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First published online September 1, 2004
doi: 10.1242/10.1242/dev.01338

Development 131, 4401-4412 (2004)
Published by The Company of Biologists 2004
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Review

Compound leaves: equal to the sum of their parts?

Connie Champagne and Neelima Sinha*

Section of Plant Biology, University of California, 1 Shields Avenue, Davis, CA 95616, USA

* Author for correspondence (e-mail: nrsinha{at}ucdavis.edu)

SUMMARY

The leaves of seed plants can be classified as being either simple or compound according to their shape. Two hypotheses address the homology between simple and compound leaves, which equate either individual leaflets of compound leaves with simple leaves or the entire compound leaf with a simple leaf. Here we discuss the genes that function in simple and compound leaf development, such as KNOX1 genes, including how they interact with growth hormones to link growth regulation and development to cause changes in leaf complexity. Studies of transcription factors that control leaf development, their downstream targets, and how these targets are regulated are areas of inquiry that should increase our understanding of how leaf complexity is regulated and how it evolved through time.




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© The Company of Biologists Ltd 2004