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A regulatory module mediating temperature control of cell-cell communication facilitates tree bud dormancy release
Shashank K Pandey1, Jay Prakash Maurya1,2, Bibek Aryal1
1Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-901 87, Umeå, Sweden.
The EMBO Journal
|October 3, 2024
Summary
Low temperatures trigger tree bud dormancy release by opening cell-to-cell communication channels. A new factor, LIM1, activates the gibberellic acid pathway, controlling this crucial seasonal growth switch.
Area of Science:
- Plant Biology
- Molecular Biology
- Developmental Biology
Background:
- Cell-cell communication via plasmodesmata (PD) is vital for plant development.
- Low temperatures (LT) induce PD opening in tree buds, releasing dormancy and restoring shoot apex communication.
Purpose of the Study:
- Identify genetic factors regulating LT-induced PD opening and dormancy release in tree buds.
- Elucidate the role of a novel transcription factor in seasonal growth adaptation.
Main Methods:
- Genetic and cell-biological approaches were employed.
- Identified and characterized the Low-temperature-Induced MADS-box 1 (LIM1) transcription factor.
- Utilized mathematical modeling and experimental validation.
Main Results:
- LIM1 is an LT-induced activator of the gibberellic acid (GA) pathway.
- The LIM1-GA module mediates LT-induced PD opening by reducing callose accumulation.
- LIM1 and FT1 form a feedforward loop regulating GA signaling for dormancy release.
- Negative feedback of GA on LIM1 ensures robust temporal regulation of bud responses.
Conclusions:
- Discovered the LIM1-GA module as a key regulator of LT-induced plasmodesmata opening and tree bud dormancy release.
- Revealed a genetic link between temperature sensing, cell communication, and seasonal growth adaptation.
- Highlighted the importance of LIM1 in mediating seasonal growth aligned with environmental cues.
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