The ABA receptors -- we report you decide.
The plant hormone abscisic acid (ABA) has been implicated in a variety of physiological responses ranging from seed dormancy to stomatal conductance. Recently, three groups have reported the molecular identification of three disparate ABA receptors. Unlike the identification of other hormone receptors, in these three cases high affinity binding to ABA rather than the isolation of ABA insensitive mutants led to these receptor genes. Interestingly, two of the receptors encode genes involved in floral timing and chlorophyll biosynthesis, which are not considered traditional ABA responses. And the third receptor has been clouded in issues of its molecular identity. To clearly determine the roles of these genes in ABA perception it will require placing of these ABA-binding proteins into the rich ABA physiological context that has built up over the years.
McCourt
Peter
P
Department of Cell & Systems Biology, University of Toronto, 25 Willcocks Street, Toronto M5S 3B2, Canada. mccourt@csb.utoronto.ca
Creelman
Robert
R
D000040:Abscisic Acid / Q000378:metabolism / Q000502:physiology*; D001665:Binding Sites; D010937:Plant Growth Regulators / Q000378:metabolism / Q000502:physiology*; D010940:Plant Proteins / Q000235:genetics / Q000502:physiology*; D010944:Plants / Q000378:metabolism; D015398:Signal Transduction / Q000502:physiology
D010937:Plant Growth Regulators; D010940:Plant Proteins; D000040:Abscisic Acid