Homologies in Leaf Form Inferred from KNOXI Gene Expression During Development

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Science  07 Jun 2002:
Vol. 296, Issue 5574, pp. 1858-1860
DOI: 10.1126/science.1070343

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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.

  • * These authors contributed equally to this work.

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

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

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

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