CAT3 — Brassica napus

Summary

BnCAT3 (DARMORV10_C08P20260.1) on chromosome C08 encodes a catalase family protein with haem binding and multiple annotated molecular functions including S-nitrosylase, histone acetyltransferase, and protein kinase activities. The gene is associated with superoxide metabolism, the ascorbate-glutathione cycle, cellular respiration, and heat dissipation, and localises to the peroxisomal lumen, chloroplast envelope, and tonoplast. In oilseed rape, BnCAT3 has been linked to leaf senescence, stomatal closure, hydrogen peroxide accumulation, oxidative stress tolerance, and circadian clock-regulated gene expression. It is also associated with agronomically important traits including biomass yield, net photosynthetic rate, stem and root weights, leaf relative water content, and carotenoid, flavonoid, and proline content. Studies of related genes in other species connect the family to stress response, pollen hydration, and UV-C-induced programmed cell death.