03 January 1997
Vol 275, Issue 5296

About The Cover

Many plants do not produce flowers at the tips of their shoots but continue to grow indefinitely. In the terminal flower 1 (tfl1) mutant of Arabidopsis, the tip is transformed into a cluster of flowers, as shown in this top view scanning electron micrograph (the cluster is ~500 micrometers across). The wild-type TFL1 gene is expressed just below the plant apex, where it normally promotes continued growth of the plant tip. See 80. [Image: D. Bradley, O. Ratcliffe, C. Vincent, R. Carpenter, and E. Coen]