UVR8 in Arabidopsis thaliana regulates multiple aspects of cellular differentiation during leaf development in response to ultraviolet B radiation

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)

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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 > Institute of Molecular Cell and Systems Biology
Journal Name:New Phytologist
ISSN:0028-646X
ISSN (Online):1469-8137
Published Online:27 April 2009

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
419341Characterisation of a UVB specific signalling pathwayGareth JenkinsBiotechnology and Biological Sciences Research Council (BBSRC)BB/D019281/1Institute of Molecular Cell and Systems Biology