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Mechanical buckling can pattern the light-diffracting cuticle of Hibiscus trionum.

ABSTRACT: Many species have cuticular striations that play a range of roles, from pollinator attraction to surface wettability. In Hibiscus trionum, the striations span multiple cells at the base of the petal to form a pattern that produces a type of iridescence. It is postulated, using theoretical models, that the pattern of striations could result from mechanical instabilities. By combining the application of mechanical stress with high-resolution imaging, we demonstrate that the cuticle buckles to create a striated pattern. Through mechanical modeling and cryo-SEM fractures, we show that the cuticle behaves like a bilayer system with a stiff film on a compliant substrate. The pattern of buckling aligns with the direction of the stress to create a larger-scale pattern. Our findings contribute to the understanding of the formation of tissue-wide patterns in living organisms.

SUBMITTER: Airoldi CA

PROVIDER: S-EPMC9697994 | biostudies-literature | 2021 Sep

REPOSITORIES: biostudies-literature

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Mechanical buckling can pattern the light-diffracting cuticle of Hibiscus trionum.

Airoldi Chiara A CA Lugo Carlos A CA Wightman Raymond R Glover Beverley J BJ Robinson Sarah S

Cell reports 20210901 11

Many species have cuticular striations that play a range of roles, from pollinator attraction to surface wettability. In Hibiscus trionum, the striations span multiple cells at the base of the petal to form a pattern that produces a type of iridescence. It is postulated, using theoretical models, that the pattern of striations could result from mechanical instabilities. By combining the application of mechanical stress with high-resolution imaging, we demonstrate that the cuticle buckles to crea ...[more]

PMID: 34525367

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