ARABIDOPSIS THALIANA HOMEOBOX GENE 1 controls plant architecture by locally restricting environmental responses.
Mahwish EjazStefano BencivengaRafael TavaresMax BushRobert SablowskiPublished in: Proceedings of the National Academy of Sciences of the United States of America (2021)
The diversity and environmental plasticity of plant growth results from variations of repetitive modules, such as the basic shoot units made of a leaf, axillary bud, and internode. Internode elongation is regulated both developmentally and in response to environmental conditions, such as light quality, but the integration of internal and environmental signals is poorly understood. Here, we show that the compressed rosette growth habit of Arabidopsis is maintained by the convergent activities of the organ boundary gene ARABIDOPSIS THALIANA HOMEOBOX GENE 1 (ATH1) and of the gibberellin-signaling DELLA genes. Combined loss of ATH1 and DELLA function activated stem development during the vegetative phase and changed the growth habit from rosette to caulescent. Chromatin immunoprecipitation high-throughput sequencing and genetic analysis indicated that ATH1 and the DELLA gene REPRESSOR OF GA1-3 (RGA) converge on the regulation of light responses, including the PHYTOCHROME INTERACTING FACTORS (PIF) pathway, and showed that the ATH1 input is mediated in part by direct activation of BLADE ON PETIOLE (BOP1 and BOP2) genes, whose products destabilize PIF proteins. We conclude that an organ-patterning gene converges with hormone signaling to spatially restrict environmental responses and establish a widespread type of plant architecture.
Keyphrases
- genome wide
- genome wide identification
- arabidopsis thaliana
- copy number
- transcription factor
- plant growth
- human health
- dna methylation
- high throughput sequencing
- genome wide analysis
- life cycle
- lymph node
- pet ct
- squamous cell carcinoma
- neoadjuvant chemotherapy
- climate change
- cell wall
- locally advanced
- bioinformatics analysis
- sentinel lymph node