Contents

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]