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首页> 外文期刊>Carbohydrate research >Comparison of celery (Apium graveolens L.) collenchyma and parenchyma cell wall polysaccharides enabled by solid-state C-13 NMR
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Comparison of celery (Apium graveolens L.) collenchyma and parenchyma cell wall polysaccharides enabled by solid-state C-13 NMR

机译：固态C-13 NMR支持比较芹菜（Apium graveolens L.）肾上腺和实质细胞壁多糖

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Collenchyma cells with their thickened walls are one of specific mechanical support tissues for plants, while parenchyma cells are thin walled and serve multiple functions. The parenchyma tissue is what you enjoy eating, while collenchyma, because of its fibrous nature, is not so attractive. Celery is a useful model for comparing the cell walls (CWs) of the two cell types such as collenchyma and parenchyma. However, to date, the structural characteristics of collenchyma and parenchyma cell walls from the same plant have not been compared. Monosaccharide composition suggested the collenchyma cell walls contained less pectin but more hemicellulose in comparison to parenchyma. High-resolution solid-state NMR spectra of highly mobile pectins revealed that the arabinan signals were more evident in the collenchyma spectrum, while galactan showed a much stronger resonance in the parenchyma spectrum. In addition, methyl esterified and non-esterified galacturonic acid signals were observed in parenchyma CWs, but only the latter one appeared in the collenchyma. The ratio of cellulose surface/interior obtained from CP/MAS spectra for collenchyma suggested the cellulose microfibrils were similar to 2.4 nm, while in the parenchyma, these were somewhat larger. X-ray diffraction indicated the size of the cellulose microfibrils were the same for both types of CWs. (C) 2015 Published by Elsevier Ltd.
机译：壁厚的Collenchyma细胞是植物的特定机械支持组织之一，而实质细胞薄壁且具有多种功能。薄壁组织是您喜欢吃的东西，而由于其纤维性质，而薄层组织并不那么吸引人。芹菜是一种有用的模型，用于比较两种细胞类型（例如干细胞瘤和薄壁组织）的细胞壁（CW）。但是，迄今为止，尚未比较同一植物中的肾小管和薄壁细胞壁的结构特征。单糖的组成表明，与实质相比，collenchyma细胞壁含有较少的果胶，但含有更多的半纤维素。高流动性果胶的高分辨率固态NMR光谱显示，阿拉伯聚糖信号在干细胞层光谱中更为明显，而半乳聚糖在实质细胞谱中显示出更强的共振。此外，在薄壁组织连续波中观察到甲基酯化和未酯化的半乳糖醛酸信号，但只有一个在半乳糖体中出现。从CP / MAS光谱获得的胶原蛋白的纤维素表面/内部比率，表明纤维素微原纤维与2.4 nm相似，而在实质中，纤维素微原纤维则更大一些。 X射线衍射表明，两种类型的CW的纤维素微纤维的尺寸均相同。 （C）2015由Elsevier Ltd.出版

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