PJB-2019-956
INVOLVEMENT OF ETHYLENE SYNTHETIC INHIBITORS IN REGULATING THE SENESCENCE OF CUT CARNATIONS THROUGH MEMBRANE INTEGRITY MAINTENANCE
Fahmy Hassan
Abstract
Postharvest senescence is a critical problem of carnation cut flowers limiting their transportation and subsequent marketing chain. This study, therefore, was designed to assess whether application of 1-methylcyclopropene (1-MCP), silver nano particles (AgNPs) and nitric oxide (NO) could prolong the vase life of cut carnations as well as the prospective physiological and biochemical mechanisms involved. 1-MCP was used at 0, 100, 200, and 300 mg m-3, AgNPs was applied at 0, 50, 100 and 150 mg L-1 and sodium nitroprusside (SNP) was used at 0, 0.1, 0.2, 0.3 and 0.4 mM as NO donor. All treatments significantly extended the flower life compared to untreated flowers more so with 300 mg m-3 1-MCP, 100 mg L-1 AgNPs or 0.3 mM NO. Exogenously 1-MCP, AgNPs or NO application could considerably improve the relative water content (RWC), reduce the malondialdehyde (MDA) content and increase the membrane stability index (MSI) in petals and therefore maintain the membrane integrity. Additionally, 1-MCP, AgNPs or NO treatments decreased ACS activity, while increased NOS activity and hence depressed the production of ethylene in carnation cut flowers. Therefore, the applied treatments in this investigation might reduce the ethylene output by inhibiting the ACS activity thus down-regulating the ethylene production in carnation cut flowers and hence prolonging the vase life. The current findings imply that 1-MCP, AgNPs or NO may impair ethylene signaling levels through cut carnation senescence. Altogether, application of exogenous 1-MCP, AgNPs or NO may provide a promising avenue to improve the postharvest performance of carnation cut flowers.
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