APX — Nicotiana attenuata

Summary

A4A49_05124 (APX2) on chromosome 7 of coyote tobacco encodes a 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, and reactive oxygen species homeostasis. It is linked to traits including hydrogen peroxide content, net photosynthetic rate, water use efficiency, bacterial blight disease resistance, aphid response, seed viability, days to flowering, and shoot dry weight. The encoded product localises to the peroxisome membrane, chloroplast thylakoid membrane, and mitochondria. APX2 is also associated with excess light stress tolerance, thermotolerance, drought tolerance, and photo-oxidative stress response. Studies of related genes in other species link the family to salt stress tolerance, heat stress tolerance, and oxidative stress tolerance.