11 December 1992
Vol 258, Issue 5089

About The Cover

Expression of the maize anthocyanin-specific transcriptional activator R in tobacco (flowers) and Arabidopsis thaliana (stems and leaves) increases anthocyanin (red pigment) biosynthesis in both species and trichome (hair) production in Arabidopsis. Wild-type samples are on the left; those that express R are on the right. R functions in these heterologous species despite the evolutionary divergence of monocots and dicots and may prove to be a valuable visible marker in many plant species. See page 1773. [Photograph: Ted Preuss]