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Spatiotemporal control of cell growth by CUC3 shapes leaf margins.

Development. 2020 Mar 18;147(6)
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摘要


How a shape arises from the coordinated behavior of cells is one of the most fascinating questions in developmental biology. In plants, fine spatial and temporal controls of cell proliferation and cell expansion sustain differential growth that defines organ shape and size. At the leaf margin of Arabidopsis thaliana, interplay between auxin transport and transcription factors named CUP SHAPED COTYLEDON (CUCs), which are involved in the establishment of boundary domain identity, were reported to trigger differential growth, leading to serration. Cellular behaviors behind these differential growths remain scarcely described. Here, we used 3D and time lapse imaging on young leaves at different stages of development to determine the sequence of cellular events resulting in leaf serrations. In addition, we showed that the transcription factor CUC3 is a negative regulator of cell growth and that its expression dynamics in a small number of cells at the leaf margin is tightly associated with the control of differential growth.

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