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Article Dans Une Revue (Article De Synthèse) Development (Cambridge, England) Année : 2015

DÉFECTIVE KERNEL 1 promotes and maintains plant epidermal differentiation

Résumé

During plant epidermal development, many cell types are generated from protodermal cells, a process requiring complex co-ordination of cell division, growth, endoreduplication and the acquisition of differentiated cellular morphologies. Here we show that the Arabidopsis phytocalpain DEFECTIVE KERNEL 1 (DEK1) promotes the differentiated epidermal state. Plants with reduced DEK1 activity produce cotyledon epidermis with protodermal characteristics, despite showing normal growth and endoreduplication. Furthermore, in non-embryonic tissues (true leaves, sepals), DEK1 is required for epidermis differentiation maintenance. We show that the HD-ZIP IV family of epidermis-specific differentiation promoting transcription factors are key, albeit indirect, targets of DEK1 activity. We propose a model in which DEK1 influences HD-ZIP IV gene expression, and thus epidermis differentiation, by promoting cell adhesion and communication in the epidermis.
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Dates et versions

hal-01538658 , version 1 (13-06-2017)

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R. Galletti, K. L. Johnson, S. Scofield, R. San-Bento, A. M. Watt, et al.. DÉFECTIVE KERNEL 1 promotes and maintains plant epidermal differentiation. Development (Cambridge, England), 2015, 142 (11), pp.1978-1983. ⟨10.1242/dev.122325⟩. ⟨hal-01538658⟩
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