The UV-B Photoreceptor UVR8: From Structure to Physiology

Jenkins, Gareth I.

doi:10.1105/tpc.113.119446

Cited by 279 publications

(239 citation statements)

References 112 publications

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“…g085050 (herein referred to as Cr-COP1; previously also described as PUTATIVE LIGHT RESPONSE SIGNALING PROTEIN1 [LRS1]; Schierenbeck et al, 2015). The identification of Cr-COP1 further suggests the presence of a conserved UV-B signaling pathway similar to the known pathway in Arabidopsis (Heijde and Ulm, 2012;Li et al, 2013;Tilbrook et al, 2013;Jenkins, 2014). Cr-UVR8 and Cr-COP1 cDNAs were cloned and verified to match their respective sequence annotations.…”

Section: Structural Conservation and Uv-b Dynamics Of Chlamydomonas Uvr8mentioning

confidence: 99%

“…UV-B activation of UVR8 initiates a molecular signaling cascade leading to UV-B acclimation and the ability to tolerate constant UV-B exposure (Kliebenstein et al, 2002;Li et al, 2013;Tilbrook et al, 2013;Jenkins, 2014). Briefly, the UVR8 homodimer monomerizes upon UV-B exposure and interacts with CONSTITUTIVELY PHOTOMORPHOGENIC1 (COP1) (Oravecz et al, 2006;Favory et al, 2009;Rizzini et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

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UV-B Perception and Acclimation in Chlamydomonas reinhardtii

et al. 2016

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Plants perceive UV-B, an intrinsic component of sunlight, via a signaling pathway that is mediated by the photoreceptor UV RESISTANCE LOCUS8 (UVR8) and induces UV-B acclimation. To test whether similar UV-B perception mechanisms exist in the evolutionarily distant green alga Chlamydomonas reinhardtii, we identified Chlamydomonas orthologs of UVR8 and the key signaling factor CONSTITUTIVELY PHOTOMORPHOGENIC1 (COP1). Cr-UVR8 shares sequence and structural similarity to Arabidopsis thaliana UVR8, has conserved tryptophan residues for UV-B photoreception, monomerizes upon UV-B exposure, and interacts with Cr-COP1 in a UV-B-dependent manner. Moreover, Cr-UVR8 can interact with At-COP1 and complement the Arabidopsis uvr8 mutant, demonstrating that it is a functional UV-B photoreceptor. Chlamydomonas shows apparent UV-B acclimation in colony survival and photosynthetic efficiency assays. UV-B exposure, at low levels that induce acclimation, led to broad changes in the Chlamydomonas transcriptome, including in genes related to photosynthesis. Impaired UV-B-induced activation in the Cr-COP1 mutant hit1 indicates that UVR8-COP1 signaling induces transcriptome changes in response to UV-B. Also, hit1 mutants are impaired in UV-B acclimation. Chlamydomonas UV-B acclimation preserved the photosystem II core proteins D1 and D2 under UV-B stress, which mitigated UV-B-induced photoinhibition. These findings highlight the early evolution of UVR8 photoreceptor signaling in the green lineage to induce UV-B acclimation and protection.

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Section: Structural Conservation and Uv-b Dynamics Of Chlamydomonas Uvr8mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

UV-B Perception and Acclimation in Chlamydomonas reinhardtii

et al. 2016

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Section: Effects Of Uv-b In Plantsmentioning

confidence: 99%

“…Solar radiation not only includes the visible spectrum (400-700 nm) necessary for photosynthesis, but also other types of radiation. Near 7% of the electromagnetic radiation emitted by the Sun is within the ultraviolet radiation (UVR) spectrum (200-400 nm) [128][129][130]. UVR has been divided into three different bands: UV-A (315-400 nm), UV-B (280-315 nm) and UV-C (200-280 nm) [130,131].…”

Section: Solar Ultraviolet B Levels Ozone Layer Depletion and Increamentioning

confidence: 99%

“…The UV-B radiation has several detrimental effects but it also serves as a key regulator of plant morphology and physiological, biochemical and genetic mechanisms [127,129,133,134]. Plants actively respond to irradiation with high or low UV-B doses, either by the activation of repair mechanisms or by stimulation of photomorphogenic processes [128,129]. In general, low UV-B doses reduces growth and expansion of leaves, produces leaf thickness, increases epicuticular waxes, trichomes number and axillary branching, reduces stem elongation, suppresses both hypocotyl extension and root growth and enhances flavonoid biosynthesis, mostly flavonol [127-129, 132, 134].…”

Section: Effects Of Uv-b In Plantsmentioning

confidence: 99%

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Grapevine Biotechnology: Molecular Approaches Underlying Abiotic and Biotic Stress Responses

Armijo¹,

Espinoza²,

Loyola³

et al. 2016

Grape and Wine Biotechnology

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Grapevine is one of the most abundant crops worldwide, with varieties destined for fresh and dry consumption, as well as wine production. Unfortunately, grapevine plants are affected by both biotic and abiotic stresses, generating significant economic losses. These conditions can negatively impact grape cultivation at different stages: plant and berry development during pre-and post-harvest, production, fresh fruit processing and export, along with wine quality. Most of the grapevine varieties are susceptible to several pathogens and within this chapter, particular attention is given to fungi (Botrytis cinerea and Erysiphe necator) and viruses, since they are a worldwide concern. Within the latter, special focus is given to the grapevine leafroll disease, a complex and destructive infection. On the other hand, abiotic stress is also relevant in grapevine, and in this chapter it will be exemplified by UV-B radiation and its impact on growth and fruit development, plant adaptive responses and its relationship with the quality of grape berries for winemaking. The main biotic and abiotic grapevine stress factors are reviewed in this chapter, considering a special focus on biotechnological approaches carried out in order to address them and minimize their detrimental consequences.

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Cryptochromes: How Blue Light Perception Influences Plant Physiology

Fantini

Facella

2020

Encyclopedia of Life Sciences

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Light plays a pivotal role in several physiological processes during plant growth, development and adaptation. Plants sense and respond to fluctuating light conditions using various photoreceptors such as phytochromes, cryptochromes and phototropins. In particular, cryptochromes are able to monitor, capture and transmit the stimuli of UVA/blue light in order to promote photomorphogenesis and regulate many aspects of plant development and growth including seed germination and seedling de‐etiolation, flowering induction, circadian rhythms and stress responses. Cryptochromes influence all these processes by modulating the expression pattern of several genes; such massive regulation is fundamental for optimising all physiological properties of plants throughout their life cycle. Key Concepts Light is essential for plant life. Plants use photoreceptors to sense and monitor quality, direction, intensity and length of light stimulus. Cryptochromes play fundamental roles in plant development. Cryptochromes are highly conserved among plant species. Cryptochromes regulate many light‐dependent physiological processes.

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The UV-B Photoreceptor UVR8: From Structure to Physiology

Cited by 279 publications

References 112 publications

UV-B Perception and Acclimation in Chlamydomonas reinhardtii

UV-B Perception and Acclimation in Chlamydomonas reinhardtii

Grapevine Biotechnology: Molecular Approaches Underlying Abiotic and Biotic Stress Responses

Cryptochromes: How Blue Light Perception Influences Plant Physiology

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