质外体
内胚层
木质素
生物物理学
化学
生物发生
细胞壁
聚合
细胞外
细胞生物学
植物
生物
生物化学
聚合物
有机化学
基因
作者
Yi‐Qun Gao,Jinquan Huang,Guilhem Reyt,Tao Song,Ashley Love,David Tiemessen,Pengju Xue,Wen‐Kai Wu,Michael W. George,Xiao‐Ya Chen,Dai‐Yin Chao,Gabriel Castrillo,David E. Salt
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2023-10-27
卷期号:382 (6669): 464-471
被引量:25
标识
DOI:10.1126/science.adi5032
摘要
Functionally similar to the tight junctions present in animal guts, plant roots have evolved a lignified Casparian strip as an extracellular diffusion barrier in the endodermis to seal the root apoplast and maintain nutrient homeostasis. How this diffusion barrier is structured has been partially defined, but its lignin polymerization and assembly steps remain elusive. Here, we characterize a family of dirigent proteins (DPs) essential for both the localized polymerization of lignin required for Casparian strip biogenesis in the cell wall and for attachment of the strip to the plasma membrane to seal the apoplast. We reveal a Casparian strip lignification mechanism that requires cooperation between DPs and the Schengen pathway. Furthermore, we demonstrate that DPs directly mediate lignin polymerization as part of this mechanism.
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