P5CS1 — Brassica napus

Summary

BnP5CS1 (DARMORV10_A04P30250.1) on chromosome A04 of oilseed rape encodes a bifunctional enzyme with glutamate 5-kinase and glutamylphosphate reductase activities, classified as D1-pyrroline-5-carboxylate synthetase. This gene is associated with proline metabolism, including both biosynthesis and breakdown, and with responses to desiccation, hyperosmotic salinity, oxidative stress, and abscisic acid. It has been linked to traits such as proline content, leaf water potential, photosynthetic rate, and salt tolerance, as well as to drought, freezing, arsenic, and glyphosate tolerance. Associations also include flowering time, pollen development, root meristem size, and inflorescence architecture. The encoded protein localises to the cytoplasm, mitochondria, and Golgi complex. Studies of related genes in other species link the family to osmotic stress tolerance, drought resistance, heat tolerance, and root elongation under low water potential.