ETR — Arabidopsis thaliana

Summary

AT1G66340 (ETR) in Arabidopsis thaliana encodes a histidine kinase with ethylene receptor activity, copper binding, and dual-specificity protein kinase functions, featuring GAF and receiver domains characteristic of the ETR family. The gene is associated with ethylene sensing and signaling pathways, including ethylene biosynthesis and hormone signaling networks. Observed phenotypes link ETR to ethylene insensitivity, seed germination, salt stress response, and susceptibility to necrotrophic pathogens. The gene has been connected to diverse biological processes such as lateral root branching, flavonol metabolism, cellular defense response, and regulation of vitamin E anabolism. Associations with agronomically relevant traits include leaf carbon content, tiller number, fruit ripening, submergence tolerance, photosynthetic ability, and responses to nematodes, aphids, and bacterial disease. Studies of related genes in other species connect the family to tuber dormancy, fruit firmness, and disease resistance.