Plant Cell Walls - 17
311 Syllabus

Cortical Microtubules Determine the Orientation of Cellulose Microfibrils

Cellulose Fibrils & Microtubules have Parallel Orientation.

Drugs like Colchicine Disrupt Microtubule Orientation -> Random Microfibril Deposition

Microtubules Linked to Plasmalemma (Cytoplasmic Face) Act as Guides for Rosettes ->

The Blue Cell has been treated to show the pattern of the most recently deposited Cellulose. The image on the right is from the same cell but it is stained with antibodies for Tubulin which revel the Microtubules just beneath the Plasmalemma. It is clear that the orientation of the Microtubules is parallel to the orientation of the Cellulose Fibrils.

Polymerization of Cellulose -> Driving Force for Cellulose Depositiom

ATP-Driven Kinesin Motor might be involved in Rosette Movement

These are known for Movements of Organelles & Vesicles along Microtubules

Regulation of Polarity in Diffuse Growth

Unknown but could be due to Plant Growth Regulators like Auxin