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. 2013 Apr 1;8(4):e60505. doi: 10.1371/journal.pone.0060505

Figure 6. Proposed Model of Regulation of Floral Organ Abscission, Inflorescence Meristem Maintenance, and Senescence by COI1.

Figure 6

Working model of floral organ abscission. Based on the progression, in one model, floral organ abscission can be divided into 4 phases. Phase 1, pre-abscission phase where abscission zones (organ boundaries) are established in the early development, Phase 2 where abscission cells acquire competence to abscission signals while structurally dissolution of middle lamellae is observed, Phase 3 where abscission cells are activated when cell wall loosening is occurring, and Phase 4 where cell repair is observed in the post abscission trans-differentiation phase. Previously studied regulators in floral organ abscission are included in this model: DAB4/COI1. BOP1/2 (BLADE ON PETIOLES 1/2), HWS (HAWAIIAN SKIRT), PGs (Polygalacturonases). PMEs (Pectin methyltransferases), EXP (Expansins), IDA (INFLORESCENCE DEFICIENT IN ABSCISSION) and NEV (NEVERSHED).