The UVB photoreceptor UVR8 mediates accumulation of UV‐absorbing pigments, but not changes in plant morphology, under outdoor conditions

Coffey, Aoife; Prinsen, Els; Jansen, Marcel A. K.; Conway, James F.

doi:10.1111/pce.13025

Cited by 56 publications

(41 citation statements)

References 56 publications

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“…The reduction of maximum plant expansion, as well as an overall increase of leaf phenolic concentrations due to solar UV radiation across both ranges confirms previously observed changes in plant morphology and leaf compounds in response to UV radiation (Suchar and Robberecht , Coffey et al. ). However, it is most notable that these effects were consistent across multiple species, origins and in different regions.…”

Section: Discussionsupporting

confidence: 89%

Exotic plant species are locally adapted but not to high ultraviolet‐B radiation: a reciprocal multispecies experiment

Hock

Hofmann

Müller

et al. 2019

Ecology

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Ultraviolet (UV) radiation intensities differ among global regions, with significantly higher levels in the southern hemisphere. UV‐B may act as an environmental filter during plant invasions, which might particularly apply to plant species from Europe introduced to New Zealand. Just like for any other abiotic or biotic filter, successful invaders can cope with novel environmental conditions via plastic responses and/or through rapid adaptation by natural selection in the exotic range. We conducted a multispecies experiment with herbaceous plants in two common gardens located in the species’ native and exotic ranges, in Germany and New Zealand, respectively. We used plants of German and New Zealand origin of eight species to test for adaptation to higher UV‐B radiation in their new range. In each common garden, all plants were exposed to three radiation treatments: (1) ambient sunlight, (2) exclusion of UV‐B while transmitting ambient UV‐A, and (3) combined exclusion of UV‐B and UV‐A. Linear mixed‐effect models revealed significant effects of UV‐B on growth and leaf traits and an indication for UV‐B‐induced biomass reduction in both common gardens pointing to an impact of natural, ambient UV radiation intensities experienced by plants in the northern and in the southern hemisphere. In both common gardens, the respective local plants (i.e., German origins in Germany, New Zealand origins in New Zealand) displayed enhanced productivity and aboveground biomass allocation, thus providing evidence for recent evolutionary processes in the exotic range. Genetic differentiation between different origins in consequence of divergent local selection pressures was found for specific leaf area. This differentiation particularly hints at different selective forces in both ranges while only little evidence was found for an immediate selective effect of high UV‐B intensities in the exotic range. However, reaction norm slopes across ranges revealed higher plasticity of exotic individuals in functional leaf traits that might allow for a more sensitive regulation of photoprotection measures in response to UV‐B. During the colonization, New Zealand populations might have been selected for the observed higher phenotypic plasticity and a consequently increased ability to successfully spread in the exotic range.

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Section: Discussionsupporting

confidence: 89%

Exotic plant species are locally adapted but not to high ultraviolet‐B radiation: a reciprocal multispecies experiment

Hock

Hofmann

Müller

et al. 2019

Ecology

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“…The seasonal I flav trend for higher values in spring and autumn, is likely partly explained by low temperatures experienced by understorey species in these periods. Our I flav trends resembled the seasonal patterns in flavonoids attributed to temperature in an outdoor experiment attenuating UV radiation from different Arabidopsis accessions and genotypes (Coffey et al, 2017;Coffey and Jansen, 2019). Earlier studies have found changes in epidermal UV-transmittance at moderate temperatures ranging from + 9 to 21°C (Bilger et al, 2007), which likely falls within the range of summertime fluctuations in the stands we studied (e.g.…”

Section: Potential Interactions Of Seasonal Changes In Temperature Ansupporting

confidence: 78%

“…czerepanovii growing close to the treeline followed a seasonal time-course from bud burst to senescence (Riipi et al, 2002). Similarly, seasonal changes in the short-term accumulation of flavonoids in Arabidopsis were also found to persist even when UV was attenuated (Coffey et al, 2017). The trends reported in these studies and ours all point to other environmental factors or developmental processes that co-vary seasonally with UV radiation also being implicated in driving trends in flavonoids (Liakoura et al, 2001;Kotilainen et al, 2010;Nenadis et al, 2015;Coffey and Jansen, 2019).…”

Section: Does Uv Radiation Explain the Trends In I Flav ?supporting

confidence: 69%

“…In line with this, previous studies suggest plants rarely experience severe damage due to UV-B radiation in nature (Paul and Gwynn-Jones, 2003). Furthermore, low UV radiation might provide cross-tolerance to high UV-B radiation (Hideg et al, 2013;Coffey et al, 2017), or high solar irradiance in general (Klem et al, 2015), which might be beneficial during infrequent high irradiance sunflecks or sunpatches.…”

Section: Effect Of Transient Light In the Understorey On Trends In I mentioning

confidence: 99%

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Seasonal Patterns in Spectral Irradiance and Leaf UV-A Absorbance Under Forest Canopies

et al. 2020

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Plants commonly respond to UV radiation through the accumulation of flavonoids and related phenolic compounds which potentially ameliorate UV-damage to crucial internal structures. However, the seasonal dynamics of leaf flavonoids corresponding to epidermal UV absorbance is highly variable in nature, and it remains uncertain how environmental factors combine to govern flavonoid accumulation and degradation. We studied leaf UV-A absorbance of species composing the understorey plant community throughout two growing seasons under five adjacent tree canopies in southern Finland. We compared the relationship between leaf flavonol index (I flav -repeatedly measured with an optical leaf clip Dualex) and measured spectral irradiance, understorey and canopy phenology, air temperature and snowpack variables, whole leaf flavonoid extracts, and leaf age. Strong seasonal patterns and stand-related differences were apparent in I flav of both understorey plant communities and individual species, including divergent trends in I flav during spring and autumn. Comparing the heterogeneity of the understorey light environment and its spectral composition in looking for potential drivers of seasonal changes in I flav , we found that unweighted UV-A irradiance, or the effective UV dose calculated according to the biological spectral weighting function (BSWF) for plant growth (PG action spectrum), in understorey shade had a strong relationship with I flav . Furthermore, understorey species seemed to adjust I flav to low background diffuse irradiance rather than infrequent high direct-beam irradiance in sunflecks during summer, since leaves produced during or after canopy closure had low I flav . In conclusion, we found the level of epidermal flavonoids in forest understorey species to be plastic, adjusting to climatic conditions, and differing according to species' leaf retention strategy and new leaf production, all of which contribute to the seasonal trends in leaf flavonoids found within forest stands.

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“…Similarly, a study using higher UV‐A irradiance on barley ( Hordeum vulgare ) found no significant effect on F v /F m (Štroch et al ). However, under unshaded conditions, solar UV‐A radiation has been reported to decrease F v /F m in the Arabidopsis mutant uvr8‐1 (Coffey et al ). Increases in F v /F m for plants that have been cultivated under BL have been reported in many plant species (Goins et al , Matsuda et al , Terfa et al , Hoffmann et al ), yet to our knowledge this is the first study of the effects of BL on ϕ PSII and F v /F m to compare differences among Arabidopsis photoreceptor mutants cry1 cry2, phot1 and uvr8‐2 .…”

Section: Discussionmentioning

confidence: 99%

Do UV‐A radiation and blue light during growth prime leaves to cope with acute high light in photoreceptor mutants ofArabidopsis thaliana?

Brelsford

Morales

Nezval

et al. 2018

Physiologia Plantarum

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We studied how plants acclimated to growing conditions that included combinations of blue light (BL) and ultraviolet (UV)-A radiation, and whether their growing environment affected their photosynthetic capacity during and after a brief period of acute high light (as might happen during an under-canopy sunfleck). Arabidopsis thaliana Landsberg erecta wild-type were compared with mutants lacking functional blue light and UV photoreceptors: phototropin 1, cryptochromes (CRY1 and CRY2) and UV RESISTANT LOCUS 8 (uvr8). This was achieved using light-emitting-diode (LED) lamps in a controlled environment to create treatments with or without BL, in a split-plot design with or without UV-A radiation. We compared the accumulation of phenolic compounds under growth conditions and after exposure to 30 min of high light at the end of the experiment (46 days), and likewise measured the operational efficiency of photosystem II (ϕPSII, a proxy for photosynthetic performance) and dark-adapted maximum quantum yield (F /F to assess PSII damage). Our results indicate that cryptochromes are the main photoreceptors regulating phenolic compound accumulation in response to BL and UV-A radiation, and a lack of functional cryptochromes impairs photosynthetic performance under high light. Our findings also reveal a role for UVR8 in accumulating flavonoids in response to a low UV-A dose. Interestingly, phototropin 1 partially mediated constitutive accumulation of phenolic compounds in the absence of BL. Low-irradiance BL and UV-A did not improve ϕPSII and F /F upon our acute high-light treatment; however, CRYs played an important role in ameliorating high-light stress.

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The UVB photoreceptor UVR8 mediates accumulation of UV‐absorbing pigments, but not changes in plant morphology, under outdoor conditions

Cited by 56 publications

References 56 publications

Exotic plant species are locally adapted but not to high ultraviolet‐B radiation: a reciprocal multispecies experiment

Exotic plant species are locally adapted but not to high ultraviolet‐B radiation: a reciprocal multispecies experiment

Seasonal Patterns in Spectral Irradiance and Leaf UV-A Absorbance Under Forest Canopies

Do UV‐A radiation and blue light during growth prime leaves to cope with acute high light in photoreceptor mutants ofArabidopsis thaliana?

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