title: Novel connections in plant organellar signalling link different stress responses and signalling pathways.
abstract: To coordinate growth, development and responses to environmental stimuli, plant cells need to communicate the metabolic state between different sub-compartments of the cell. This requires signalling pathways, including protein kinases, secondary messengers such as Ca(2+) ions or reactive oxygen species (ROS) as well as metabolites and plant hormones. The signalling networks involved have been intensively studied over recent decades and have been elaborated more or less in detail. However, it has become evident that these signalling networks are also tightly interconnected and often merge at common targets such as a distinct group of transcription factors, most prominently ABI4, which are amenable to regulation by phosphorylation, potentially also in a Ca(2+)- or ROS-dependent fashion. Moreover, the signalling pathways connect several organelles or subcellular compartments, not only in functional but also in physical terms, linking for example chloroplasts to the nucleus or peroxisomes to chloroplasts thereby enabling physical routes for signalling by metabolite exchange or even protein translocation. Here we briefly discuss these novel findings and try to connect them in order to point out the remaining questions and emerging developments in plant organellar signalling.
authors.affiliation: Department of Ecogenomics and Systems Biology, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria.
authors.forename: Przemyslaw
authors.initials: P
authors.lastname: Kmiecik
authors.affiliation: Department of Ecogenomics and Systems Biology, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria.
authors.forename: Manuela
authors.initials: M
authors.lastname: Leonardelli
authors.affiliation: Department of Ecogenomics and Systems Biology, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria markus.teige@univie.ac.at.
authors.forename: Markus
authors.identifier: 0000-0001-7204-1379
authors.initials: M
authors.lastname: Teige
mesh_terms: D002467:Cell Nucleus / Q000378:metabolism; D015388:Organelles / Q000502:physiology*; D059828:Plant Cells / Q000378:metabolism; D018521:Plant Physiological Phenomena; D015398:Signal Transduction; D013312:Stress, Physiological
keywords: Acclimation to stress; calcium signal; chloroplast; mitochondria; phosphorylation; photosynthesis; reactive oxygen species; retrograde signalling; signalling; transcription factor.