TMT1 — Brassica napus

Summary

BnTMT1 (TMT1, VTE4) on chromosome C02 of oilseed rape (Brassica napus) encodes a SAM-dependent methyltransferase belonging to the gamma-tocopherol methyltransferase (γ-TMT) family. The gene is associated with tocopherol C-methyltransferase and N-methyltransferase activities. This gene is associated with vitamin E and glucosinolate biosynthesis, alkaloid metabolism, seed development and germination, and responses to salt stress. It localises to chloroplast inner membranes, thylakoids, vacuolar membranes, the tonoplast, cytosol, and nucleus. Associations include heterosis, alpha-tocopherol and 5-methyl-PC-8 accumulation, resistance to Botrytis cinerea, oxidative and salt stress tolerance, cold adaptation, sugar transport and compartmentation, glucose homeostasis, jasmonate accumulation, growth rate, and seed yield. Studies of related genes in other species link the family to tocochromanol biosynthesis, carotenoid content, and plant development, and to vitamin E and alpha-tocopherol accumulation.