Related Experiment Video
Updated: May 21, 2026

In Situ Hybridization for the Precise Localization of Transcripts in Plants
Published on: November 23, 2011
The bZIP Transcription Factor PERIANTHIA: A Multifunctional Hub for Meristem Control
Annette T Maier1, Sandra Stehling-Sun, Sarah-Lena Offenburger
1Department of Stem Cell Biology, Centre for Organismal Studies Heidelberg, Heidelberg University Heidelberg, Germany.
Abstract:
As sessile organisms, plants are exposed to extreme variations in environmental conditions over the course of their lives. Since plants grow and initiate new organs continuously, they have to modulate the underlying developmental program accordingly to cope with this challenge. At the heart of this extraordinary developmental plasticity are pluripotent stem cells, which are maintained during the entire life-cycle of the plant and that are embedded within dynamic stem cell niches. While the complex regulatory principles of plant stem cell control under artificial constant growth conditions begin to emerge, virtually nothing is known about how this circuit adapts to variations in the environment. In addition to the local feedback system constituted by the homeodomain transcription factor WUSCHEL (WUS) and the CLAVATA signaling cascade in the center of the shoot apical meristem (SAM), the bZIP transcription factor PERIANTHIA (PAN) not only has a broader expression domain in SAM and flowers, but also carries out more diverse functions in meristem maintenance: pan mutants show alterations in environmental response, shoot meristem size, floral organ number, and exhibit severe defects in termination of floral stem cells in an environment dependent fashion. Genetic and genomic analyses indicate that PAN interacts with a plethora of developmental pathways including light, plant hormone, and meristem control systems, suggesting that PAN is as an important regulatory node in the network of plant stem cell control.
Related Concept Videos
Morphogenesis
Cell Signaling in Plants
Meristems and Plant Growth
Gene Regulation During Sporulation
Combinatorial Gene Control
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
Regulation of Transpiration by Stomata

