Here, different tissue surfaces of tomato root were characterized employing atomic force microscopy on day 7 and day 21 of growth through Young's modulus and plasticity index. These parameters provide quantitative information regarding the mechanical behavior of the tomato root under fresh conditions in different locations of the cross-section of root [cell surface of the epidermis, parenchyma (Pa), and vascular bundles (Vb)]. The results show that the mechanical parameters depend on the indented region, tissue type, and growth time. Thereby, the stiffness increases in the cell surface of epidermal tissue with increasing growth time (from 9.19 ± 0.68 to 13.90 ± 1.68 MPa) and the cell surface of Pa tissue displays the opposite behavior (from 1.74 ± 0.49 to 0.48 ± 0.55); the stiffness of cell surfaces of Vb tissue changes from 10.60 ± 0.58 to 6.37 ± 0.53 MPa, all cases showed a statistical difference (p < 0.05). Viscoelastic behavior dominates the mechanical forces in the tomato root. The current study is a contribution to a better understanding of the cell mechanics behavior of different tomato root tissues during growth.

中文翻译：

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用原子力显微镜评价番茄根的纳米力学性能。

在这里，通过杨氏模量和可塑性指数，在生长的第7天和第21天，采用原子力显微镜对番茄根的不同组织表面进行了表征。这些参数提供了有关番茄新鲜根部在根部横截面的不同位置[表皮，薄壁组织（Pa）和血管束（Vb）的细胞表面]的力学行为的定量信息。结果表明，机械参数取决于压痕区域，组织类型和生长时间。因此，表皮组织细胞表面的硬度随生长时间的增加而增加（从9.19±0.68到13.90±1.68 MPa），而Pa组织的细胞表面表现出相反的行为（从1.74±0.49到0.48±0.55）；Vb组织细胞表面的硬度从10.60±0.58变为6。37±0.53 MPa，所有病例均显示统计学差异（p <0.05）。粘弹性行为主导着番茄根的机械力。当前的研究有助于更好地了解生长过程中不同番茄根组织的细胞力学行为。