English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Repetitive hygroscopic snapping movements in awns of wild oats

Lindtner, T., Uzan, A., Eder, M., Bar-On, B., & Elbaum, R. (2021). Repetitive hygroscopic snapping movements in awns of wild oats. Acta Biomaterialia, 135, 483-492. doi:10.1016/j.actbio.2021.08.048.

Item is

Basic

show hide
Genre: Journal Article

Files

show Files
hide Files
:
Article.pdf (Publisher version), 4MB
 
File Permalink:
-
Name:
Article.pdf
Description:
-
Visibility:
Restricted (Max Planck Institute of Colloids and Interfaces, MTKG; )
MIME-Type / Checksum:
application/pdf
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
License:
-

Locators

show

Creators

show
hide
 Creators:
Lindtner, Tom, Author
Uzan, Avihai, Author
Eder, Michaela1, Author              
Bar-On, Benny, Author
Elbaum, Rivka, Author
Affiliations:
1Michaela Eder, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863293              

Content

show
hide
Free keywords: Avena sterilis, Awns, Hygroscopically active movement, Seed dispersal, Robotic arm, Cellulose microfibrils
 Abstract: Wild oat (Avena sterilis) is a very common annual plant species. Successful seed dispersion support its wide distribution in Africa, Asia and Europe. The seed dispersal units are made of two elongated stiff awns that are attached to a pointy compartment containing two seeds. The awns bend and twist with changes in humidity, pushing the seeds along and into the soil. The present work reveals the material structure of the awns, and models their functionality as two-link robotic arms. Based on nano-to-micro structure analyses the bending and twisting hygroscopic movements are explained. The coordinated movements of two sister awns attached to one dispersal unit were followed. Our work shows that sister awns intersect typically twice every wetting-drying cycle. Once the awns cross each other, epidermal silica hairs are suggested to lock subsequent movements, resulting in stress accumulation. Sudden release of the interlocked awns induces jumps of the dispersal unit and changes in its direction. Our findings propose a new role to silica hairs and suggesting a new facet of wild oat seed dispersion. Reversible jumping mechanism in multiple-awn seed dispersal units mays serve as a blueprint for reversibly jumping robotic systems. Statement of significance : The seed dispersal unit of wild oats carries two elongated stiff awns covered by unidirectional silica hairs. The awns bend and twist with changes in humidity, pushing the seed capsule along and into the ground. We studied structures constructing the movement mechanism and modeled the awn as a two-link robotic arm. We show that sister awns, attached to the same seed capsule, intersect twice every drying cycle. Once the awns cross each other, the epidermal silica hairs lock any subsequent movements, causing stress accumulation. Sudden release of the interlocked awns may cause the dispersal unit to jump and change its direction. Our findings suggest a new role to silica hairs and a new dispersal mechanism in multiple-awn seed dispersal units.

Details

show
hide
Language(s): eng - English
 Dates: 2021-09-082021
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.actbio.2021.08.048
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Acta Biomaterialia
  Abbreviation : Acta Biomater.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 135 Sequence Number: - Start / End Page: 483 - 492 Identifier: ISSN: 1742-7061