APX — Capsicum annuum

Summary

CaAPX (T459_16600) on pepper chromosome 6 encodes a haem peroxidase of the Ccp1-like family with L-ascorbate peroxidase activity (EC 1.11.1.7). The gene is associated with the ascorbate-glutathione cycle, cellular response to oxidative stress, photoprotection, and carotenoid and auxin metabolism. It has been linked to traits including pungency, fruit size, bacterial blight disease resistance, viral disease response, net photosynthetic rate, relative chlorophyll content, leaf area index, root volume, seed viability, days to flowering, and proline and carotenoid content. The encoded protein localises to the peroxisome membrane, chloroplast thylakoid membrane, mitochondria, and stress granules. Studies of related genes in other species connect the family to drought and heat stress tolerance, oxidative stress resistance, stomatal development, and photo-oxidative stress response.