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KATANIN-dependent mechanical properties of the stigmatic cell wall mediate the pollen tube path in Arabidopsis.

Published version
Peer-reviewed

Type

Article

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Authors

Riglet, Lucie 
Rozier, Frédérique 
Kodera, Chie 
Bovio, Simone 

Abstract

Successful fertilization in angiosperms depends on the proper trajectory of pollen tubes through the pistil tissues to reach the ovules. Pollen tubes first grow within the cell wall of the papilla cells, applying pressure to the cell. Mechanical forces are known to play a major role in plant cell shape by controlling the orientation of cortical microtubules (CMTs), which in turn mediate deposition of cellulose microfibrils (CMFs). Here, by combining imaging, genetic and chemical approaches, we show that isotropic reorientation of CMTs and CMFs in aged Col-0 and katanin1-5 (ktn1-5) papilla cells is accompanied by a tendency of pollen tubes to coil around the papillae. We show that this coiled phenotype is associated with specific mechanical properties of the cell walls that provide less resistance to pollen tube growth. Our results reveal an unexpected role for KTN1 in pollen tube guidance on the stigma by ensuring mechanical anisotropy of the papilla cell wall.

Description

Keywords

A. thaliana, KATANIN, mechanical anisotropy, plant biology, pollen tube guidance, stigma papilla, Arabidopsis, Arabidopsis Proteins, Cell Wall, Flowers, Gene Expression Regulation, Plant, Katanin, Microfibrils, Microtubules, Pollen Tube

Journal Title

Elife

Conference Name

Journal ISSN

2050-084X
2050-084X

Volume Title

9

Publisher

eLife Sciences Publications, Ltd