APX — Lactuca sativa

Summary

LsAPX, encoded by gene LSAT_V11C800419590 on lettuce chromosome 8, is a haem peroxidase with L-ascorbate peroxidase activity, also annotated for p-coumarate 3-hydroxylase, siRNA binding, and protein kinase activities. It localises to the peroxisome membrane, chloroplast thylakoid membrane, and stress granules. The gene is associated with cellular responses to oxidative stress, chitin, and bacterial molecules, photoprotection, auxin metabolism, stomatal development, leaf patterning, and the cell cycle. It is linked to leaf chlorophyll content, bacterial blight disease resistance, aphid response, flavonoid content, photosynthetic rate, transpiration rate, days to flowering, leaf senescence, seed viability, and heat stress memory. Studies of related genes in other species connect the family to salt, heat, and high-light stress tolerance, root development, and resistance to fungal and viral pathogens.