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首页> 外文期刊>Journal of Plant Biology >The relationship between lignin and morphological characteristics of the tracheary elements from cacao(Theobroma cacao L.) Hulls
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The relationship between lignin and morphological characteristics of the tracheary elements from cacao(Theobroma cacao L.) Hulls

机译：木质素与可可（Theobroma cacao L.）船体气管元素形态特征的关系

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摘要

Tracheary elements (TEs) were physically separated from the hulls of cacao pods(Theobroma cacao L). Their morphological features were extensively investigated with scanning electron microscopy and chemical characterization. Spiral TEs were covered with a thin layer of primary wall that had a web-like structure on its outer surface. These TEs had a spiral circularity diameter of 8.2 ± 0.6 μm and an estimated secondary wall thickness of about 2.1 ± 0.2 μm. Polarized microscopy analysis revealed that the cellulose microfibrils were aligned parallel to that thickening. Lignin content was 36.1%, with a 0.13:1.00 molar ratio of syringyl to guaiacyl units and a 1.09:1.00 molar ratio of erythronic acid and threonic acid. Total yields of the alkaline nitrobenzene oxidation and ozonation products were 324.5 and 148.8 μmol g-1 of extract-free TEs, respectively. Based on these morphological and lignin characteristics, we conclude that fully ripened cacao hulls exhibit the same features of secondary wall thickening as those seen at an earlier stage.
机译：气管元件（TEs）与可可豆荚（Theobroma cacao L）的船体物理分离。用扫描电子显微镜和化学表征对它们的形态特征进行了广泛的研究。螺旋TE覆盖着一层薄的主壁，该主壁的外表面具有网状结构。这些TE的螺旋圆度直径为8.2±0.6μm，估计的次级壁厚约为2.1±0.2μm。偏光显微镜分析表明，纤维素微纤维与增稠方向平行排列。木质素含量为36.1％，丁香酰基与愈创木酰基单元的摩尔比为0.13：1.00，赤藓酸和苏糖酸的摩尔比为1.09：1.00。碱性硝基苯氧化和臭氧化产物的总产量分别为无萃取物TEs的324.5和148.8μmolg-1 。基于这些形态和木质素特征，我们得出结论，完全成熟的可可壳具有与早期阶段相同的二次壁增厚特征。

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