PYL2 — Arabidopsis thaliana

Summary

AT2G26040 (PYL2) encodes a protein with abscisic acid binding, protein kinase activator, and protein phosphatase inhibitor activities, and belongs to the START-like domain superfamily. In Arabidopsis, PYL2 is associated with regulation of stomatal opening, transpiration, lateral root branching, and responses to water, drought, and salinity. It is linked to ABA-mediated signaling, MAPK cascade, TOR signaling, and processes including chlorophyll and starch breakdown, flavone metabolism, and abscission. The gene has been connected to traits such as drought sensitivity, water use efficiency, seed yield, germination rate, vegetative vigor, root branching, shoot growth angle, leaf size, stomatal resistance, and anthocyanin content. PYL2 localizes to the cytosol, nucleus, and plasma membrane, and is part of protein phosphatase inhibitor complexes. Studies of related genes in other species link the family to fruit growth and development, cold and heat tolerance, and resistance to necrotrophic fungi.