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KMID : 0368420160590030223
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Journal of Plant Biology
2016 Volume.59 No. 3 p.223 ~ p.230
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UV-B signal transduction pathway in Arabidopsis
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Lee Jae-Hoon
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Abstract
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Plants experience a variety of environmental stresses such as cold, drought, freezing, flooding, wounding, heat and UV-B, all of which result in decreased productivity. Among abiotic stresses, UV-B stress is considered to be a critical factor affecting the rate of plant growth because the amount of UV-B reaching the Earth’s surface is constantly increasing. While high fluence rates of UV-B trigger stress-related processes, low fluence rates of UV-B induce photomorphogenesis, a crucial developmental process at the early seedling stage in plants. Among the signaling components involved in UV-B-mediated cellular response, a clade composed of UVR8-COP1-HY5 has been shown to be a central sequence that effectively transduces the pathway from the primary signal to adaptation response. This review summarizes the most recent progress in studies of UVR8-COP1-HY5 as the key players participating in the UV-B signal transduction pathway. The current understanding of additional UV-B signaling components including substrate receptors of multi-subunit E3 ubiquitin ligase is also discussed.
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KEYWORD
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Arabidopsis, COP1, HY5, UV-B, UVR8
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