Ethylene and auxin (IAA) are important regulators of abscission. IAA retards, whilst ethylene is a potent accelerator of the process. The general rule portrays that provided the flux of IAA to the abscission zone region is maintained; the cell separation is inhibited and abscission does not occur (Addicott, 1982; Brown, 1997).
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Ketsa, S., Rungruchkanont, K. (2007). Effect of inhibitors of auxin and ethylene on abscission development of Dendrobium inflorescences. In: Ramina, A., Chang, C., Giovannoni, J., Klee, H., Perata, P., Woltering, E. (eds) Advances in Plant Ethylene Research. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-6014-4_64
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