Effects of natural solar UV-B radiation on three Arabidopsis accessions are strongly affected by seasonal weather conditions

Coffey, Aoife; Jansen, Marcel A. K.

doi:10.1016/j.plaphy.2018.06.016

Cited by 25 publications

(19 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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%

“…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). In the next sections we try to disentangle these possible mechanisms affecting epidermal UV absorbance and flavonoid accumulation seasonally.…”

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

confidence: 53%

See 1 more Smart Citation

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

et al. 2020

View full text Add to dashboard Cite

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.

show abstract

Section: Potential Interactions Of Seasonal Changes In Temperature Ansupporting

confidence: 78%

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

confidence: 53%

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

et al. 2020

View full text Add to dashboard Cite

show abstract

“…A decrease in UV-mediated induction of UV-absorbing compounds has been described under low-PAR conditions (Cen and Bornman, 1990; Gotz et al , 2010; Klem et al , 2012). More recently, Coffey et al , (2017) and Coffey and Jansen (2018) have reported an absence of induction of UV-absorbing compounds in Arabidopsis plants grown outdoors under different UV filters. Interestingly, these experiments were performed across different seasons in a temperate climatic area, i.e.…”

Section: Discussionmentioning

confidence: 99%

Ultraviolet radiation exposure time and intensity modulate tomato resistance to herbivory through activation of jasmonic acid signaling

Escobar‐Bravo

Chen

Kim

et al. 2018

Journal of Experimental Botany

View full text Add to dashboard Cite

show abstract

“…For instance, the lower flavonol accumulation among shade-intolerant species in the common-garden experiment than in the field may constitute a response to the relatively low irradiance, while the opposite pattern for the shade-tolerant species may be explained by the greater temperature fluctuations in the experiment and comparatively low irradiance in their native environment ( Figure S5). Since temperature interferes with photoreceptor responses known to be involved in leaf pigment accumulation (Coffey & Jansen, 2019;Pescheck & Bilger, 2019), the warmer temperatures in the common-garden experiment than that in the native habitat of these species might modulate some of these responses, particularly in the shade-tolerant species. If so, this may skew the pattern of results for shade-tolerant species, which may be more like those of shade-intolerant species, making the differences between the groups smaller.…”

Section: Differences In Plasticity To Spectral Regions Between Funcmentioning

confidence: 99%

Testing trait plasticity over the range of spectral composition of sunlight in forb species differing in shade tolerance

et al. 2020

View full text Add to dashboard Cite

Although sunlight is essential for plant growth and development, the relative importance of each spectral region in shaping functional traits is poorly understood, particularly in dynamic light environments such as forest ecosystems. We examined responses of 25 functional traits from groups of 11 shade‐intolerant and 12 understorey shade‐tolerant forb species grown outdoors under five filter treatments differing in spectral transmittance: (a) transmitting c. 95% of solar radiation (280–800 nm); (b) attenuating ultraviolet‐B (UV‐B); (c) attenuating all UV; (d) attenuating all UV and blue light; (e) attenuating all UV, blue and green light. Our results show that UV‐B radiation mainly affected the biochemical traits but blue light mainly affected the physiological traits irrespective of functional strategy, whereas green light affected both sets of traits. This would suggest that differentiation among suites of functional trait responses proceeds according to light quality. Biomass accumulation was significantly increased by UV‐A radiation (contrasting treatment [b] vs. [c]) among shade‐intolerant but decreased by blue light among shade‐tolerant species; green and red light affected whole‐plant morphological development differently according to functional groups. Shade‐tolerant species were more plastic than shade‐intolerant species in response to each spectral region that we examined except for UV‐B radiation. Synthesis. Our results show that differences in the spectral composition of sunlight can drive functional trait expression irrespective of total irradiance received. The different responses of functional traits between functional groups imply that shade‐tolerant and intolerant species have adapted to utilize spectral cues differently in their respective light environments.

show abstract

Effects of natural solar UV-B radiation on three Arabidopsis accessions are strongly affected by seasonal weather conditions

Cited by 25 publications

References 35 publications

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

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

Ultraviolet radiation exposure time and intensity modulate tomato resistance to herbivory through activation of jasmonic acid signaling

Testing trait plasticity over the range of spectral composition of sunlight in forb species differing in shade tolerance

Contact Info

Product

Resources

About