UV-B Perception and Signal Transduction

Jenkins, Gareth I.; Brown, Bobby A.

doi:10.1002/9780470988893.ch7

Cited by 37 publications

(5 citation statements)

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“…In this study, we monitored the transcript levels of eight BBX genes in apple and found that the expression of MdBBX20 was significantly induced by UV-B. Photomorphogenic responses to UV-B are mediated by the UV-B-specific photoreceptor UVR8 and many key regulatory factors, such as HY5, BBX24, and COP1 (Jenkins & Brown, 2007;Kliebenstein & Jenkins, 2005;Oravecz et al, 2006;Ulm & Nagy, 2005). BBX24 responds to UV-B signalling and forms an inactive heterodimer with HY5.…”

Section: Mdbhlh3 Binds To the Ltr Cis Element In The Mdbbx20 Promotermentioning

confidence: 99%

The B‐box zinc finger protein MdBBX20 integrates anthocyanin accumulation in response to ultraviolet radiation and low temperature

Fang

Dong

Yue

et al. 2019

Plant Cell & Environment

134

110

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Ultraviolet‐B (UV‐B) radiation and low temperature promote the accumulation of anthocyanins, which give apple skins their red colour. Although many transcription regulators have been characterized in the UV‐B and low‐temperature pathways, their interregulation and synergistic effects are not well understood. Here, a B‐box transcription factor gene, MdBBX20, was characterized in apple and identified to promote anthocyanin biosynthesis under UV‐B conditions in field experiments and when overexpressed in transgenic apple calli. The transcript level of MdBBX20 was significantly induced by UV‐B. Specific G‐box elements in the promoters of target genes were identified as interaction sites for MdBBX20. Further experimental interrogation of the UV‐B signalling pathways showed that MdBBX20 could interact with MdHY5 in vitro and in vivo and that this interaction was required to significantly enhance the promoter activity of MdMYB1. MdBBX20 also responded to low temperature (14°C) with the participation of MdbHLH3, which directly bound a low temperature‐response cis elements in the MdBBX20 promoter. These findings demonstrate the molecular mechanism by which MdBBX20 integrates low‐temperature‐ and UV‐B‐induced anthocyanin accumulation in apple skin.

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Section: Mdbhlh3 Binds To the Ltr Cis Element In The Mdbbx20 Promotermentioning

confidence: 99%

The B‐box zinc finger protein MdBBX20 integrates anthocyanin accumulation in response to ultraviolet radiation and low temperature

Fang

Dong

Yue

et al. 2019

Plant Cell & Environment

134

110

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“…Ultraviolet‐B (UV‐B; 280–315 nm) radiation is an integral part of the sunlight reaching the surface of the Earth and induces a broad range of physiological responses. The UV‐B‐induced photomorphogenic responses, in contrast to damage responses, are thought to be mediated by a molecularly unidentified UV‐B‐specific photoreceptor different from the known receptors acting in the visible part of the light spectrum (Brosche and Strid, 2003; Frohnmeyer and Staiger, 2003; Ulm and Nagy, 2005; Jenkins and Brown, 2007). Key regulatory factors involved in the UV‐B‐induced photomorphogenic pathway, such as the bZIP transcription factor ELONGATED HYPOCOTYL 5 (HY5), the E3 ubiquitin ligase CONSTITUTIVELY PHOTOMORPHOGENIC 1 (COP1) and the seven‐bladed propeller protein UV RESPONSE LOCUS 8 (UVR8), have been identified and plants harbouring hy5 , cop1 and uvr8 loss of function mutations display reduced tolerance to UV‐B stress (Kliebenstein et al , 2002; Ulm et al , 2004; Brown et al , 2005; Oravecz et al , 2006).…”

Section: Introductionmentioning

confidence: 99%

Interaction of COP1 and UVR8 regulates UV-B-induced photomorphogenesis and stress acclimation in Arabidopsis

Favory

Stec

Gruber

et al. 2009

EMBO J

568

1,000

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The ultraviolet-B (UV-B) portion of the solar radiation functions as an environmental signal for which plants have evolved specific and sensitive UV-B perception systems. The UV-B-specific UV RESPONSE LOCUS 8 (UVR8) and the multifunctional E3 ubiquitin ligase CONSTITUTIVELY PHOTOMORPHOGENIC 1 (COP1) are key regulators of the UV-B response. We show here that uvr8-null mutants are deficient in UV-B-induced photomorphogenesis and hypersensitive to UV-B stress, whereas overexpression of UVR8 results in enhanced UV-B photomorphogenesis, acclimation and tolerance to UV-B stress. By using sun simulators, we provide evidence at the physiological level that UV-B acclimation mediated by the UV-B-specific photoregulatory pathway is indeed required for survival in sunlight. At the molecular level, we demonstrate that the wild type but not the mutant UVR8 and COP1 proteins directly interact in a UV-B-dependent, rapid manner in planta. These data collectively suggest that UV-B-specific interaction of COP1 and UVR8 in the nucleus is a very early step in signalling and responsible for the plant's coordinated response to UV-B ensuring UV-B acclimation and protection in the natural environment.

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“…Thus, it is critical for plants to appropriately detect, coordinate, and respond to light cues for their overall fitness and survival. To perceive light, plants have evolved different classes of photoreceptors that absorb light wavelengths from the UV to far-red (380-735 nm wavelengths), including UV RESISTANCE LOCUS 8 (UVR8), PHOTOTROPINS, CRYPTOCHROMES, LOV (Light, Oxygen, Voltage)-KELCH DOMAIN containing F-box proteins, and PHYTOCHROMES (Butler et al, 1959;Gressel, 1979;Kandori et al, 1992;Jansen et al, 1998;Briggs and Huala, 1999;Cashmore et al, 1999;Lin, 2000;Nelson et al, 2000;Somers et al, 2000;Briggs et al, 2001;Jarillo et al, 2001;Kinoshita et al, 2001;Kagawa et al, 2001;Sakai et al, 2001;Schultz et al, 2001;Briggs and Christie, 2002;Kasahara et al, 2002;Lin, 2002;Frohnmeyer and Staiger, 2003;Imaizumi et al, 2003;Kleine et al, 2003;Ulm and Nagy, 2005;Kaiserli and Jenkins, 2007;Quail, 2010;Yu et al, 2010;Chaves et al, 2011;Rizzini et al, 2011;Jenkins and Brown, 2018).…”

Section: Introductionmentioning

confidence: 99%

Out of the Dark and Into the Light: A New View of Phytochrome Photobodies

Pardi

Nusinow

2021

Front. Plant Sci.

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Light is a critical environmental stimulus for plants, serving as an energy source via photosynthesis and a signal for developmental programming. Plants perceive light through various light-responsive proteins, termed photoreceptors. Phytochromes are red-light photoreceptors that are highly conserved across kingdoms. In the model plant Arabidopsis thaliana, phytochrome B serves as a light and thermal sensor, mediating physiological processes such as seedling germination and establishment, hypocotyl growth, chlorophyll biogenesis, and flowering. In response to red light, phytochromes convert to a biologically active form, translocating from the cytoplasm into the nucleus and further compartmentalizes into subnuclear compartments termed photobodies. PhyB photobodies regulate phytochrome-mediated signaling and physiological outputs. However, photobody function, composition, and biogenesis remain undefined since their discovery. Based on photobody cellular dynamics and the properties of internal components, photobodies have been suggested to undergo liquid-liquid phase separation, a process by which some membraneless compartments form. Here, we explore photobodies as environmental sensors, examine the role of their protein constituents, and outline the biophysical perspective that photobodies may be undergoing liquid-liquid phase separation. Understanding the molecular, cellular, and biophysical processes that shape how plants perceive light will help in engineering improved sunlight capture and fitness of important crops.

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UV-B Perception and Signal Transduction

Cited by 37 publications

References 0 publications

The B‐box zinc finger protein MdBBX20 integrates anthocyanin accumulation in response to ultraviolet radiation and low temperature

The B‐box zinc finger protein MdBBX20 integrates anthocyanin accumulation in response to ultraviolet radiation and low temperature

Interaction of COP1 and UVR8 regulates UV-B-induced photomorphogenesis and stress acclimation in Arabidopsis

Out of the Dark and Into the Light: A New View of Phytochrome Photobodies

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