Elongation of wood fibers combines features of diffuse and tip growth

Details

Serval ID
serval:BIB_33616BFF22FF
Type
Article: article from journal or magazin.
Collection
Publications
Title
Elongation of wood fibers combines features of diffuse and tip growth
Journal
New Phytologist
Author(s)
Majda Mateusz, Kozlova Liudmila, Banasiak Alicja, Derba-Maceluch Marta, Iashchishyn Igor A., Morozova-Roche Ludmilla A., Smith Richard S., Gorshkova Tatyana, Mellerowicz Ewa J.
Publication state
Published
Issued date
10/2021
Peer-reviewed
Oui
Language
english
Abstract
Xylem fibers are highly elongated cells that are key constituents of wood, play major physiological roles in plants, comprise an important terrestrial carbon reservoir, and thus have enormous ecological and economic importance. As they develop, from fusiform initials, their bodies remain the same length while their tips elongate and intrude into intercellular spaces.
To elucidate mechanisms of tip elongation, we studied the cell wall along the length of isolated, elongating aspen xylem fibers and used computer simulations to predict the forces driving the intercellular space formation required for their growth.
We found pectin matrix epitopes (JIM5, LM7) concentrated at the tips where cellulose microfibrils have transverse orientation, and xyloglucan epitopes (CCRC-M89, CCRC-M58) in fiber bodies where microfibrils are disordered. These features are accompanied by changes in cell wall thickness, indicating that while the cell wall elongates strictly at the tips, it is deposited all over fibers. Computer modeling revealed that the intercellular space formation needed for intrusive growth may only require targeted release of cell adhesion, which allows turgor pressure in neighboring fiber cells to ‘round’ the cells creating spaces.
These characteristics show that xylem fibers’ elongation involves a distinct mechanism that combines features of both diffuse and tip growth.
Keywords
apical intrusive growth, cell expansion, fibers, poplar, wood development
Create date
10/06/2023 21:47
Last modification date
11/06/2023 6:04
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