Photosynthetic response of mountain grassland species to drought stress is affected by UV-induced accumulation of epidermal flavonols

Rapantová, Barbora; Klem, Karel; Holub, Petr; Novotná, Kateřina; Urban, Otmar

doi:10.11118/beskyd201609010031

Cited by 4 publications

(5 citation statements)

References 29 publications

(28 reference statements)

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“…This variety includes gymnosperms and angiosperms and herbaceous species, shrubs and trees. Rapantová et al (2016) demonstrated species‐specific effects with UV amplifying negative effects of drought on bitter dock ( Rumex obtusifolius ) photosynthesis but ameliorating the same effect in common bent ( Agrostis capillaris ). This study revealed that negative impacts of drought and combinations of drought and UV (but not UV alone) on plant biomass were significantly greater for woody, compared to nonwoody plants (Figures ).…”

Section: Discussionmentioning

confidence: 99%

“…Interestingly, there were significant differences in the effects of UV on net carbon fixation, flavonoid content and biomass when UV exclusion studies were compared with supplementation studies (Figures ), suggesting a dose–response effect. Of the two field studies using natural UV radiation (i.e., exclusion approach), one showed particularly modest impacts of UV on photosynthesis (Rapantová et al, 2016), while the second reported a protective effect of UV‐B on drought‐stressed silver birch ( B. pendula ; Robson et al, 2015). Conversely, supplemental UV‐B or UV‐A did not alleviate the mild stress exerted by drought in pea ( Pisum sativum ) plants under outdoor conditions (Allen et al, 1999).…”

Section: Discussionmentioning

confidence: 99%

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A meta‐analysis of the interactive effects of UV and drought on plants

Jansen

Ač

Klem

et al. 2021

Plant Cell & Environment

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Interactions between climate change and UV penetration in the biosphere are resulting in the exposure of plants to new combinations of UV radiation and drought. In theory, the impacts of combinations of UV and drought may be additive, synergistic or antagonistic. Lack of understanding of the impacts of combined treatments creates substantial uncertainties that hamper predictions of future ecological change. Here, we compiled information from 52 publications and analysed the relative impacts of UV and/or drought. Both UV and drought have substantial negative effects on biomass accumulation, plant height, photosynthesis, leaf area and stomatal conductance and transpiration, while increasing stress‐associated symptoms such as MDA accumulation and reactive‐oxygen‐species content. Contents of proline, flavonoids, antioxidants and anthocyanins, associated with plant acclimation, are upregulated both under enhanced UV and drought. In plants exposed to both UV and drought, increases in plant defense responses are less‐than‐additive, and so are the damage and growth retardation. Less‐than‐additive effects were observed across field, glasshouse and growth‐chamber studies, indicating similar physiological response mechanisms. Induction of a degree of cross‐resistance seems the most likely interpretation of the observed less‐than‐additive responses. The data show that in future climates, the impacts of increases in drought exposure may be lessened by naturally high UV regimes.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

A meta‐analysis of the interactive effects of UV and drought on plants

Jansen

Ač

Klem

et al. 2021

Plant Cell & Environment

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“…In the present study, we found higher accumulation of BB in response to WD; however, we did not observe any significant change in R/S ratio in response to UV. Rapantová et al (2016) observed species‐specific differences in response to UV radiation in the same drought experiment. They found that UV radiation alleviated the negative impact of WD in A. capillaris , H. mollis , and H. maculatum , while the additive effect of UV was observed in R. obtusifolius in response to WD.…”

Section: Discussionmentioning

confidence: 96%

“…Flavonoids play an important role as antioxidants and can mitigate the oxidative stress induced by drought stress. Rapantová et al (2016) observed higher accumulation of flavonoids under the combined effect of WD and UV in grass as well as forbs.…”

Section: Discussionmentioning

confidence: 99%

Interactive effects of UV radiation and water deficit on production characteristics in upland grassland and their estimation by proximity sensing

Holub

Klem

Veselá

et al. 2022

Ecology and Evolution

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An increase in extreme weather and changes in other conditions associated with ongoing climate change are exposing ecosystems to a very wide range of environmental drivers that interact in ways which are not sufficiently understood. Such uncertainties in how ecosystems respond to multifactorial change make it difficult to predict the impacts of environmental change on ecosystems and their functions. Since water deficit (WD) and ultraviolet radiation (UV) trigger similar protective mechanisms in plants, we tested the hypothesis that UV modulates grassland acclimation to WD, mainly through changes in the root/shoot (R/S) ratio, and thus enhances the ability of grassland to acquire water from the soil and hence maintain its productivity. We also tested the potential of spectral reflectance and thermal imaging for monitoring the impacts of WD and UV on grassland production parameters. The experimental plots were manipulated by lamellar shelters allowing precipitation to pass through or to be excluded. The lamellas were either transmitting or blocking the UV. The results show that WD resulted in a significant decrease in aboveground biomass (AB). In contrast, belowground biomass (BB), R/S ratio, and total biomass (TB) increased significantly in response to WD, especially in UV exclusion treatment. UV exposure had a significant effect on AB and BB, but only in the last year of the experiment. The differences in the effect of WD between years show that the effect of precipitation removal is largely influenced by the potential evapotranspiration (PET) in a given year and hence mainly by air temperatures, while the resulting effect on production parameters is best correlated with the water balance given by the difference between precipitation and PET. Canopy temperature and selected spectral reflectance indices showed a significant response to WD and also significant relationships with morphological (AB, R/S) and biochemical (C/N ratio) parameters. In particular, the vegetation indices NDVI and RDVI provided the best correlations of biomass changes caused by WD and thus the highest potential to remotely sense drought effects on terrestrial vegetation.

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“…Further research can be paramount in deepening our understanding of these stress responses, leading to potential applications in plant resilience and agricultural sustainability.4 | DISCUSSION AND FUTURE IMPLICATIONSA comprehensive examination of prior research reveals a collection of both short-term and long-term studies conducted on a wide range of plant species, encompassing gymnosperms, angiosperms, herbaceous plants, shrubs, and trees. For instance, Rapantová et al(Rapantová et al, 2017) identified species-specific effects, where UV radiation exacerbated the negative impacts of drought on the photosynthesis of Rumex obtusifolius, yet it mitigated similar effects in Agrostis capillaris. Moreover, research indicates that the adverse effects of drought and the combined impacts of drought and UV (excluding the influence of UV alone) on plant biomass were significantly more pronounced in woody plants compared to non-woody plants.…”

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confidence: 99%

Potential of UV‐B radiation in drought stress resilience: A multidimensional approach to plant adaptation and future implications

Shoaib,

Pan,

Mughal

et al. 2023

Plant Cell & Environment

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The escalating impact of climate change and ultraviolet (UV) radiation is subjecting plants to unique combinations of UV‐B and drought stress. These combined stressors could have additive, synergistic, or antagonistic effects, but the precise nature of these impacts remains uncertain, hampering our ability to predict plant adaptations approach towards stressors. Our analysis of various studies shows that UV‐B or drought conditions detrimentally influence plant growth and health metrics by the enhanced generation of reactive oxygen species causing damage to lipids, proteins, carbohydrates and DNA. Further reducing biomass accumulation, plant height, photosynthetic efficiency, leaf area, and water transpiration, while enhancing stress‐related symptoms. In response to UV‐B radiation and drought stress, plants exhibit a notable up‐regulation of specific acclimation‐associated metabolites, including proline, flavonoids, anthocyanins, unsaturated fatty acids, and antioxidants. These metabolites play a pivotal role in conferring protection against environmental stresses. Their biosynthesis and functional roles are potentially modulated by signalling molecules such as hydrogen peroxide, abscisic acid, jasmonic acid, salicylic acid, and ethylene, all of which have associated genetic markers that further elucidate their involvement in stress response pathways. In comparison to single stress, the combination of UV‐B and drought induces the plant defence responses and growth retardation which are less‐than‐additive. This sub‐additive response, consistent across different study environments, suggests the possibility of a cross‐resistance mechanism. Our outlines imply that the adverse effects of increased drought and UV‐B could potentially be mitigated by cross‐talk between UV‐B and drought regimes utilizing a multidimensional approach. This crucial insight could contribute significantly to refining our understanding of stress tolerance in the face of ongoing global climate change.

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Photosynthetic response of mountain grassland species to drought stress is affected by UV-induced accumulation of epidermal flavonols

Cited by 4 publications

References 29 publications

A meta‐analysis of the interactive effects of UV and drought on plants

A meta‐analysis of the interactive effects of UV and drought on plants

Interactive effects of UV radiation and water deficit on production characteristics in upland grassland and their estimation by proximity sensing

Potential of UV‐B radiation in drought stress resilience: A multidimensional approach to plant adaptation and future implications

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