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First published online October 9, 2009; 10.1105/tpc.109.069948

The Plant Cell 21:3093-3104 (2009)
© 2009 American Society of Plant Biologists

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LYRATE Is a Key Regulator of Leaflet Initiation and Lamina Outgrowth in Tomato[C],[W],[OA]

Rakefet David-Schwartz, Daniel Koenig and Neelima R. Sinha1

Section of Plant Biology, University of California, Davis, California 95616

1 Address correspondence to nrsinha{at}ucdavis.edu.

Development of the flattened laminar structure in plant leaves requires highly regulated cell division and expansion patterns. Although tight regulation of these processes is essential during leaf development, leaf shape is highly diverse across the plant kingdom, implying that patterning of growth must be amenable to evolutionary change. Here, we describe the molecular identification of the classical tomato (Solanum lycopersicum) mutant lyrate, which is impaired in outgrowth of leaflet primodia and laminar tissues during compound leaf development. We found that the lyrate phenotype results from a loss-of-function mutation of the tomato JAGGED homolog, a well-described positive regulator of cell division in lateral organs. We demonstrate that LYRATE coordinates lateral outgrowth in the compound leaves of tomato by interacting with both the KNOX and auxin transcriptional networks and suggest that evolutionary changes in LYRATE expression may contribute to the fundamental difference between compound and simple leaves.




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[Abstract] [Full Text] [PDF]


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