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Science 2 April 1999:
Vol. 284. no. 5411, pp. 154 - 156
DOI: 10.1126/science.284.5411.154
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Reports

The Maize rough sheath2 Gene and Leaf Development Programs in Monocot and Dicot Plants

Miltos Tsiantis, 1 Richard Schneeberger, 2* John F. Golz, 3 Michael Freeling, 2 Jane A. Langdale 1dagger

Leaves of higher plants develop in a sequential manner from the shoot apical meristem. Previously it was determined that perturbed leaf development in maize rough sheath2 (rs2) mutant plants results from ectopic expression of knotted1-like (knox) homeobox genes. Here, the rs2 gene sequence was found to be similar to the Antirrhinum PHANTASTICA (PHAN) gene sequence, which encodes a Myb-like transcription factor. RS2 and PHAN are both required to prevent the accumulation of knox gene products in maize and Antirrhinum leaves, respectively. However, rs2 and phan mutant phenotypes differ, highlighting fundamental differences in monocot and dicot leaf development programs.

1 Department of Plant Sciences, University of Oxford, South Parks Road, Oxford OX1 3BR, UK.
2 Department of Plant and Microbial Biology, University of California, Berkeley, CA 94720, USA.
3 Institute of Cell and Molecular Biology, The University of Edinburgh, King's Building, Mayfield Road, Edinburgh EH9 3JH, UK.
*   Present address: CERES Incorporated, 3007 Malibu Canyon, Malibu, CA 90265, USA.

dagger    To whom correspondence should be addressed. E-mail: jane.langdale{at}plants.ox.ac.uk

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