Wound repair in plants guided by cell geometry

Area of Science:

• Plant Biology
• Developmental Biology
• Cell Biology

Background:

• Multicellular organisms exhibit robust organ shape and regenerative capabilities.
• Restoration of organ shape after damage is a complex process driven by collective cell behavior.

Purpose of the Study:

• To investigate the cellular mechanisms underlying plant root shape restoration after tip removal.
• To understand how individual cell behaviors contribute to organ-level morphogenesis.

Main Methods:

• Surgical removal of the plant root tip.
• Combination of experimental approaches and computational modeling.
• Analysis of cell geometry, growth patterns, and microtubule dynamics.

Main Results:

• Transient activation of growth conflicts following injury is crucial for shape restoration.
• Non-uniform growth creates cell geometry changes, converting cuboidal to rhomboidal cells.
• Rhomboidal cells exhibit anisotropic growth and atypical division planes, guided by microtubule dynamics.
• Daughter cells redirect cell files along inclined paths, restoring the tapered root shape.

Conclusions:

• Plant root regeneration involves a two-step process: growth conflict-induced shape changes followed by reoriented growth and division.
• Local cell geometries, driven by growth conflicts, guide self-organized morphogenesis during wound repair.
• This mechanism highlights the interplay between cell shape, growth dynamics, and microtubule organization in establishing organ morphology.