UV-B induced morphogenesis: four players or a quartet?
Low levels of ultraviolet (UV)-radiation alter the morphology of plants. UV-B exposure can lead to shorter petioles and shorter, narrower and/or thicker leaf blades. The resulting decrease in leaf area has been associated with inhibitory UV-B effects on biomass accumulation. In Arabidopsis, UV-B effects on leaf area have variously been attributed to altered cell division, cell expansion or combinations of these two processes. A dedicated UV-B sensory system, crosstalk between flavonoids and auxins, endoreduplication and generic Stress Induced Morphogenic Responses (SIMR) have all been proposed to contribute to the UV-B phenotype. Here, we propose that UV-mediated morphogenesis, rather than being controlled by a single regulatory pathway, is controlled by a regulatory blur involving multiple compensatory molecular and physiological feedback interactions.
School of Biological, Earth and Environmental Sciences, University College Cork, Distillery Field, Cork, Ireland. m.jansen@ucc.ie
Marcel A K
MA
Jansen
Aoife M
AM
Coffey
Els
E
Prinsen
D017360:Arabidopsis / Q000033:anatomy & histology / Q000254:growth & development / Q000528:radiation effects*; D018533:Biomass; D002455:Cell Division; D062951:Endoreduplication; D025461:Feedback, Physiological; D005419:Flavonoids / Q000378:metabolism; D007210:Indoleacetic Acids / Q000378:metabolism; D009024:Morphogenesis / Q000528:radiation effects*; D010641:Phenotype; D063245:Plant Development / Q000528:radiation effects*; D018515:Plant Leaves / Q000033:anatomy & histology / Q000254:growth & development / Q000528:radiation effects*; D015398:Signal Transduction; D013312:Stress, Physiological; D014466:Ultraviolet Rays
D005419:Flavonoids; D007210:Indoleacetic Acids