Hormone-controlled UV-B responses in plants

Vanhaelewyn, Lucas; Prinsen, Els; Straeten, Dominique Van Der; Vandenbussche, Filip

doi:10.1093/jxb/erw261

Cited by 121 publications

(98 citation statements)

References 164 publications

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“…Furthermore, CRYs and PHYs interact directly with AUX/IAA proteins, stabilizing them and thus inhibiting auxin signaling (Xu et al , ; Yang et al , 2018a). Auxin homeostasis is affected by UV‐B via photooxidative damage, degradation, biosynthesis, and conjugation (Vanhaelewyn et al , ). UV‐B‐activated UVR8 strongly attenuates thermomorphogenesis and shade avoidance through modulating PIF4 transcription and protein stability.…”

Section: Discussionmentioning

confidence: 99%

UV‐B photoreceptor UVR8 interacts with MYB73/MYB77 to regulate auxin responses and lateral root development

et al. 2019

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The UV-B photoreceptor UVR8 mediates multiple UV-B responses in plants, but the function of UVR8 in regulating root development has not previously been investigated. Here, we show that UV-B light inhibits Arabidopsis lateral root growth in a UVR8-dependent manner. Monomeric UVR8 inhibits auxin responses in a tissueautonomous manner and thereby regulates lateral root growth. Genome-wide gene expression analysis demonstrated that auxin and UV-B irradiation antagonistically regulate auxin-regulated gene expression. We further show that UVR8 physically interacts with MYB73/MYB77 (MYB DOMAIN PROTEIN 73/77) in a UV-Bdependent manner. UVR8 inhibits lateral root development via regulation of MYB73/MYB77. When activated by UV-B light, UVR8 localizes to the nucleus and inhibits the DNA-binding activities of MYB73/MYB77 and directly represses the transcription of their target auxin-responsive genes. Our results demonstrate that UV-B light and UVR8 are critical for both shoot morphogenesis and root development. The UV-B-dependent interaction of UVR8 and MYB73/MYB77 serves as an important module that integrates light and auxin signaling and represents a new UVR8 signaling mechanism in plants.

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Section: Discussionmentioning

confidence: 99%

UV‐B photoreceptor UVR8 interacts with MYB73/MYB77 to regulate auxin responses and lateral root development

et al. 2019

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“…). The latter include DNA damage signaling and defence and wound signaling pathways; MAP kinase activity, reactive oxygen species, salicylic acid, nitric oxide (NO), ethylene and jasmonic acid have all been implicated in UV‐B‐induced gene expression responses (A‐H‐Mackerness ; A‐H‐Mackerness et al ; Jenkins & Brown ; Jenkins ; Gonzalez Besteiro et al ; Tossi et al ; Hideg et al ; Vanhaelewyn et al ). Moreover, several plant hormone signaling pathways are involved in both UVR8‐mediated and non‐specific UV‐B responses (Vanhaelewyn et al ).…”

Section: Multiple Molecular Pathways Are Involved In Plant Responses mentioning

confidence: 99%

Photomorphogenic responses to ultraviolet‐B light

Jenkins

2017

Plant Cell & Environment

175

164

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“…Vanhaelewyn et al 122 concludes that the effects of UV-B on hormonal regulation can be roughly divided in two, inhibition of growthpromoting hormones (like CKs, GA and auxins) and the enhancement of environmental stress-induced defense hormones. In addition, CKs crosstalk with HY5 in regulating flavonoid biosynthesis, 123 suggesting that an interplay with UVR8 signalling may exist.…”

Section: Interaction Of Cytokinins With Uv-b Stressmentioning

confidence: 99%

Interaction of cytokinins with UV-B (280 -315nm) on the expansion growth of cucumber cotyledons

Kataria¹,

Kn²

2018

HIJ

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The negative effect on plant responses are expected due to increased amounts of ultraviolet-B (UV-B) radiation reaching on the Earth's surface by stratospheric ozone depletion. Cytokinins (CKs) are essential phytohormones in plant growth and development. Perusal of relevant literature reveals that CKs mitigate the oxidative damage caused by abiotic stresses like salt, drought, high temperature and heavy metal due to their antioxidant effects. However, very few reports are available on the interaction of CKs with UV-B stress on the expansion growth of the cucumber cotyledons. CKs induced the expansion growth of the excised cucumber cotyledons in the darkness. CKs induced expansion growth of cucumber cotyledons in darkness was inhibited by supplemental UV-B. UV-B radiation enhanced the level of oxyradicals like superoxide and hydroxide radicals in the excised cucumber cotyledons, which was evident by EPR spectroscopy. CKs like Zeatin, TDZ, BAP and FAP reduced the level of oxyradicals produced in the dark grown cucumber cotyledons, while promoting the expansion growth of the cotyledons. Production of oxyradical in UV-B exposed cotyledons showed that these oxyradicals might partially account for inhibition of expansion growth. Since considerable amount of oxyradicals were quenched by CKs at higher concentrations (10 and 20 µg/ml) it partially restores the inhibition of expansion growth caused by UV-B stress. It indicates that overproduction of oxyradicals by UV-B could not be entirely responsible for the inhibition of CKs induced expansion growth of cotyledons; which might be caused by some other physiological changes caused by UV-B irradiation in addition to the production of oxyradicals. UV-B is also known to inactivate protein inhibitor of peroxidase in cucumber cotyledons. This may reduce the antioxidants defence and enhance the damaging effects of oxyradicals for the growth of cotyledons.

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Hormone-controlled UV-B responses in plants

Cited by 121 publications

References 164 publications

UV‐B photoreceptor UVR8 interacts with MYB73/MYB77 to regulate auxin responses and lateral root development

UV‐B photoreceptor UVR8 interacts with MYB73/MYB77 to regulate auxin responses and lateral root development

Photomorphogenic responses to ultraviolet‐B light

Interaction of cytokinins with UV-B (280 -315nm) on the expansion growth of cucumber cotyledons

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