PT — Lactuca sativa

Summary

LsPT (PT, AMP1, COP2) on chromosome 2 of garden lettuce encodes a metallocarboxypeptidase with carboxypeptidase activity, containing peptidase M28 and TFR-like dimer domains, and binds metals and proteins. It is associated with vitamin E anabolism, photomorphogenesis, meristem maintenance, regulation of seed maturation, flower development, leaf vascular tissue pattern formation, root development, embryo development ending in seed dormancy, and negative regulation of gene silencing by miRNA. The gene is linked to chlorophyll content, shoot regeneration, root architecture, biomass accumulation, dehydration resistance, leaf number, bolting time, flowering time, senescence, stomatal development, seed production, seed dormancy, cytokinin levels, and shoot meristem size. It localises to the endoplasmic reticulum and plasma membrane. Studies of related genes in other species connect the family to miRNA translational repression, shoot apical meristem size, cytokinin levels, and stress tolerance.