Transcription Factor Dynamics in Plant Development

Plant development relies on precise regulation of gene expression. Transcription factors control developmental transitions such as the juvenile-to-adult phase change and flowering by binding DNA and orchestrating transcriptional programmes. Dynamic modulation of transcription factor activity is achieved through post-translational modifications, interactions with microRNAs and phytohormone signalling. In particular, the microRNA156–SPL module exemplifies a conserved circuit in which declining levels of miR156 permit gradual accumulation of SQUAMOSA promoter binding protein-like (SPL) transcription factors, thereby driving organ identity changes, leaf morphology, trichome distribution and reproductive competence. Phytohormones such as brassinosteroids, gibberellins and cytokinins further fine-tune this circuit by stabilising or degrading key transcription factors through phosphorylation and targeted proteolysis. Light and nutrient signals integrate with these molecular networks to ensure adaptive timing of developmental transitions across diverse plant species. The global significance of these dynamics is evident in crop improvement, where manipulation of transcription factor pathways can modulate yield, stress tolerance and phenology.

Research from Nature Portfolio

Recent studies have demonstrated that brassinosteroid biosynthesis directly influences vegetative phase change by modulating the stability of key transcription factors. A loss-of-function mutation in the DWARF5 gene, required for brassinosteroid production, was shown to delay phase change through reduced levels of SPL9 and miR172 and increased abundance of the repressor TOE1. A GSK3-like kinase, BIN2, phosphorylates both SPL9 and TOE1, targeting them for proteolytic degradation. These findings reveal a hormone-mediated mechanism in which brassinosteroids safeguard the accumulation of transcription factors that coordinate age-dependent developmental programmes.

Transcription Factor Dynamics in Plant Development publication trend

The graph below shows the total number of articles in transcription factor dynamics in plant development across all publications each year (not limited to Nature Index journals).

Technical terms

Transcription factor: A protein that binds specific DNA sequences to regulate gene transcription.

microRNA (miRNA): A short non-coding RNA that binds complementary mRNA transcripts to repress translation or induce degradation.

SQUAMOSA promoter binding protein-like (SPL) genes: A family of plant transcription factors targeted by miR156 that regulate developmental phase transitions.

Brassinosteroids: A class of plant steroid hormones that modulate growth and development by affecting gene expression and protein stability.

Phosphorylation: A post-translational modification in which a phosphate group is added to a protein, often altering its activity or stability.

References

1. Coordinated regulation of vegetative phase change by brassinosteroids and the age pathway in Arabidopsis. Nature Communications (2023).
2. Temporal regulation of vegetative phase change in plants. Developmental Cell (2024).
3. Developmental Functions of miR156-Regulated SQUAMOSA PROMOTER BINDING PROTEIN-LIKE (SPL) Genes in Arabidopsis thaliana. PLOS Genetics (2016).
4. Temporal Control of Trichome Distribution by MicroRNA156-Targeted SPL Genes in Arabidopsis thaliana. The Plant Cell (2010).