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Stomatal setpoints and environmental responsiveness are sculpted by developmental trajectories
Monalisha Rath1, Nidhi Sharma1, Madhav Mani2
1Howard Hughes Medical Institute, Stanford, CA 94305, USA.
Current Biology : CB
|May 20, 2026
Summary
Plant stomata regulate gas and water exchange, with their density influenced by developmental plasticity. Diverse Arabidopsis accessions reveal how cellular parameters and lineage regimes shape environmental responsiveness.
Area of Science:
- Plant biology
- Developmental genetics
- Evolutionary botany
Background:
- Stomata are crucial for plant gas and water exchange, with their number and distribution influenced by genetic regulators and cell division dynamics.
- Understanding how these regulators coordinate and adapt to environmental changes is essential for optimizing leaf performance.
Purpose of the Study:
- To define developmental rules and constraints in the stomatal lineage using natural variation in Arabidopsis thaliana accessions.
- To identify flexible cellular parameters that contribute to developmental plasticity and phenotypic variation in stomatal patterning.
Main Methods:
- Leveraged natural variation in stomatal patterning across diverse Arabidopsis thaliana accessions.
- Developed live-cell imaging tools to track cellular behaviors during leaf growth under varying environmental conditions.
- Decomposed stomatal density variation into its developmental origins, including initiation, cell fate thresholds, proliferation, and cell coordination.
Main Results:
- Identified key cellular parameters contributing to stomatal number variation: stomatal initiation, cell size-based fate thresholds, proliferative capacity, and sister/neighbor cell coordination.
- Revealed two main stomatal lineage regimes: one with autonomous decisions and loose coordination, the other with extensive cell-cell coordination.
- Demonstrated regime-specific flexibility in response to environmental fluctuations, primarily mediated by a single division-related parameter.
Conclusions:
- Cellular parameters integrate into alternative developmental strategies that determine environmental responsiveness in plants.
- Developmental plasticity in stomatal lineage contributes significantly to phenotypic variation and adaptation to diverse environments.
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