamage, particularly before photosynthesis is fully functional. We compared the photoprotective strategy of five alpine forbs: one geophyte not particularly specialised in subnival life (Crocus albiflorus) and four wintergreens differing in their degree of adaptation to subnival life, from least to most specialised: Gentiana acaulis, Geum montanum, Homogyne alpina and Soldanella alpina.We used distance to the edge of snow patches as a proxy to study time-dependent changes after melting. We postulated that the photoprotective response of snowbed

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Section: Trends In Photoprotection With Time After Snowmeltcontrasting

confidence: 49%

Alpine forbs rely on different photoprotective strategies during spring snowmelt

Fernández‐Marín

Sáenz-Ceniceros

Solanki

et al. 2021

Physiologia Plantarum

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“…Figure S6). This contrasts with earlier findings of reduced amounts of HCAs under full‐spectrum sunlight (Bidel et al 2020; Morales et al 2013). The reported leaf area‐based variability of HCA amounts was not confounded by changes in the leaf morphology because the specific leaf area remained relatively constant while HCAs increased in autumn (Figure S2B).…”

Section: Discussioncontrasting

confidence: 99%

“…Some long‐lived ROS like H 2 O 2 might also be detoxified at more dislocated sites. In vivo fluorescence imaging (e.g., Agati et al 2007; Böttner et al 2020; Hutzler et al 1998), and measurements of epidermal UV transmission (e.g., Bidel et al 2020; Bilger et al 1997; Day et al 1992; Markstädter et al 2001) revealed that phenylpropanoids are often predominantly accumulated in the vacuoles of the upper epidermis and could therefore screen UV radiation (Barnes et al 2015). However, there are some examples of an accumulation of flavonoids in the palisade parenchyma, such as of Phillyrea latifolia and Ligustrum vulgare , and even in chloroplasts, which indicates an improvement of the antioxidant capacity in these cells (Agati et al 2007; Agati et al 2009; Agati et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Solar UV‐B effects on composition and UV screening efficiency of foliar phenolics in Arabidopsis thaliana are augmented by temperature

Nichelmann

Pescheck

2021

Physiologia Plantarum

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The accumulation of foliar phenolics constitutes one strategy of plants against the potentially harmful effects of ultraviolet-B and A (UV-B, UV-A) radiation. These compounds protect photosensitive tissues by shielding and antioxidative function. It is unknown, however, whether seasonal acclimation to natural conditions may modify the UV-B effect on phenylpropanoid composition and localisation, and thus their screening efficiency. To address this debate, a field experiment with the wildtype of Arabidopsis thaliana accession Landsberg erecta (Ler) was implemented over a whole year with plants exposed to different UV-filter treatments. While seasonal increases of UV-B radiation had a slight negative effect on the amount of hydroxycinnamic acids (HCAs), low temperatures increased foliar HCAs. HCAs, however, did not contribute substantially to seasonal changes of in vivo UV absorbance. Kaempferol and quercetin derivatives increased significantly under ambient UV-B radiation, and low temperature interacted with this effect. A shift of epidermal UV-A shielding from kaempferol to quercetin derivatives was elucidated in UV-B presence. Despite this, a substantial 20-fold increase of quercetin derivatives, during periods with high irradiance and low temperature, did not affect UV absorbance leading to the conclusion that quercetin accumulation was not exclusively in epidermal vacuoles. Using confocal microscopy, the potential occurrence of quercetin in mesophyll cells was demonstrated in plants grown with experimental UV-B radiation at low temperature for the first time in A. thaliana. The presented study discusses the idea that cross-talk of UV-B radiation and temperature might adjust the physiological function of quercetin from an (epidermal) screening to an antioxidant substance. | INTRODUCTIONPlants rely on diverse mechanisms to attain resistance against the potentially deleterious effects of ultraviolet-A and B radiation (UV-A: 315-400 nm, UV-B: 280-315 nm). Among others, the accumulation of phenolic compounds is one important strategy. However, there is an ongoing debate about the major function of foliar phenolic compounds (reviewed in Winkel-Shirley 2002;Agati et al. 2020). Strong arguments support the idea that these aromatic substances have a dual function in leaves: they are antioxidants on the one hand

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“…hydroxycinnamic acid derivatives) screen UV radiation in plant tissues and are therefore central to plant UV-acclimation responses. The accumulation of these compounds in leaves, flower petals and pollen is temperature dependent but is also driven by UV-B radiation [ 135 , 175 , 176 ]. Flavonoids fulfil many additional roles in plants, in that they are involved in ameliorating biotic and abiotic environmental-stress, regulating the transport of certain hormones (i.e.…”

Section: Effects Of Uv Radiation and Climate Interactions On Plants A...mentioning

confidence: 99%

Interactive effects of changes in UV radiation and climate on terrestrial ecosystems, biogeochemical cycles, and feedbacks to the climate system

Barnes

Robson

Zepp

et al. 2023

Photochem Photobiol Sci

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Terrestrial organisms and ecosystems are being exposed to new and rapidly changing combinations of solar UV radiation and other environmental factors because of ongoing changes in stratospheric ozone and climate. In this Quadrennial Assessment, we examine the interactive effects of changes in stratospheric ozone, UV radiation and climate on terrestrial ecosystems and biogeochemical cycles in the context of the Montreal Protocol. We specifically assess effects on terrestrial organisms, agriculture and food supply, biodiversity, ecosystem services and feedbacks to the climate system. Emphasis is placed on the role of extreme climate events in altering the exposure to UV radiation of organisms and ecosystems and the potential effects on biodiversity. We also address the responses of plants to increased temporal variability in solar UV radiation, the interactive effects of UV radiation and other climate change factors (e.g. drought, temperature) on crops, and the role of UV radiation in driving the breakdown of organic matter from dead plant material (i.e. litter) and biocides (pesticides and herbicides). Our assessment indicates that UV radiation and climate interact in various ways to affect the structure and function of terrestrial ecosystems, and that by protecting the ozone layer, the Montreal Protocol continues to play a vital role in maintaining healthy, diverse ecosystems on land that sustain life on Earth. Furthermore, the Montreal Protocol and its Kigali Amendment are mitigating some of the negative environmental consequences of climate change by limiting the emissions of greenhouse gases and protecting the carbon sequestration potential of vegetation and the terrestrial carbon pool. Graphical abstract

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Epidermal UVA screening capacity measured in situ as an indicator of light acclimation state of leaves of a very plastic alpine plant Soldanella alpina L.

Cited by 5 publications

References 39 publications

Alpine forbs rely on different photoprotective strategies during spring snowmelt

Alpine forbs rely on different photoprotective strategies during spring snowmelt

Solar UV‐B effects on composition and UV screening efficiency of foliar phenolics in Arabidopsis thaliana are augmented by temperature

Interactive effects of changes in UV radiation and climate on terrestrial ecosystems, biogeochemical cycles, and feedbacks to the climate system

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