SO — Capsicum annuum

Summary

CaSO (T459_07155) on pepper chromosome 2 encodes a protein with molybdenum cofactor-binding, FAD-binding, heme-binding, cytochrome-b5 reductase, and nitrate reductase activities, and is associated with EC 1.8.3.1. The gene is associated with sulfite-to-sulfate conversion, cysteine degradation, nitrate assimilation, sulfur and chlorophyll metabolism, nitric oxide anabolism, cellular respiration, fruit ripening, and responses to sulfur dioxide, nitrite, and light. It localises to mitochondria, the cytosol, and organelle membranes. CaSO is also linked to virus resistance. Studies of related genes in other species connect the sulfite oxidase family to sulfite homeostasis, detoxification, and oxidation, as well as to leaf necrosis, fruit weight, plant height, and drought tolerance.