Abstract

Lateral root (LR) formation is an example of a plant post-embryonic organogenesis event. LRs are issued from non-dividing cells entering consecutive steps of formative divisions, proliferation and elongation. The chromatin remodeling protein PICKLE (PKL) negatively regulates auxin-mediated LR formation through a mechanism that is not yet known. Here we show that PKL interacts with RETINOBLASTOMA-RELATED 1 (RBR1) to repress the LATERAL ORGAN BOUNDARIES-DOMAIN 16 (LBD16) promoter activity. Since LBD16 function is required for the formative division of LR founder cells, repression mediated by the PKL-RBR1 complex negatively regulates formative division and LR formation. Inhibition of LR formation by PKL-RBR1 is counteracted by auxin, indicating that, in addition to auxin-mediated transcriptional responses, the fine-tuned process of LR formation is also controlled at the chromatin level in an auxin-signaling dependent manner.

Keywords

chromatin remodeling; auxin signaling; de novo organogenesis

Published in

International Journal of Molecular Sciences
2021, Volume: 22, number: 8, article number: 3862
Publisher: MDPI

SLU Authors

• Miskolczi, Pal Csaba

  • Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences
    

• Robert, Stephanie

  • Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Botany
Biochemistry and Molecular Biology


Publication identifier

DOI: https://doi.org/10.3390/ijms22083862

Permanent link to this page (URI)

https://res.slu.se/id/publ/111948