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DEFECTIVE KERNEL 1 promotes and maintains plant epidermal differentiation

Galletti, Roberta, Johnson, Kim L., Scofield, Simon ORCID:, San-Bento, Rita, Watt, Andrea M., Murray, James A. H. ORCID: and Ingram, Gwyneth C. 2015. DEFECTIVE KERNEL 1 promotes and maintains plant epidermal differentiation. Development 142 (11) , pp. 1978-1983. 10.1242/dev.122325

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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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Subjects: Q Science > QK Botany
Publisher: Company of Biologists
ISSN: 0950-1991
Date of First Compliant Deposit: 30 March 2016
Date of Acceptance: 7 April 2015
Last Modified: 05 May 2023 17:10

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