Boron-regulated hypocotyl elongation is affected in Arabidopsis mutants with defects in light signalling pathways |
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| Authors: | Tomáš Kocábek Zdeněk Svoboda Ali M Al-Zwi Stephen A Rolfe Martin Fellner |
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| Institution: | 1. Biology Centre of the Academy of Sciences of the Czech Republic v.v.i., Institute of Plant Molecular Biology, Brani?ovská 31/1160, 370 05 ?eské Budějovice, Czech Republic;2. Palacky University in Olomouc, Faculty of Science, Department of Cell Biology and Genetics, ?lechtitel? 11, 783 71 Olomouc, Czech Republic;3. University of Sheffield, Department of Animal and Plant Sciences, Sheffield S10 2TN, United Kingdom;4. Institute of Experimental Botany, Academy of Science of the Czech Republic, v.v.i. ?lechtitel? 11, 783 71 Olomouc, Czech Republic;1. Molecular Signaling Lab, Computational Systems Biology Research Group, Department of Signal Processing, Tampere University of Technology, P.O. Box 553, 33101 Tampere, Finland;2. Institute for Systems Biology, 1441N 34th Street, Seattle, WA 98103-8904, USA;1. Centre of the Region Haná for Biotechnological and Agricultural Research, Department of Biophysics, Faculty of Science, Palacký University in Olomouc, ?lechtitel? 11, Olomouc CZ-78371, Czech Republic;2. Laboratory of Growth Regulators, Palacký University in Olomouc & Institute of Experimental Botany ASCR, ?lechtitel? 11, Olomouc CZ-78371, Czech Republic;1. Graduate School of Science, Kobe University, 1-1 Rokkodai-cho Nada, Kobe 657-8501, Japan;2. Institute for Protein Research, Osaka University, 3-2 Yamadaoka, Suita, Osaka 565-0871, Japan;3. Center for Supports to Research and Education Activities, Kobe University, 1-1 Rokkodai-cho Nada, Kobe 657-8501, Japan;1. Departamento de Biología, Universidad Autónoma de Madrid, c/Darwin 2, Campus de Cantoblanco, 28049, Madrid, Spain;2. IPK-Leibniz Institute of Plant Genetics and Crop Plant Research, Department of Physiology and Cell Biology, 06466, Gatersleben, Germany |
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| Abstract: | We studied the effect of elevated boron (B) concentrations on the growth and development of Arabidopsis thaliana in vitro with respect to different light conditions. Two basic responses were observed. At high concentrations (above 5 mM) a clear toxicity effect of B on plant growth was apparent. Seedlings were short, stunted and pale. However at concentrations between 1 and 3 mM H3BO3, hypocotyl elongation was stimulated in all Arabidopsis ecotypes tested relative to plants grown at 0.1 mM H3BO3. The stimulation of hypocotyl elongation by elevated B was proportionally greater with increasing irradiance. We also showed that blue light (BL) and red light (RL) did not alter the sensitivity of Arabidopsis hypocotyls to boron, but, dependent on genotype, BL and RL increased or reduced capacity of boron-induced hypocotyl elongation. Analysis of photomorphogenic mutants indicated the existence of an interaction between boron and light signalling pathways during plant growth and development. This interaction was supported by the observation that the expression of the BOR1 gene in Arabidopsis hypocotyls was stimulated by BL and RL. Our results suggest that in etiolated or light-grown seedlings the stimulation of hypocotyl growth by boron can be mediated by cryptochromes and phytochromes. |
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