Model for the ethylene regulation of ovule senescence and pistil response to GA
. Proper ovules would be required to establish the fruit set response to GAs. Ethylene level would increase in ovules upon their senescence, accelerating the process and preventing the GA response. Ethylene can indirectly affect the GA response mechanism by promoting ovule senescence, or can also directly interfere with GA signalling (perception and/or response). GA, gibberellins; Et, ethylene; Sen, senescence.