The Microtubule Cytoskeleton in Bryophytes

Area of Science:

• Plant Biology
• Cell Biology
• Evolutionary Biology

Background:

• Microtubules (MTs) are vital eukaryotic cytoskeletal components.
• Plant MT organization has evolved uniquely, with specific structures appearing or disappearing.
• Bryophytes represent early land plants crucial for understanding MT evolution.

Purpose of the Study:

• To review current knowledge of MT cytoskeleton organization in bryophytes.
• To highlight major MT array types and organizational factors in early land plants.
• To provide insights into MT adaptation during plant evolution.

Main Methods:

• Literature review integrating electron microscopy, genomics, genetics, and cell imaging.
• Focus on established models like Physcomitrium patens and Marchantia polymorpha.
• Inclusion of emerging hornwort models.

Main Results:

• Bryophytes exhibit distinct MT structures, some unique to plants (preprophase band, phragmoplast).
• Centrioles and flagella have been lost in many plant lineages, including bryophytes.
• Recent advances have significantly improved understanding of MT organization and function.

Conclusions:

• Bryophytes offer a key perspective on the evolution of plant MT organization.
• Understanding bryophyte MTs illuminates fundamental principles of cytoskeletal adaptation.
• This review synthesizes current data, paving the way for future research in plant cytoskeletal evolution.