Abstract
Plant leaves show pronounced plasticity of size and form. In the classical, partially dominant mutation Lanceolate (La)1, the large compound leaves of tomato (Solanum lycopersicum) are converted into small simple ones. We show that LA encodes a transcription factor from the TCP family2,3 containing an miR319-binding site4. Five independent La isolates are gain-of-function alleles that result from point mutations within the miR319-binding site and confer partial resistance of the La transcripts to microRNA (miRNA)-directed inhibition. The reduced sensitivity to miRNA regulation leads to elevated LA expression in very young La leaf primordia and to precocious differentiation of leaf margins. In contrast, downregulation of several LA-like genes using ectopic expression of miR319 resulted in larger leaflets and continuous growth of leaf margins. Our results imply that regulation of LA by miR319 defines a flexible window of morphogenetic competence along the developing leaf margin that is required for leaf elaboration.
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Acknowledgements
We wish to thank E. Lifschitz5 (Technion), the C.M. Rick Tomato Genetics Resource Center and Clemson University Genomics Institute for materials, Navot Ori for unearthing la-6, and R. Fluhr, E. Hornstein, Z. Lippman, D. Weigel, S. Hake, J. Bowman and members of our laboratories for discussions and criticism. The work was supported by grants from the US-Israel Binational Agricultural Research and Development Fund, the European Union (MechPlant project) and the Israel Science Foundation (ISF) to N.O.; from ISF, MINERVA, The US-Israel Binational Science Foundation and Lubin Center for Plant Biotechnology to Y.E.; from the German-Israeli Foundation for Scentific Research and Development to Y.E. and N.O.; and from the German-Israeli Project Cooperation to Y.E. and D.Z.
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All authors contributed to the experiments and their interpretation. N.O., D.Z. and Y.E. directed the experiments, and N.O. and Y.E. wrote the manuscript.
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Supplementary information
Supplementary Fig. 1
The Lanceolate syndrome in leaves and flowers. (PDF 619 kb)
Supplementary Fig. 2
Genetic and molecular characterization of LA. (PDF 473 kb)
Supplementary Fig. 3
The LA-like protein family. (PDF 999 kb)
Supplementary Fig. 4
Quantification of LA and Tkn2/LeT6 expression in genotypes representing a gradient of LA activity. (PDF 358 kb)
Supplementary Fig. 5
Heterochronic differences in wild-type and la-6 leaf morphology. (PDF 564 kb)
Supplementary Fig. 6
Genetic interactions of La-2 with other leaf shape mutants. (PDF 291 kb)
Supplementary Table 1
Primers used in this study (PDF 19 kb)
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Ori, N., Cohen, A., Etzioni, A. et al. Regulation of LANCEOLATE by miR319 is required for compound-leaf development in tomato. Nat Genet 39, 787–791 (2007). https://doi.org/10.1038/ng2036
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DOI: https://doi.org/10.1038/ng2036
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