Plant hormone receptors
Armitage, Lynne Department of Biology, University of York, York, United Kingdom.
Leyser, Ottoline Department of Biology, University of York, York, United Kingdom.
- Receptor-mediated signal transduction
- Identification of TIR1 as a receptor for auxin
- Role of TIR1 in auxin signaling
- Auxin signaling F-box proteins (AFBs)
- Identification of GID1 as a gibberellin receptor
- Role of GID1 in gibberellin signaling
- Soluble hormone receptors
- Related Primary Literature
- Additional Reading
Proteins to which hormones bind, triggering responses in the target cells that express the receptors. There are basically five plant hormone classes: abscisic acid, auxin, cytokinin, gibberellin, and ethylene. All of these are simple organic molecules that have been chemically defined for many decades. More recently, additional hormones such as brassinosteroids and jasmonic acid have been identified, and there are likely to be many more given the complexity of plant secondary metabolism (metabolism of secondary plant products that are not necessary for survival, but that may be useful to the plant, such as pigments, scents, and flavors). Despite years of effort and detailed knowledge of the chemical structure and physiological and developmental effects of plant hormones, dissecting hormone signal transduction pathways has lagged, and plant hormone receptors have been particularly elusive. Recent advances in this area have identified typical transmembrane receptor kinases for ethylene, cytokinin, and brassinosteroids, similar to those known for many well-characterized signaling pathways. However, unusual soluble nuclear receptors for auxin and gibberellin have also been discovered. Because of their unconventional properties, it is perhaps not surprising that these receptors have been difficult to identify. See also: Abscisic acid; Auxin; Brassinosteroids; Cytokinins; Ethylene (plant physiology); Gibberellins; Plant hormones; Protein
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