Abstract
1-Methylcyclopropene (1-MCP) inhibits ethylene action and fruit quality achievement by binding to ethylene receptors. Developmental stage, timing, concentration and storage temperature may modulate 1-MCP effects. Ethylene and the antisenescent growth regulators polyamines (PAs) share a common precursor and may exert opposite effects. Nectarines (Prunus persica L. Batsch 'Stark Red Gold') were harvested and treated with 1-MCP for 12 h at 25°C, and then stored for 3 days at 25 or 4°C. At 25°C, 1-MCP strongly inhibited ethylene production and Pp-ACO gene expression, and development of quality parameters (softening, SSC, loss of acidity). At 4°C, ethylene production was not inhibited, but enhanced on the third day. A transient increase in endogenous PAs is associated with 1-MCP treatment, which at 4°C is accentuated, suggesting a combined negative effect of 1-MCP and cold stress.[...]
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