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Two Complementary Mechanisms Underpin Cell Wall Patterning during Xylem Vessel Development
Corresponding author: Staffan Persson
The evolution of the plant vasculature (维管) was essential for the emergence of terrestrial life. Xylem vessels (木质部导管) are solute-transporting (溶质运输) elements in the vasculature that possess secondary wall thickenings (次生壁加厚) deposited in intricate (复杂的) patterns. Evenly dispersed microtubule (MT; 微管) bands support the formation of these wall thickenings, but how the MTs direct cell wall synthesis during this process remains largely unknown. Cellulose (纤维素) is the major secondary wall constituent (组成) and is synthesized by plasma membrane(质膜)-localized cellulose synthases (CesAs) whose catalytic activity propels (驱动) them through the membrane. We show that the protein CELLULOSE SYNTHASE INTERACTING (CSI)1/POM2 is necessary to align the secondary wall CesAs and MTs during the initial phase of xylem vessel development in Arabidopsis thaliana and Oryza sativa (rice). Surprisingly, these MT-driven patterns successively become imprinted and sufficient to sustain the continued progression of wall thickening in the absence of MTs and CSI1/POM2 function. Hence, two complementary principles underpin (支撑) wall patterning during xylem vessel development.
通讯:Staffan Persson (https://findanexpert.unimelb.edu.au/display/person658388)
个人简介:2003年,瑞典隆德大学和美国北卡罗来纳州立大学联合博士学位;2008-2014年,被任命为马克斯-普朗克Group Leader;2015年,墨尔本大学生物科学院的R@MAP教授和三级ARC Future Fellow。
doi: https://doi.org/10.1105/tpc.17.00309
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