McCurdy David W, Patrick John W, Offler Christina E
Plant Science Group, School of Environmental and Life Sciences, The University of Newcastle, Newcastle NSW 2308, Australia.
Curr Opin Plant Biol. 2008 Dec;11(6):653-61. doi: 10.1016/j.pbi.2008.08.005. Epub 2008 Oct 10.
The formation of wall ingrowths increases plasma membrane surface areas of transfer cells involved in membrane transport of nutrients in plants. Construction of these ingrowths provides intriguing and diverse examples of localized wall deposition. Flange wall ingrowths resemble secondary wall thickenings of tracheary elements in morphology and probable mechanisms of deposition. By contrast, reticulate wall ingrowths, deposited as discrete papillate projections, branch and fuse to create a fenestrated wall labyrinth representing a novel form of localized wall deposition. Papillate wall ingrowths are initiated as patches of disorganized cellulosic material and are compositionally similar to primary walls, except for a surrounding layer of callose and enhanced levels of arabinogalactan proteins at the ingrowth/membrane interface. How this unusual form of localized wall deposition is constructed is unknown but may involve constraining cellulose-synthesizing rosette complexes at their growing tips.
壁内突的形成增加了参与植物营养物质膜运输的传递细胞的质膜表面积。这些内突的构建提供了有趣且多样的局部细胞壁沉积实例。凸缘壁内突在形态和可能的沉积机制上类似于管状分子的次生壁加厚。相比之下，网状壁内突以离散的乳头状突起形式沉积，分支并融合形成有窗孔的壁迷宫，代表了一种新型的局部细胞壁沉积形式。乳头状壁内突最初是无序纤维素材料的斑块，在组成上与初生壁相似，除了在内突/膜界面有一层胼胝质和增加水平的阿拉伯半乳聚糖蛋白。这种不寻常的局部细胞壁沉积形式是如何构建的尚不清楚，但可能涉及在其生长尖端限制纤维素合成的玫瑰花结复合体。
