The present invention relates to transformed plants, in particular transformed plants producing larger amounts of plastoquinones, tocotrienols and tocopherols than non-transformed identical plants. This invention also relates to a method for producing these plants, and to a method for cultivating these plants. The plants according to the invention also have the property of being tolerant to herbicides that are inhibitors of the .rho.-hydroxyphenylpyruvate dioxygenase enzyme.