Signal transduction mediated by the plant UV‐B photoreceptor UVR8
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Abstract
Contents Summary 1247 I. Introduction 1247 II. The UVR8-COP1 pathway 1248 III. The UVR8-WRKY36 pathway 1248 IV. The UVR8-BES1/BIM1 pathway 1249 V. Other pathways 1250 VI. Conclusion and perspectives 1250 Acknowledgements 1251 References 1251 SUMMARY: Ultraviolet-B (UV-B) light is an intrinsic part of sunlight that has significant effects on plant development and acclimation responses. UVR8 (UV Resistance Locus 8) is the long sought-after UV-B photoreceptor that mediates UV-B light perception and signal transduction. UV-B irradiation induces the monomerization and nuclear accumulation of UVR8 in plant cells to activate the UV-B signaling pathway. The photoactivated UVR8 could transduce UV-B signal via multiple mechanisms to regulate transcription and plant growth. Here, we summarize current understanding of UVR8-mediated UV-B signal transduction pathways, including UVR8-COP1 (CONSTITUTIVELY PHOTOMORPHOGENIC 1) and UVR8-WRKY36 (WRKY DNA-BINDING PROTEIN 36), UVR8-BES1 (BRI1-EMS-SUPPRESSOR1) and BIM1 (BES1-INTERACTING MYC-LIKE 1).
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