Abstract
Changes in gene regulation during differentiation are governed by networks of transcription factors. The Arabidopsis root endodermis is a tractable model to address how transcription factors contribute to differentiation. We used a bottom-up approach to understand the extent to which transcription factors required for endodermis differentiation can confer endodermis identity to a non-native cell-type. Our results show the transcription factors SHORTROOT and MYB36 alone have limited ability to induce ectopic endodermal features in the absence of additional cues. The stele-derived signaling peptide CIF2 stabilizes SHORTROOT-induced endodermis identity acquisition. The outcome is a partially impermeable barrier deposited in the sub-epidermal cell layer, which has a transcriptional signature similar to the endodermis. These results demonstrate other root cell-types can be forced to differentiate into endodermis and highlights a previously unappreciated role for receptor-kinase signaling in maintaining endodermis identity.
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