title: Comparison of plant hormone signalling systems.
abstract: Plant growth and development are controlled by nine structurally distinct small molecules termed phytohormones. Over the last 20 years, the molecular basis of their signal transduction, from receptors to transcription factors, has been dissected using mainly Arabidopsis thaliana and rice as model systems. Phytohormones can be broadly classified into two distinct groups on the basis of whether the subcellular localization of their receptors is in the cytoplasm or nucleus, and hence soluble, or membrane-bound, and hence insoluble. Soluble receptors, which control the responses to auxin, jasmonates, gibberellins, strigolactones and salicylic acid, signal either directly or indirectly via the destruction of regulatory proteins. Responses to abscisic acid are primarily mediated by soluble receptors that indirectly regulate the phosphorylation of targeted proteins. Insoluble receptors, which control the responses to cytokinins, brassinosteroids and ethylene, transduce their signal through protein phosphorylation. This chapter provides a comparison of the different components of these signalling systems, and discusses the similarities and differences between them.
authors.affiliation: Laboratoire de Reproduction et Développement des Plantes, CNRS, INRA, ENS Lyon, UCBL, Université de Lyon, 69364 Lyon, France.
authors.forename: Antoine
authors.initials: A
authors.lastname: Larrieu
authors.affiliation: Laboratoire de Reproduction et Développement des Plantes, CNRS, INRA, ENS Lyon, UCBL, Université de Lyon, 69364 Lyon, France.
authors.forename: Teva
authors.initials: T
authors.lastname: Vernoux
mesh_terms: D017360:Arabidopsis / Q000378:metabolism; D012275:Oryza / Q000378:metabolism; D010937:Plant Growth Regulators / Q000378:metabolism*; D015398:Signal Transduction
chemical_list: D010937:Plant Growth Regulators
keywords: F-Box E3 ubiquitin ligases; SCF complex; abscisic acid; auxin; brassinosteroids; cytokinins; ethylene; gibberellins; jasmonic acid; phosphorylation cascade; phytohormones; salicylic acid; serine/threonine kinases; strigolactones; ubiquitination