Geometric and mechanical guidance: Role of stigmatic epidermis in early pollen tube pathfinding in arabidopsis
Lucie Riglet, Catherine Quilliet, Christophe Godin, Karin John, Isabelle Fobis-Loisy, Roeland Merks, Roeland Merks, Roeland Merks, Roeland Merks
TL;DR
The paper explores how pollen tubes navigate in Arabidopsis by analyzing the role of the stigmatic epidermis's mechanical and geometric properties.
Contribution
The study introduces a novel multidisciplinary approach combining biology, geometry, and mechanics to explain pollen tube guidance.
Findings
Pollen tube directionality is tightly connected to the mechanical properties of stigmatic cells.
The papilla's geometry and cell wall rigidity work together to guide pollen tubes toward the base.
Mathematical modeling reveals that wild-type papillae impose directional guidance unlike mutant ktn1-5 cells.
Abstract
In Arabidopsis thaliana, successful fertilisation relies on the precise guidance of the pollen tube as it navigates through the female tissues to deliver sperm cells to ovules. While prior research has focused on pistil signals directing pollen tubes towards the ovules, the pollen tube growth within the stigmatic epidermis has received limited attention. Our recent work comparing wild-type pollen tube paths on wild-type and katanin1-5 stigmatic cells, revealed a tight connection between pollen tube directionality and mechanical properties of the invaded stigmatic cell. Given that most mechanical properties of the stigmatic tissue are experimentally challenging to access, we used mathematical modelling to investigate the mechanisms underlying early pollen tube guidance through the papilla cell wall. We found that in ktn1-5, the wild-type pollen tube navigates freely across the curved…
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Taxonomy
TopicsPlant Reproductive Biology · Plant Molecular Biology Research · Polysaccharides and Plant Cell Walls