29 November 1996
Vol 274, Issue 5292

About The Cover

Scanning electron micrograph depicting developing female spikelets in maize homozygous for the zag1-mum1 mutant allele (magnification 115). The mutation results in a loss of floral meristem determinacy that is manifested by the production of extra silks from each floret. The mutant phenotype was uncovered through a recently developed reverse genetics approach in maize. See 1537. [Image: B. A. Ambrose and M. Mena, University of California, San Diego]