Attaching mechanism of dandelion seeds: results from morphology/structure and abscission force/angle

IF 1.3 4区 工程技术 Q4 ENGINEERING, BIOMEDICAL
Lixin Wang, Guangshun Liu, Shan-yin Li
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引用次数: 0

Abstract

Mature dandelion seeds can be easily abscised from their capitulum by a tiny vibration or a gentle wind, and the previous study has revealed their abscission mechanism, but the mechanism governing the attachment of immature dandelion seeds is still unclear. This paper aims to uncover the attaching mechanism by morphology/structure analysis and abscission force/angle measurement. Connecting region of the immature dandelion seeds consists of upper barbs from neighboring achenes, lower barbs of achene and their groove in capitulum. The upper barbs have hierarchical structures that form barb-barb interlock, the lower barbs and their groove produce barbs-groove wrapping, together endow the dandelion seeds with a firm attachment (abscission force >155.9 mN). The firm attachment weakens sharply with the growth of dandelion seeds, which attributes to the considerable changes in morphology/structure, showing the remarkable decrease of abscission angle (critical opened stage 37.1 ± 5.2°, full opened stage 11.6 ± 3.0°) and the tiny abscission force (10.67–0.35 mN). The results reveal the attaching mechanism of immature dandelion seeds, and may inspire some novel biomimetic designs for the controllable attachment/abscission materials.
蒲公英种子的附着机制:形态/结构和脱落力/角度的结果
成熟的蒲公英种子可以很容易地通过微小的振动或微风从其头状花序脱落,先前的研究已经揭示了其脱落机制,但控制未成熟蒲公英种子附着的机制尚不清楚。本文旨在通过形态/结构分析和脱落力/角度测量揭示附着机理。未成熟蒲公英种子的连接区由相邻瘦果的上倒刺、瘦果的下倒刺及其在头状花序中的凹槽组成。上部倒钩具有层次结构,形成倒钩-倒钩互锁,下部倒钩及其凹槽产生倒钩-凹槽包裹,共同赋予蒲公英种子牢固的附着(脱落力>155.9 mN)。随着蒲公英种子的生长,牢固的附着性急剧减弱,这归因于形态/结构的显著变化,表现为脱落角(临界开放期37.1±5.2°,全开期11.6±3.0°)和微小脱落力(10.67–0.35 mN)。研究结果揭示了未成熟蒲公英种子的附着机制,并可能为可控附着/脱落材料的仿生设计提供启示。
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来源期刊
Bioinspired Biomimetic and Nanobiomaterials
Bioinspired Biomimetic and Nanobiomaterials ENGINEERING, BIOMEDICAL-MATERIALS SCIENCE, BIOMATERIALS
CiteScore
2.20
自引率
0.00%
发文量
12
期刊介绍: Bioinspired, biomimetic and nanobiomaterials are emerging as the most promising area of research within the area of biological materials science and engineering. The technological significance of this area is immense for applications as diverse as tissue engineering and drug delivery biosystems to biomimicked sensors and optical devices. Bioinspired, Biomimetic and Nanobiomaterials provides a unique scholarly forum for discussion and reporting of structure sensitive functional properties of nature inspired materials.
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