Microtubule Organization in Plant Cells

Microtubules form a dynamic, filamentous network that underpins plant cell morphology, division and response to external stimuli. Organised predominantly as cortical arrays beneath the plasma membrane, these polymers guide the oriented deposition of cellulose microfibrils and thus determine mechanical anisotropy of the cell wall. Throughout the cell cycle, distinct microtubule structures emerge: interphase cortical arrays regulate cell expansion and directional growth, the preprophase band predicts the future division plane, the mitotic spindle ensures accurate chromosome segregation, and the phragmoplast directs cell plate formation. Microtubule dynamics—polymerisation, depolymerisation, bundling and severing—are modulated by microtubule-associated proteins, signalling pathways and hormonal cues. Emerging evidence reveals that three-dimensional cell geometry and intracellular trafficking intersect with microtubule organisation to fine-tune plant development and stress adaptation.

Research from Nature Portfolio

Recent studies have uncovered mechanisms by which specific microtubule-associated proteins confer spatial precision to three-dimensional cell wall patterning in xylem. One investigation demonstrated that MAP70 variants bend and bundle cortical microtubules within developing pit apertures, thereby sculpting arch-shaped cell wall deposits in metaxylem vessels. Another report revealed a ubiquitin-dependent pathway that regulates microtubule stability during stomatal closure. The E3 ligase MREL57 targets the microtubule-stabilising protein WDL7 for degradation in response to abscisic acid, enabling rapid cortical array disassembly and efficient stomatal pore constriction under drought stress.

Microtubule Organization in Plant Cells publication trend

The graph below shows the total number of articles in microtubule organization in plant cells across all publications each year (not limited to Nature Index journals).

Technical terms

Cortical microtubule array: A network of microtubules arranged parallel to the plasma membrane that directs cell wall component deposition.

Microtubule-associated protein (MAP): A regulatory factor that binds to microtubules, modulating their dynamics, stability or organisation.

Ubiquitin–proteasome system (UPS): A cellular machinery that tags proteins with ubiquitin for selective degradation by the proteasome.

E3 ligase: An enzyme within the UPS that confers substrate specificity for ubiquitination.

Abscisic acid (ABA): A plant hormone that mediates stress responses, including stomatal closure and cytoskeletal rearrangements.

References

1. Confined-microtubule assembly shapes three-dimensional cell wall structures in xylem vessels. Nature Communications (2023).
2. The E3 ligase MREL57 modulates microtubule stability and stomatal closure in response to ABA. Nature Communications (2021).
3. Spearmint targets microtubules by (−)-carvone. Horticulture Research (2024).
4. Cytoskeletal organization in isolated plant cells under geometry control. Proceedings of the National Academy of Sciences of the United States of America (2020).