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. 2015 Dec 9;6:1052. doi: 10.3389/fpls.2015.01052

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Copyright © 2015 Hepworth and Pautot.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Summary of pathways that control the development of abscission zones (AZs). Placement of AZs (in red) are shown for (A) Arabidopsis flower, (B) tomato pedicel, and (C) Arabidopsis seed and dehiscence zone. (D) The current accepted model for abscission defines four key stages: differentiation of AZ cells (pink), AZ cells acquire competence to respond to hormone inductive signals (red), activation of abscission and detachment (red), and differentiation of a protective layer over the scar (blue). Red lettering, SAM-leaf boundary genes. Dashed lines, hypothetical pathway. IAA, auxin; BR, brassinosteroid; GA, gibberellin; ET, ethylene; CK, cytokinin; JA, jasmonic acid. Adapted from (Leibfried et al., 2005; Niederhuth et al., 2013).