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FINE CULM1 Encoding a TEOSINTE BRANCHED1-like TCP Transcription Factor Negatively Regulates Axillary Meristem
Wakana Tanaka1, Ami Ohyama1, Taiyo Toriba2
1Graduate School of Integrated Sciences for Life, Hiroshima University, 1-4-4 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8528 Japan.
Plant & Cell Physiology
|October 21, 2024
Summary
Rice FINE CULM1 (FC1) gene regulates axillary meristem formation, a key process for plant architecture and yield. FC1 mildly represses cell proliferation, promoting meristem development.
Area of Science:
- Plant Biology
- Developmental Biology
- Genetics
Background:
- Shoot branching is crucial for plant architecture and crop yield.
- Axillary meristem formation and bud outgrowth are key processes in shoot branching.
- The role of FINE CULM1 (FC1) in bud outgrowth is established, but its role in meristem formation is unclear.
Purpose of the Study:
- To investigate the role of rice FINE CULM1 (FC1) in axillary meristem formation.
- To understand the genetic mechanisms underlying axillary meristem development in rice.
Main Methods:
- Genetic analysis of rice mutants, including tab1 and fc1 single and double mutants.
- Morphological analysis of axillary meristem formation.
- Observation of cell proliferation and maintenance of stem/undifferentiated cells.
Main Results:
- The fc1 mutation suppressed the loss of axillary meristems in the tab1 mutant.
- Axillary meristem formation was accelerated in fc1 mutants compared to wild type.
- FC1 negatively regulates axillary meristem formation by repressing cell proliferation.
Conclusions:
- FC1 plays a dual role in shoot branching: repressing bud outgrowth and negatively regulating axillary meristem formation.
- FC1's function in meristem formation involves the regulation of cell proliferation.
- Understanding FC1's role provides insights into controlling plant architecture and crop yield.
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