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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Unusual trichome structure and composition in mericarps of catchweed bedstraw (Galium aparine)
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Unusual trichome structure and composition in mericarps of catchweed bedstraw (Galium aparine)

机译：杂草稻草（Galium aparine）的花蜜中的异常毛状体结构和组成

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Catchweed bedstraw is famous for its ability to adhere to other objects due to the presence of numerous trichomes surrounding the stem and mericarps and on the surfaces of the leaves. These trichomes serve as an efficient vector for the movement of the propagules via animals. In this study, we examined the structure and composition of the mericarp trichomes by microscopic and immunocytochemical techniques to determine the distribution of polysaccharides. Trichomes present around the mericarps are distinguished by a pronounced hooked tip, resembling in many ways those on Velcro (TM). In semi-thin sections, the hooked area of the trichome contains little or no lumen but rather appears to be solidly composed of cell wall material. This solid hook appears to be divided into a plug-like zone of material and a highly thickened primary wall. These trichomes are also compositionally unique. They contain very little xyloglucan, even though other tissues in the plant reacted strongly with antibodies that recognize these polysaccharides. The distribution of pectin epitopes on these hooked trichomes was extremely distinctive, with each of the antibodies recognizing domains along the surface of the primary wall and/or in the plug area. Despite the heavily thickened nature of the walls of these trichomes, xylans were not present. Thus, the unique plugged, thickened, and hooked tip of these trichomes appears to be the result of a specific combination and distribution of various pectic polysaccharide molecules. This unusual wall composition may facilitate the formation of highly curved structures that might be difficult to form with the more rigid xyloglucans and xylans.
机译：稻草草因其粘附其他物体的能力而闻名，这是因为在茎和分生植物周围以及叶片表面上存在大量毛状体。这些毛状体是繁殖体通过动物运动的有效载体。在这项研究中，我们通过显微镜和免疫细胞化学技术检查了果皮毛状体的结构和组成，以确定多糖的分布。存在于美洲臀上的毛状体的特征是明显的钩状尖端，在许多方面与Velcro（TM）上的相似。在半薄部分，毛状体的钩状区域几乎没有或没有内腔，而是由细胞壁材料牢固地组成。这种坚固的钩子似乎分为材料的塞子状区域和高度加厚的主壁。这些毛状体在成分上也是独特的。即使植物中的其他组织与识别这些多糖的抗体强烈反应，它们也几乎不含木葡聚糖。果胶表位在这些钩状毛状体上的分布是非常独特的，每种抗体都识别沿初生壁表面和/或在塞子区域的结构域。尽管这些毛状体的壁严重增厚，但木聚糖并不存在。因此，这些毛状体的独特的堵塞，增厚和钩尖似乎是各种果胶多糖分子的特定结合和分布的结果。这种不寻常的壁成分可以促进高度弯曲的结构的形成，这可能难以用更刚性的木葡聚糖和木聚糖形成。

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