APX — Lactuca sativa

Summary

LsAPX, encoded by gene LSAT_V11C900463580 on chromosome 9 of garden lettuce (Lactuca sativa), is a haem peroxidase with L-ascorbate peroxidase activity, also annotated with p-coumarate 3-hydroxylase, siRNA binding, and protein kinase activities. The gene is associated with cellular response to oxidative stress, photoprotection, auxin metabolism, cell cycle transitions, and leaf patterning. It localises to the peroxisome membrane, chloroplast thylakoid membrane, and stress granules. Associations include leaf chlorophyll content, bacterial blight disease resistance, aphid response, flavonoid content, seed viability, days to flowering, photosynthetic rate, transpiration rate, and ethylene sensitivity. The gene is also linked to traits such as peroxidase-71 content, IAA content, proline content, and quantum yield, as well as phenotypes including excess light stress tolerance, heat stress memory, water-use efficiency, drought tolerance, and pathogen defense.