Journal
PLANT SCIENCE
Volume 247, Issue -, Pages 71-82Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.plantsci.2016.03.007
Keywords
Symbiotic-nitrogen-fixation; GCR1; G proteins; Signalling; Nodule organogenesis
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Funding
- Italian Ministry of Education [Prot. 20105XLAXM]
- Progetto POR Campania [Prot. 2012.0219980]
- Progetto CISIA, Integration of Knowledge for sustainability and Innovation in the Agrofood Made in Italy [191/2009]
- Progetto POR CAMPUS, Qualita delle Produzioni Tipiche Campane ed il suo Territorio: Approcci Innovativi ed Integrati per rafforzare la Competitivita del Sistema Agroalimentare-QUARC [2012.0312514]
- Rete delle Biotecnologie in Campania, Progetto Bio Industrial Processes-BIP-CUP [B25C13000290007]
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G Protein Coupled Receptor (GPCRs) are integral membrane proteins involved in various signalling pathways by perceiving many extracellular signals and transducing them to heterotrimeric G proteins, which further transduce these signals to intracellular downstream effectors. GCR1 is the only reliable plant candidate as a member of the GPCRs superfamily. In the legume/rhizobia symbiotic interaction, G proteins are involved in signalling pathways controlling different steps of the nodulation program. In order to investigate the putative hierarchic role played by GCR1 in these symbiotic pathways we identified and characterized the Lotus japonicus gene encoding the seven transmembrane GCR1 protein. The detailed molecular and topological analyses of LjGCR1 expression patterns that are presented suggest a possible involvement in the early steps of nodule organogenesis. Furthermore, phenotypic analyses of independent transgenic RNAi lines, showing a significant LjGCR1 expression down regulation, suggest an epistatic action in the control of molecular markers of nodulation pathways, although no macroscopic symbiotic phenotypes could be revealed. (C) 2016 Elsevier Ireland Ltd. All rights reserved.
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