Wargent, J.J., Gegas, V.C., Jenkins, G.I., Doonan, J.H. and Paul, N.D. (2009) UVR8 in Arabidopsis thaliana regulates multiple aspects of cellular differentiation during leaf development in response to ultraviolet B radiation. New Phytologist, 183(2), pp. 315-326. (doi: 10.1111/j.1469-8137.2009.02855.x) (PMID:19402876)
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Publisher's URL: http://dx.doi.org/10.1111/j.1469-8137.2009.02855.x
Abstract
Responses specific to ultraviolet B (UV-B) wavelengths are still poorly understood, both in terms of initial signalling and effects on morphogenesis. <i>Arabidopsis thaliana</i> UV RESISTANCE LOCUS8 (UVR8) is the only known UV-B specific signalling component, but the role of UVR8 in leaf morphogenesis is unknown. The regulatory effects of UVR8 on leaf morphogenesis at a range of supplementary UV-B doses were characterized, revealing both UVR8-dependent and independent responses to UV irradiation. Inhibition of epidermal cell division in response to UV-B is largely independent of UVR8. However, overall leaf growth under UV-B irradiation in wild-type plants is enhanced compared with a uvr8 mutant because of a UVR8-dependent compensatory increase of cell area in wild-type plants. UVR8 was also required for the regulation of endopolyploidy in response to UV-B, and the <i>uvr8</i> mutant also has a lower density of stomata than the wild type in the presence of UV-B, indicating that UVR8 has a regulatory role in other developmental events. Our findings show that, in addition to regulating UV-protective gene expression responses, UVR8 is involved in controlling aspects of leaf growth and morphogenesis. This work extends our understanding of how UV-B response is orchestrated at the whole-plant level.
| Item Type: | Articles |
|---|---|
| Keywords: | <i>Arabidopsis thaliana</i>, cell development, endopolyploidy, morphogenesis, UV-B, UVR8 |
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Jenkins, Professor Gareth |
| Authors: | Wargent, J.J., Gegas, V.C., Jenkins, G.I., Doonan, J.H., and Paul, N.D. |
| Subjects: | Q Science > QH Natural history > QH345 Biochemistry Q Science > QH Natural history > QH301 Biology |
| College/School: | College of Medical Veterinary and Life Sciences > School of Molecular Biosciences |
| Journal Name: | New Phytologist |
| ISSN: | 0028-646X |
| ISSN (Online): | 1469-8137 |
| Published Online: | 27 April 2009 |
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