PYL4 — Arabidopsis thaliana

Summary

AT2G38310 (PYL4, also known as RCAR10) encodes a protein with abscisic acid (ABA) binding, protein phosphatase inhibitor activity, and protein kinase activator activity, placing it as a core ABA receptor in Arabidopsis thaliana. The gene is associated with the regulation of seed dormancy, seed germination, and mRNA destabilization, as well as flavone metabolism, nitrate assimilation, and starch breakdown. Phenotypically, PYL4 has been linked to biomass and transpiration. The gene is associated with drought recovery, water use efficiency, leaf water potential, and vegetative vigor, along with responses to salinity, osmotic stress, and nitrate sensitivity. It also shows associations with root branching, shoot growth angle, seed yield, and sensitivity to hormones including auxin, gibberellic acid, and ethylene. Studies of related genes in other species link the PYL4 family to ABA and jasmonate responses, as well as susceptibility to Pseudomonas syringae.