Ethephon induced abscission in mango: physiological fruitlet responses

摘要: Fruitlet abscission of mango is typically very severe, causing considerable production losses worldwide. Consequently, a detailed physiological and molecular characterization fruitlet in required to describe the onset time-dependent course this process. To identify underlying key mechanisms abscission, ethephon, an ethylene releasing substance, was applied at two concentrations (600 ppm, 7200 ppm) during midseason drop stage mango. The process triggered by diffusing zone where it binds specific receptors thereby activating several responses cellular level. treatments reduced significantly capacity polar auxin transport through pedicel one day after treatment thereafter when compared untreated pedicels. transcript levels receptor genes MiETR1 MiERS1 were upregulated pericarp one, three days ethephon application with except for pedicel, fruitlet. In contrast, applications 600 ppm did not affect expression pericarp; however, over controls. Moreover, novel short versions identified detected more often treated than fruitlets all sampling times. Sucrose concentration control both treatments. conclusion, postulated that ethephon-induced commences reduction followed upregulation finally decrease sucrose fruitlets.