The effect of hydrostatic vs. shock pressure treatment of plant seeds

18th APS-SCCM; 24th AIRAPT

Appleby-Thomas, G.J.^1 ; Mustey, A.^1 ; Leighs, J.A.^1 ; Appleby, G.J.^1 ; Wood, D.C.^1 ; Hazael, R.^2 ; McMillan, P.F.^2 ; Hazell, P.J.^3

Cranfleld Defence and Security, Cranfleld University, Defence Academy of the UK, Shrivenham

SN6 8LA, United Kingdom^1

Department of Chemistry, University College London, 20 Gordon Street, London

WC1H 0AJ, United Kingdom^2

School of Engineering and Information Technology, University of New South Wales, UNSW Canberra, Northcott Drive, Canberra

ACT

2600, Australia^3

关键词: Bacterial contamination;    Damage mechanism;    Dynamic experiment;    Germination test;    Germination time;    Piston cylinders;    Shock compressions;    Shock pressure;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/500/18/182025/pdf
DOI  :  10.1088/1742-6596/500/18/182025

来源: IOP

【 摘 要 】

The hydrostatic pressure and shock response of plant seeds has been investigated antecedently, primarily driven by interest in reducing bacterial contamination of crops and the theory of panspermia, respectively. However, comparisons have not previously been made between these two methods ofapplying pressure to plant seeds. Here such a comparison has been undertaken based on the premise that any correlations in collected data may provide a route to inform understanding of damage mechanisms in the seeds under test. In this work two varieties of plant seeds were subjected to hydrostatic pressure via a non-end-loaded piston cylinder setup and shock compression via employment of a 50 mm bore, single stage gas gun using the flyer plate technique. Results from germination tests of recovered seed samples have been compared and contrasted, and initial conclusions made regarding causes of trends in the resultant data-set. Data collected has shown that cress seeds are extremely resilient to static loading, whereas the difference in the two forms of loading is negligible for lettuce seeds. Germination time has been seen to extend dramatically following static loading of cress seeds to greater than 0.4 GPa. In addition, the cut-off pressure previously seen to cause 0% germination in dynamic experiments performed on cress seeds has now also been seen in lettuce seeds.