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Cellular events and regulations during leaf margin morphogenesis in Arabidopsis thaliana

Abstract : How a shape arises from the coordinated behavior of cells is one of the most fascinating questions in developmental biology. Here we used the early stages of development of serrated leaves in Arabidopsis thaliana as a model to study the tight relation between cellular behaviour and morphogenesis. During Arabidopsis thaliana leaf development the fine control of cell proliferation and cell expansion sustains differential growth at the margin required for the formation of leaf outgrowth named teeth. In this model, differential growth is the result of interplay between auxin signaling and CUC transcription factors that are involved in the maintenance of boundary domain identity. To clarify the interconnected relations between patterns of CUC TFs and auxin responses as well as the cellular events behind serrations we used time-lapse experiments on vegetative primordia of lines expressing developmental and/or auxin response reporters. Our results revealed a tight and dynamic control of differential growth at the leaf margin and the critical involvement of CUC3 in the local repression of cell growth in combination with low auxin responses.
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Léo Serra. Cellular events and regulations during leaf margin morphogenesis in Arabidopsis thaliana. Vegetal Biology. Université Paris Saclay (COmUE), 2019. English. ⟨NNT : 2019SACLS102⟩. ⟨tel-02724721⟩



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