Abstract
The Arabidopsis genome encodes for 20 members of putative ligand-gated channels, termed glutamate receptors (GLR). Despite the fact that initial studies suggested a role for GLRs in various aspects of photomorphogenesis, calcium homeostasis or aluminium toxicity, their functional properties and physiological role in plants remain elusive. Here, we have focussed on AtGLR3.4, which is ubiquitously expressed in Arabidopsis including roots, vascular bundles, mesophyll cells and guard cells. AtGLR3.4 encodes a glutamate-, touch-, and cold-sensitive member of this gene family. Abiotic stress stimuli such as touch, osmotic stress or cold stimulated AtGLR3.4 expression in an abscisic acid-independent, but calcium-dependent manner. In plants expressing the Ca2+ -reporter apoaequorin, glutamate as well as cold elicited cytosolic calcium elevations. Upon glutamate treatment of mesophyll cells, the plasma membrane depolarised by about 120 mV. Both glutamate responses were transient in nature, sensitive to glutamate receptor antagonists, and were subject to desensitisation. One hour after eliciting the first calcium signal, a 50% recovery from desensitisation was observed, reflecting the stimulus-induced fast activation of AtGLR3.4 transcription. We thus conclude that AtGLR3.4 in particular and GLRs in general could play an important role in the Ca2+ -based, fast transmission of environmental stress.
Similar content being viewed by others
Abbreviations
- GLR:
-
Glutamate receptor
- DNQX:
-
6,7-dinitroquinoxaline-2,3-dione
- CNQX:
-
6-cyano-7-nitro-quinoxaline-2,3-dione
- MNQX:
-
5,7-Dinitro-1,4-dihydro-2,3-quinoxalinedione
- GABA:
-
γ-aminobutyrate
- CHX:
-
Cycloheximide
References
Baum G, Long JC, Jenkins GI, Trewavas AJ (1999) Stimulation of the blue light phototropic receptor NPH1 causes a transient increase in cytosolic Ca2+. Proc Natl Acad Sci USA 96:13554–13559
Becker D, Geiger D, Dunkel M, Roller A, Bertl A, Latz A, Carpaneto A, Dietrich P, Roelfsema MRG, Voelker C, Schmidt D, Mueller-Roeber B, Czempinski K, Hedrich R (2004) AtTPK4, an Arabidopsis “open-rectifying” K+ channel, poised to control the pollen membrane voltage in a pH- and Ca2+ dependent manner. Proc Natl Acad Sci USA 101:15621–15626
Bouche N, Lacombe B, Fromm H (2003) GABA signaling: a conserved and ubiquitous mechanism. Trends Cell Biol 13:607–610
Braam J, Sistrunk ML, Polisensky DH, Xu W, Purugganan MM, Antosiewicz DM, Campbell P, Johnson KA (1997) Plant responses to environmental stress: regulation and functions of the Arabidopsis TCH genes. Planta 203(Suppl):S35–S41
Brenner ED, Martinez-Barboza N, Clark AP, Liang QS, Stevenson DW, Coruzzi GM (2000) Arabidopsis mutants resistant to S(+)-beta-methyl-alpha, beta-diaminopropionic acid, a cycad-derived glutamate receptor agonist. Plant Physiol 124:1615–1624
Chiu JC, Brenner ED, DeSalle R, Nitabach MN, Holmes TC, Coruzzi GM (2002) Phylogenetic and expression analysis of the glutamate-receptor-like gene family in Arabidopsis thaliana. Mol Biol Evol 19:1066–1082
Coruzzi GM, Zhou L (2001) Carbon and nitrogen sensing and signaling in plants: emerging ‘matrix effects’. Curr Opin Plant Biol 4:247–253
Davenport R (2002) Glutamate receptors in plants. Ann Bot (Lond) 90:549–557
Dennison KL, Spalding EP (2000) Glutamate-gated calcium fluxes in Arabidopsis. Plant Physiol 124:1511–1514
Dubos C, Huggins D, Grant GH, Knight MR, Campbell MM (2003) A role for glycine in the gating of plant NMDA-like receptors. Plant J 35:800–810
Elzenga JT, Van Volkenburgh E (1997) Kinetics of Ca(2+)- and ATP-dependent, voltage-controlled anion conductance in the plasma membrane of mesophyll cells of Pisum sativum. Planta 201:415–423
Iuchi S, Kobayashi M, Taji T, Naramoto M, Seki M, Kato T, Tabata S, Kakubari Y, Yamaguchi-Shinozaki K, Shinozaki K (2001) Regulation of drought tolerance by gene manipulation of 9-cis-epoxycarotenoid dioxygenase, a key enzyme in abscisic acid biosynthesis in Arabidopsis. Plant J 27:325–333
Kang J, Turano FJ (2003) The putative glutamate receptor 1.1 (AtGLR1.1) functions as a regulator of carbon and nitrogen metabolism in Arabidopsis thaliana. Proc Natl Acad Sci USA 100:6872–6877
Kim SA, Kwak JM, Jae SK, Wang MH, Nam HG (2001) Overexpression of the AtGluR2 gene encoding an Arabidopsis homolog of mammalian glutamate receptors impairs calcium utilization and sensitivity to ionic stress in transgenic plants. Plant Cell Physiol 42:74–84
Knight H, Knight MR (1995) Recombinant aequorin methods for intracellular calcium measurement in plants. Methods Cell Biol 49:201–216
Knight H, Trewavas AJ, Knight MR (1996) Cold calcium signaling in Arabidopsis involves two cellular pools and a change in calcium signature after acclimation. Plant Cell 8:489–503
Lacombe B, Becker D, Hedrich R, DeSalle R, Hollmann M, Kwak JM, Schroeder JI, Le Novere N, Nam HG, Spalding EP, Tester M, Turano FJ, Chiu J, Coruzzi G (2001) The identity of plant glutamate receptors. Science 292:1486–1487
Lam HM, Chiu J, Hsieh MH, Meisel L, Oliveira IC, Shin M, Coruzzi G (1998) Glutamate-receptor genes in plants. Nature 396:125–126
Madden DR (2002) The structure and function of glutamate receptor ion channels. Nat Rev Neurosci 3:91–101
Sivaguru M, Pike S, Gassmann W, Baskin TI (2003) Aluminum rapidly depolymerizes cortical microtubules and depolarizes the plasma membrane: evidence that these responses are mediated by a glutamate receptor. Plant Cell Physiol 44:667–675
Stitt M, Muller C, Matt P, Gibon Y, Carillo P, Morcuende R, Scheible WR, Krapp A (2002) Steps towards an integrated view of nitrogen metabolism. J Exp Bot 53:959–970
Tazawa M, Kikuyama M (2003) Is Ca2+ release from internal stores involved in membrane excitation in characean cells? Plant Cell Physiol 44:518–526
White PJ, Biskup B, Elzenga JTM, Homann U, Thiel G, Wissing F, Maathuis FJM (1999) Advanced patch-clamp techniques and single-channel analysis. J Exp Bot 50:1037–1054
White PJ, Bowen HC, Demidchik V, Nichols C, Davies JM (2002) Genes for calcium-permeable channels in the plasma membrane of plant root cells. Biochim Biophys Acta 1564:299–309
Acknowledgements
We thank K. Neuwinger and D. Giehl (University of Würzburg, Ger) for assistance during the Ca2+ measurements. We are grateful to A. Trewavas (University of Edinburgh, UK) for supplying us with seeds of apoaequorin-expressing Arabidopsis plants. This work was funded by DFG grants and Körber European Science Award to RH, and by a DFG grant (SPP1108) to PD and DB.
Author information
Authors and Affiliations
Corresponding author
Additional information
Data deposition: The sequences referred to in this paper have been deposited in the GenBank database (accession no. AF167355.1 [AtGLR3.4])
Rights and permissions
About this article
Cite this article
Meyerhoff, O., Müller, K., Roelfsema, M.R.G. et al. AtGLR3.4, a glutamate receptor channel-like gene is sensitive to touch and cold. Planta 222, 418–427 (2005). https://doi.org/10.1007/s00425-005-1551-3
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00425-005-1551-3