NBR1 — Brassica oleracea var. botrytis

Summary

BoNBR1, located on chromosome 8 of cauliflower (Brassica oleracea var. botrytis), encodes a protein with domains characteristic of the NBR1 family, including UBA, FW, ZZ, and PB1 domains, and exhibits ubiquitin binding, chaperone protein binding, and Atg8-specific protease activity. The gene is associated with macroautophagy, xenophagy, protein lipidation, and targeting to the vacuole, as well as negative regulation of leaf senescence, responses to cadmium, thermal stimulus, salinity, abscisic acid, and defence against fungi. It is linked to traits including seed yield, pollen fertility, leaf yellowing tolerance, submergence tolerance, drought tolerance, oxidative stress response, and herbicide sensitivity. The protein localises to the phagophore, vacuolar lumen, cytoplasm, nucleus, and mitochondria. Studies of related genes in other species connect the family to heat resistance, seed yield, biomass, stomatal closure, and antiviral resistance.