CAT1 — Oryza sativa Japonica

Summary

OS03G0131200 (CAT1/CATC) on rice chromosome 3 encodes a catalase (EC 1.11.1.6) with multiple annotated molecular functions including S-nitrosylase, nucleoside diphosphate kinase, histone acetyltransferase, and heme-binding activities. The protein localises to the peroxisomal lumen and is associated with cellular nitric oxide homeostasis, hydrogen peroxide response, ascorbate-glutathione cycle, cell redox homeostasis, and regulation of ethylene signalling. CAT1 is associated with numerous agronomic traits including grain yield, seed yield, biomass, net photosynthetic rate, heat tolerance, low temperature stress response, cadmium concentration, nitrate uptake, pollen fertility, stomatal closure, leaf chlorosis, and chloroplast development. It is also linked to programmed cell death, immunity, drought tolerance, water use efficiency, and reactive oxygen species tolerance. Studies of related genes in other species link the catalase family to peroxisomal function, disease resistance, and stress responses.