Leaf morphogenesis and differentiation are highly flexible processes, resulting in a large diversity of leaf forms. The development of compound leaves involves an extended morphogenesis stage compared with that of simple leaves, and the tomato (Solanum lycopersicum) mutant clausa (clau) exposes a potential for extended morphogenesis in tomato leaves. Here, we report that the CLAU gene encodes a MYB transcription factor that has evolved a unique role in compound-leaf species to promote an exit from the morphogenetic phase of tomato leaf development. We show that CLAU attenuates cytokinin signaling, and that clau plants have increased cytokinin sensitivity. The results suggest that flexible leaf patterning involves a coordinated interplay between transcription factors and hormones.

Centre of the Region Haná for Biotechnological and Agricultural Research Central Laboratories and Research Support Faculty of Science Palacky University Šlechtitelů 27 78371 Olomouc Czech Republic

Centre of the Region Haná for Biotechnological and Agricultural Research Central Laboratories and Research Support Faculty of Science Palacky University Šlechtitelů 27 78371 Olomouc Czech Republic Centre of the Region Haná for Biotechnological and Agricultural Research Department of Genetic Resources for Vegetables Medicinal and Special Plants Crop Research Institute 78371 Olomouc Czech Republic

Department of Plant Breeding and Genetics Max Planck Institute for Plant Breeding Research Cologne Germany Institut Jean Pierre Bourgin INRA AgroParisTech CNRS Université Paris Saclay 78026 Versailles Cedex France

The Robert H Smith Institute of Plant Sciences and Genetics in Agriculture and The Otto Warburg Minerva Center for Agricultural Biotechnology Hebrew University Rehovot 76100 Israel

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