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Science 29 November 1996:
Vol. 274. no. 5292, pp. 1537 - 1540
DOI: 10.1126/science.274.5292.1537
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Reports

Diversification of C-Function Activity in Maize Flower Development

Montaña Mena, * Barbara A. Ambrose, Robert B. Meeley, Steven P. Briggs, Martin F. Yanofsky, Robert J. Schmidt dagger

The Arabidopsis gene AGAMOUS is required for male and female reproductive organ development and for floral determinacy. Reverse genetics allowed the isolation of a transposon-induced mutation in ZAG1, the maize homolog of AGAMOUS. ZAG1 mutants exhibited a loss of determinacy, but the identity of reproductive organs was largely unaffected. This suggested a redundancy in maize sex organ specification that led to the identification and cloning of a second AGAMOUS homolog, ZMM2, that has a pattern of expression distinct from that of ZAG1. C-function organ identity in maize (as defined by the A, B, C model of floral organ development) may therefore be orchestrated by two closely related genes, ZAG1 and ZMM2, with overlapping but nonidentical activities.

M. Mena, B. A. Ambrose, M. F. Yanofsky, R. J. Schmidt, Department of Biology and Center for Molecular Genetics, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA.
R. B. Meeley and S. P. Briggs, Pioneer Hi-Bred International, Box 7300, Johnston, IA 50131, USA.
*   Present address: Universidad Politecnica de Madrid, Depto. de Biotecnología, ETSI Agronomos, 28040 Madrid, Spain.

dagger    To whom correspondence should be addressed. E-mail: rschmidt{at}ucsd.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)