APX — Nicotiana attenuata

Summary

A4A49_10239 (APX2) on coyote tobacco chromosome scaffold01197 encodes a haem peroxidase of the Ccp1-like family with L-ascorbate peroxidase activity (EC 1.11.1.7). It is associated with the ascorbate-glutathione cycle, cellular response to oxidative stress, nitrogen fixation, cell wall thickening, and positive regulation of stomatal complex development. The gene is linked to hydrogen peroxide content, IAA content, shoot dry weight, net photosynthetic rate, water use efficiency, bacterial blight disease resistance, and viral disease response. Associations also include floral organ size, seed viability, days to flowering, and vegetative-to-reproductive phase transition. The encoded protein localises to the peroxisome membrane, chloroplast thylakoid membrane, and stress granules. Related genes in other species link the family to heat, salt, drought, and oxidative stress tolerance, as well as root development and pathogen defence.