SMAX1 — Arabidopsis thaliana

Summary

AT5G57710, SMAX1 (SUPPRESSOR OF MAX2 1) in Arabidopsis thaliana, encodes a protein with ATP hydrolase activity and DNA-binding transcription factor activity, belonging to the Clp_N_dom_sf and P-loop_NTPase families. It is localized to both the cytoplasm and nucleus. SMAX1 is associated with responses to karrikin and strigolactone, thermomorphogenesis, shade avoidance, and regulation of seed maturation. It has been linked to abscisic acid and chlorophyll breakdown, gibberellin biosynthesis, auxin transport, and salicylic acid-mediated signaling. Phenotypically, SMAX1 is connected to root hair length and elongation, hypocotyl growth and thermomorphogenesis, shoot branching, seed dormancy and germination, leaf morphology, anthocyanin accumulation, and disease resistance. It is also associated with drought and salt stress tolerance, osmotic stress resistance, and cuticle formation. Studies of related genes in other species link the SMAX1 family to karrikin response and parthenocarpy.