The cuajilote (Parmentiera edulis D.C.) tree produces fibrous fruits with a high content of lignocellulosic compounds. However, this fruit and their fibers have been scarcely studied. For this reason, an integral study of their cellular architecture, physicochemical, micromechanical, and structural properties in two maturity stages were carried out. Physicochemical tests, light, confocal and electron microscopy, microindentation, and X‐ray diffraction were used for the characterization of fruit and their fibers. Chemical analysis showed that the unripe fruits have the highest cellulose content (42.17%), but in ripe fruit the cellulose content decreases (32.76%) while lignin content increases from 35.26 to 40.79%, caused by the lignification of the sclerenchyma fibers. Microstructural and micromechanical studies in the different regions of the fruit provided relevant information about its cellular architecture, distribution of lignocellulosic compounds and its role in the micromechanical properties of their fibers. The thickening cell wall of sclerenchyma fibers was caused by the cellular lignification of the ripe fruits. According to the physicochemical and structural studies, cuajilote fibers are comparable to other fibers obtained from crops rich in lignocellulosic compounds. The current study provided new knowledge about the cellular architecture of fruit and criteria for selecting the ripening stage adequate for the extraction of cellulose or lignin. Furthermore, information regarding the micromechanical properties of their fibers and which structural arrangement could be more convenient for mechanical reinforcement of biodegradable materials was obtained.

中文翻译：

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使用不同显微镜技术研究瓜果果（Parmentiera edulis DC）的细胞结构和微机械特性。

cuajilote ( Parmentiera edulisDC) 树产生具有高含量木质纤维素化合物的纤维状果实。然而，这种水果及其纤维几乎没有被研究过。因此，对它们在两个成熟阶段的细胞结构、物理化学、微机械和结构特性进行了整体研究。物理化学测试、光、共聚焦和电子显微镜、显微压痕和 X 射线衍射用于表征水果及其纤维。化学分析表明，未成熟果实的纤维素含量最高（42.17%），但成熟果实中纤维素含量降低（32.76%），而木质素含量从 35.26% 增加到 40.79%，这是由厚壁组织纤维的木质化引起的。果实不同区域的微观结构和微观力学研究提供了有关其细胞结构、木质纤维素化合物的分布及其在其纤维微观力学特性中的作用的相关信息。厚壁组织纤维的细胞壁增厚是由成熟果实的细胞木质化引起的。根据物理化学和结构研究，cuajilote 纤维与从富含木质纤维素化合物的作物中获得的其他纤维相当。目前的研究提供了关于水果细胞结构的新知识，以及选择适合提取纤维素或木质素的成熟阶段的标准。此外，