ABA binding to PYR/PYL/RCAR receptor induces the for mation of a protein complex with PP2 Cand the
inhibition of phosphatase activity
In the absence of ABA,PP2C dephosphorylate SnRK2.
When ABA is present,PP2C binding to the receptor releases inhibition of SnRK2 activity,which can phosphory late down stream targets,including ABI5-relatedtran scription factors