Protein function
Encodes a light-labile photoreceptor.
Phenotype
Overexpressor: PHYA overexpressor is early flowering under both SD and LD conditions.
[Bagnall et al., 1995] Single mutant: phya single mutant is slightly late flowering under both SD and LD conditions. (The flowering-time phenotype is dependent on the R/FR ratio).
[Johnson et al., 1994][Monte et al., 2003][Halliday et al., 2003] Function:Regulatory photoreceptor which exists in two forms that are reversibly interconvertible by light: the Pr form that absorbs maximally in the red region of the spectrum and the Pfr form that absorbs maximally in the far-red region. Photoconversion of Pr to Pfr induces an array of morphogenetic responses, whereas reconversion of Pfr to Pr cancels the induction of those responses. Pfr controls the expression of a number of nuclear genes including those encoding the small subunit of ribulose-bisphosphate carboxylase, chlorophyll A/B binding protein, protochlorophyllide reductase, rRNA, etc. It also controls the expression of its own gene(s) in a negative feedback fashion. Involved in the flowering time regulation.
[Data from UniProt]
Regulators, targets and interactors
Downstream actors
causality CO --
[Valverde et al., 2004] --
[View TAIR record] Upstream actors
Protein-protein interactions
PIF3 --
[Clack et al., 2009] --
[View TAIR record]PHYA --
[Clack et al., 2009] --
[View TAIR record] PHYA --
[Clack et al., 2009] --
[View TAIR record]