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A Lignin Molecular Brace Controls Precision Processing of Cell Walls Critical for Surface Integrity in Arabidopsis

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Title
A Lignin Molecular Brace Controls Precision Processing of Cell Walls Critical for Surface Integrity in Arabidopsis
Author(s)
Yuree Lee; Taek Han Yoon; Jiyoun Lee; So Yeon Jeon; Jae Ho Lee; Mi Kyoung Lee; Huize Chen; Ju Yun; Se Yun Oh; Xiaohong Wen; Hui Kyung Cho; Hyunggon Mang; June M. Kwak
Publication Date
2018-05
Journal
CELL, v.173, no.6, pp.1468 - 1480
Publisher
CELL PRESS
Abstract
The cell wall, a defining feature of plants, provides a rigid structure critical for bonding cells together. To overcome this physical constraint, plants must process cell wall linkages during growth and development. However, little is known about the mechanism guiding cell-cell detachment and cell wall remodeling. Here, we identify two neighboring cell types in Arabidopsis that coordinate their activities to control cell wall processing, thereby ensuring precise abscission to discard organs. One cell type produces a honeycomb structure of lignin, which acts as a mechanical "brace" to localize cell wall breakdown and spatially limit abscising cells. The second cell type undergoes transdifferentiation into epidermal cells, forming protective cuticle, demonstrating de novo specification of epidermal cells, previously thought to be restricted to embryogenesis. Loss of the lignin brace leads to inadequate cuticle formation, resulting in surface barrier defects and susceptible to infection. Together, we show how plants precisely accomplish abscission ª 2018 Elsevier Inc.
URI
https://pr.ibs.re.kr/handle/8788114/4521
ISSN
0092-8674
Appears in Collections:
Center for Plant Aging Research (식물 노화·수명 연구단) > Journal Papers (저널논문)
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