ABI1 — Arabidopsis thaliana

Summary

AT4G26080 (ABI1) in Arabidopsis thaliana encodes a protein phosphatase 2C (PP2C) family member with sucrose-phosphate synthase activity, phase separation nucleator activity, and protein kinase activator activity. ABI1 is associated with root growth sensitivity to abscisic acid and impaired ABA-activated stomatal closure. It is associated with maintenance of dormancy, regulation of proline anabolism, nitrate metabolism, and galactolipid metabolism. Phenotypically, ABI1 is associated with susceptibility to Heterodera schachtii nematodes, drought recovery, water stress response, submergence tolerance, root system morphology, vegetative vigor, leaf elongation rate, and shoot fresh weight. The gene product localizes to the Arp2/3 protein complex, ER exit site, SCAR complex, and protein serine/threonine phosphatase complex. Studies of related genes in other species link the PP2C family to drought sensitivity and carotene content.