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- Monocarpic plants are plants that die after producing fruits.
- When these plants reach certain number of fruits, flower production stops and cells responsible for growth cease dividing.
- This process of cessation is called proliferative arrest which ensures that nutrient is available for the formation of seeds.
- Proliferative arrest is an agricultural interest because it influences the flowering time scale and fruit production.
- The mechanism behind the initiation of the flowering period is well studied.
- However, the regulatory pathways and cellular processes that take part in the flowering cessation and triggering proliferative arrest is not well understood.
- Researchers identified the molecular and cellular changes associated with cell division and tissue growth in the shoot apical meristem throughout the flowering time period and proliferative arrest.
- Shoot apical meristem is the region of a plant that contains multipotent stem cells responsible for the development of plant organs above the ground.[1]
- Researchers discovered that before proliferative arrest occurs, cytokinin signaling was suppressed.
- Cytokinin is a plant hormone that induces cytokinesis or plant growth.[2]
- Additionally, researchers observed that repression of type B cyclins and WUSCHEL is correlated with proliferative arrest.
- B cyclins are proteins involved in the process of cell cycle.[3]
- WUSCHEL is a master regulator involved in plant growth signaling.[4]
- These molecular changes were observed to go along with changes in cell number and size.
- A separate analysis revealed that a mutation in FUL does not trigger proliferative arrest.
- FUL is the gene associated with controlling flowering time, meristem identity and leaf formation.[5]
- The study determined two phases that lead to proliferative arrest: early reduction and late blocking of cytokinin-related events.
Sources:
Paz Merelo et al. (2021). A cellular analysis of meristem activity at the end of flowering points to cytokinin as a major regulator of proliferative arrest in Arabidopsis, Current Biology. DOI: 10.1016/j.cub.2021.11.069
[1] https://www.nature.com/subjects/shoot-apical-meristem
[2] https://en.wikipedia.org/wiki/Cytokinin
[3] https://en.wikipedia.org/wiki/Cyclin_B
[4] https://link.springer.com/article/10.1007/s00299-020-02511-5
[5] https://pubmed.ncbi.nlm.nih.gov/21284215
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The Chromoscience uses AI-assisted tools to support the preparation and editing of science articles. Content is reviewed by the editor for clarity and consistency with the cited research before publication. Readers are encouraged to consult the original scientific publications for complete findings, methods, and limitations.
