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- W3138965545 abstract "Abstract We reveal how patterns of growth in response to environmental cues can produce curvature in biological structures by setting up mechanical stresses that cause elastic buckling. Nereocystis luetkeana are nearshore kelp with wide ruffled blades that minimize self-shading in slow flow, but narrow flat blades that reduce hydrodynamic drag in rapid flow. Previously we showed that blade ruffling is a plastic trait associated with a transverse gradient in longitudinal growth. Here we consider expansion and displacement of tissue elements due to growth in blades, and find that growth patterns are altered by tensile stress due to hydrodynamic drag, but not by shading or nutrients. When longitudinal stress in a blade is low in slow flow, blade edges grow faster than the midline in young tissue near the blade base. Tissue elements are displaced distally by expansion of younger proximal tissue. Strain energy caused by the transverse gradient in longitudinal growth is released by elastic buckling once the blade grows wide enough, producing ruffles distal to the region where the growth inhomogeneity started. If a blade experiences higher stress in rapid flow, the edges and midline grow at the same rate, so the blade becomes flat as these new tissue elements are displaced distally." @default.
- W3138965545 created "2021-03-29" @default.
- W3138965545 creator A5054574983 @default.
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- W3138965545 date "2021-03-15" @default.
- W3138965545 modified "2023-10-12" @default.
- W3138965545 title "How kelp in drag lose their ruffles: environmental cues, growth kinematics, and mechanical constraints govern curvature" @default.
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- W3138965545 doi "https://doi.org/10.1093/jxb/erab111" @default.
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- W3138965545 hasPublicationYear "2021" @default.
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