The Venus gene (V), IRES sequences (I) and the p19HA fusion gene (p19) used in this report were derived from the Venus-pTA7002GW (Fujioka et al. 2007), yy376 (Yamamoto et al. 2003) and pBICp19HA (Kurihara et al. 2007; Takeda et al. 2002) plasmids, respectively. The HAtagged abscisic acid receptor (HA-PYR1, P) sequence was amplified by polymerase chain reaction (PCR) from an Arabidopsis cDNA library using the following primers: 5′ATC TAG ATG TAT CCA TAT GAT GTA CCA GAT TAT GCT ATG CCT TCG GAG TTA ACA CCA G-3′ and 5′-AAA AAA CTA GTT CAC GTC ACC TGA GAA CCA CTT CC
3′. The constructs depicted in Figure 1 were constructed by PCR amplification, restriction endonuclease digestion and ligation of selected fragments into a pSK1 vector (Kojima et al. 1999). To construct double-stranded Venus (dsVenus), a partial Venus fragment (256 nt) was amplified using the 5′-CAC CGC TGG ACG GCG ACG TAA ACG-3′ and 5′ACT AGT GTC CTT GAA GAA GAT GGT GC-3′ primers, subcloned into the pENTR/D-TOPO vector and then transferred into the pBI-sense, antisense Gateway vector (Nemoto et al. 2009) using LR clonase II (Invitrogen, Life Technologies, Tokyo, Japan).