APX — Capsicum annuum

Summary

CaAPX (T459_16601) on pepper chromosome 6 encodes L-ascorbate peroxidase 1, a cytosolic haem peroxidase 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, carotenoid and auxin metabolism, and positive regulation of stomatal complex development. It has been linked to traits including pungency, fruit size, bacterial blight disease resistance, viral disease response, aphid response, relative chlorophyll content, net photosynthetic rate, leaf area index, root volume, seed viability, days to flowering, and proline and carotenoid content. Localisation evidence connects the product to the peroxisome membrane, chloroplast thylakoid membrane, mitochondria, stress granule, and plasmodesma. Studies of related genes in other species link the family to drought, heat, salt, ozone, and high-light stress tolerance, as well as hydrogen peroxide homeostasis, leaf senescence, and immune response.