Re‐interpreting plant morphological responses to UV‐B radiation
- 24 June 2014
- journal article
- review article
- Published by Wiley in Plant, Cell & Environment
- Vol. 38 (5), 856-866
- https://doi.org/10.1111/pce.12374
Abstract
There is a need to reappraise the effects of UV-B radiation on plant morphology in light of improved mechanistic understanding of UV-B effects, particularly elucidation of the UV RESISTANCE LOCUS 8 (UVR8) photoreceptor. We review responses at cell and organismal levels, and explore their underlying regulatory mechanisms, function in UV protection and consequences for plant fitness. UV-induced morphological changes include thicker leaves, shorter petioles, shorter stems, increased axillary branching and altered root:shoot ratios. At the cellular level, UV-B morphogenesis comprises changes in cell division, elongation and/or differentiation. However, notwithstanding substantial new knowledge of molecular, cellular and organismal UV-B responses, there remains a clear gap in our understanding of the interactions between these organizational levels, and how they control plant architecture. Furthermore, despite a broad consensus that UV-B induces relatively compact architecture, we note substantial diversity in reported phenotypes. This may relate to UV-induced morphological changes being underpinned by different mechanisms at high and low UV-B doses. It remains unproven whether UV-induced morphological changes have a protective function involving shading and decreased leaf penetration of UV-B, counterbalancing trade-offs such as decreased photosynthetic light capture and plant-competitive abilities. Future research will need to disentangle seemingly contradictory interactions occurring at the threshold UV dose where regulation and stress-induced morphogenesis overlap.Keywords
Funding Information
- European Cooperation in Science and Technology (FA0906)
- Academy of Finland (266523)
- Ministerstvo kolstv�, ml�dee a tlov�chovy, R (LD12030)
This publication has 103 references indexed in Scilit:
- Multiple Roles for UV RESISTANCE LOCUS8 in Regulating Gene Expression and Metabolite Accumulation in Arabidopsis under Solar Ultraviolet RadiationPlant Physiology, 2012
- Atypical E2F activity coordinates PHR1 photolyase gene transcription with endoreduplication onsetThe EMBO Journal, 2010
- Arabidopsis ROOT UVB SENSITIVE2/WEAK AUXIN RESPONSE1Is Required for Polar Auxin TransportTHE PLANT CELL ONLINE, 2010
- Interaction of COP1 and UVR8 regulates UV-B-induced photomorphogenesis and stress acclimation in ArabidopsisThe EMBO Journal, 2009
- The Modified Flavonol Glycosylation Profile in the Arabidopsis rol1 Mutants Results in Alterations in Plant Growth and Cell Shape FormationTHE PLANT CELL ONLINE, 2008
- Differences in pigment composition, photosynthetic rates and chlorophyll fluorescence images of sun and shade leaves of four tree speciesPlant Physiology and Biochemistry, 2007
- Flavonoid Accumulation in Arabidopsis Repressed in Lignin Synthesis Affects Auxin Transport and Plant GrowthTHE PLANT CELL ONLINE, 2007
- ArabidopsisWEE1 Kinase Controls Cell Cycle Arrest in Response to Activation of the DNA Integrity CheckpointPlant Cell, 2007
- Relationships between leaf pigment content and spectral reflectance across a wide range of species, leaf structures and developmental stagesRemote Sensing of Environment, 2002
- Light signals perceived by crop and weed plantsField Crops Research, 2000