The strength of plants: theory and experimental methods to measure the mechanical properties of stems

Darshil Shah, Thomas Reynolds, Michael Ramage

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

From the stems of agricultural crops to the structural trunks of trees, studying the mechanical behaviour of plant stems is critical for both commerce and science. Plant scientists are also increasingly relying on mechanical test data for plant phenotyping. Yet there are neither standardised methods nor systematic reviews of current methods for the testing of herbaceous stems. We discuss the architecture of plant stems and highlight important micro- and macro-structural parameters that need to be controlled and accounted for when designing test methodologies, or that need to be understood to explain observed mechanical behaviour. Then, we critically evaluate various methods to test structural properties of stems, including flexural-bending (two-, three- and four-point bending) and axial-loading (tensile, compressive and buckling) tests. Recommendations are made on best practices. This review is relevant to fundamental studies exploring plant biomechanics, mechanical phenotyping of plants, and the determinants of mechanical properties in cell walls, as well as to application-focussed studies, such as in agro-breeding and forest-management projects, aiming to understand deformation processes of stem structures. The methods explored here can also be extended to other elongated, rod-shaped organs (e.g. petioles, midribs and even roots).
Original languageEnglish
JournalJournal of Experimental Botany
DOIs
Publication statusPublished - 7 Sept 2017

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