MAR1 — Daucus carota subsp. sativus

Summary

DCAR_005948 (DcMAR1) on carrot chromosome 2 encodes a protein with POTRA domains characteristic of the Toc75 family, a component of the chloroplast outer membrane translocon. The product possesses chloroplast targeting sequence receptor activity, protein translocase activity, and transmembrane signaling receptor activity, and localises to the Toc complex and chloroplast envelope. DcMAR1 is associated with chloroplast and etioplast organisation, chloroplast protein import, and the transition from vegetative to reproductive phase. The gene has been connected to root thickness, chlorophyll content, flowering time, disease tolerance, and linolenic acid content. Associations also include plastid development, embryogenesis, deetiolation, root growth, gravitropism, iron homeostasis, cold stress response, and fatty acid composition. Studies of related genes in other species link the family to etioplast development and chloroplast protein import.