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Science 7 June 2002:
Vol. 296. no. 5574, pp. 1858 - 1860
DOI: 10.1126/science.1070343
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Reports

Homologies in Leaf Form Inferred from KNOXI Gene Expression During Development

Geeta Bharathan,1* Thomas E. Goliber,2* Christopher Moore,2dagger Sharon Kessler,2 Thinh Pham,2ddagger Neelima R. Sinha2§

KNOTTEDI-like homeobox (KNOXI) genes regulate development of the leaf from the shoot apical meristem (SAM) and may regulate leaf form. We examined KNOXI expression in SAMs of various vascular plants and found that KNOXI expression correlated with complex leaf primordia. However, complex primordia may mature into simple leaves. Therefore, not all simple leaves develop similarly, and final leaf morphology may not be an adequate predictor of homology.

1 Department of Ecology and Evolution, State University of New York, Stony Brook, NY 11794-5245, USA.
2 Section of Plant Biology, University of California-Davis, Davis, CA 95616, USA.
*   These authors contributed equally to this work.

dagger    Present address: Department of Genetics, Stanford University, Stanford, CA 94305, USA.

ddagger    Present address: Department of Pathology, Genentech, South San Francisco, CA 94080, USA.

§   To whom correspondence should be addressed. E-mail: nrsinha{at}ucdavis.edu

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