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Signaling Mechanisms Regulating Diverse Plant Cell Responses to UVB Radiation

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Abstract

UVB radiation (290-320 nm) causes diverse effects in plant cells that vary with the fluence rate of exposure. High fluence rates of UVB radiation cause damage to DNA and formation of reactive oxygen species in mitochondria and chloroplasts, which lead to oxidation of membrane proteins and lipids and inhibition of cellular functions. In response to oxidative stress, mitochondrial transmembrane potential dissipates, resulting in cytochrome c release and activation of metacaspases. This leads to the apoptosis-like cell death. The signaling mechanism based on UVB DNA damage includes check-point activation, cell-cycle arrest, and finally programmed cell death with characteristic DNA fragmentation and morphological hallmarks typical of apoptotic cells. Recently, it was shown that among the components of this signaling mechanism the transcriptional factor SOG1 (suppressor of gamma response 1) plays a key role in regulation of programmed cell death in plants. In contrast to its damaging effects, UVB radiation at low fluence rates can act as a regulatory signal that is specifically perceived by plants to promote acclimation and survival in sunlight. The protective action of UVB is based on expression of various genes, including those encoding flavonoid synthesis enzymes that provide a UVB-absorbing sunscreen in epidermal tissues and DNA photorepair enzymes. These processes are mediated by the UVB photoreceptor UVR8, which has been recently characterized at the molecular level. Now progress is made in uncovering the UVR8-mediated signaling path-way mechanism in the context of UVB photon perception and revealing the biochemical components of the early stages of light signal transduction. In this review, attention is focused on the achievements in studying these UVB-induced signaling processes.

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Abbreviations

COP1:

E3 ubiquitin ligase

CPD:

cyclobutane pyrimidine dimers

HY5:

transcription factor

PCD:

programmed cell death

ROS:

reactive oxygen species

RUP1/RUP2:

repressors of photomorphogenesis 1 and 2

SOG1:

suppressor of gamma response 1 (transcription factor)

SPA1:

suppressor of phyA-1

UVB/UVA:

ultraviolet B/ultraviolet A

UVR8:

UV resistance locus 8 (UVB receptor protein)

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  1. Lomonosov Moscow State University, 119991, Moscow, Russia

    G. Ya. Fraikin

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Original Russian Text © G. Ya. Fraikin, 2018, published in Biokhimiya, 2018, Vol. 83, No. 7, pp. 972–980.

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Fraikin, G.Y. Signaling Mechanisms Regulating Diverse Plant Cell Responses to UVB Radiation. Biochemistry Moscow 83, 787–794 (2018). https://doi.org/10.1134/S0006297918070027

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