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Blue light receptor phot1 and phot2 regulate hypocotyl phototropism induced by high intensity blue light (HBL) in functional redundancy. The phenotype of  rpt2  single mutant is similar with double mutant  phot1phot2  that lost phototropism, but  rpt2phot1  double mutant shows normal phototropic response, which indicating that phot1 has dual opposite function with inducing and inhibiting hypocotyls phototropism. However, the mechanism of phot1-mediated inhibition remains to be elucidated. Here, we screened mutants with phototropism from EMS mutagenesis of  rpt2  and cloned the gene P1SA1 ( P hototropin 1  S ignaling  A ssociated  1 ), which maybe locate downstream of phot1 and function in regulating phot1-mediated inhibitory response. The  rpt2 p1sa1  mutant shows normal phototropism to unilateral HBL and overexpression of  PHOT1  in  rpt2 p1sa1  lost hypocotyl phototropism again, which indicated that P1SA1 may be the allelic of  PHOT1 . These results will open new perspectives about the screening and identification of genes involved in phot1-mediated inhibitory response, and provide theoretical basis for the self-regulation mechanism of plant to reduce high light damage.

Isolation and characterization of regulators involved in PHOT1-mediated inhibition of hypocotyl phototropism in Arabidopsis