Role of BASIC PENTACYSTEINE transcription factors in a subset of cytokinin signaling responses

The Plant Journal : for Cell and Molecular Biology
Carly ShanksJ J Kieber

Abstract

Cytokinin plays diverse roles in plant growth and development, generally acting by modulating gene transcription in target tissues. The type-B Arabidopsis response regulators (ARR) transcription factors have emerged as primary targets of cytokinin signaling and are required for essentially all cytokinin-mediated changes in gene expression. The diversity of cytokinin function is likely imparted by the activity of various transcription factors working with the type-B ARRs to alter specific sets of target genes. One potential set of co-regulators modulating the cytokinin response are the BARLEY B-RECOMBINANT/BASIC PENTACYSTEINE (BBR/BPC) family of plant-specific transcription factors. Here, we show that disruption of multiple BPCs results in reduced sensitivity to cytokinin. Further, the BPCs are necessary for the induction of a subset of genes in response to cytokinin. We identified direct in vivo targets of BPC6 using ChIP-Seq and found an enrichment of promoters of genes differentially expressed in response to cytokinin. Further, a significant number of BPC6 regulated genes are also direct targets of the type-B ARRs. Potential cis-binding elements for a number of other transcription factors linked to cytokinin action are enrich...Continue Reading

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Citations

Jan 8, 2020·The Plant Journal : for Cell and Molecular Biology·Rosanna PetrellaVeronica Gregis
Sep 25, 2018·Current Biology : CB·Joanna K PolkoJoseph J Kieber

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