Responses of 'Bing' and 'Rainier' sweet cherries to ethylene and 1-methylcyclopropene

'Bing' and 'Rainier' sweet cherry (Prunus avium L.) fruit treated with 1-methylcyclopropene (1-MCP) were stored at 20 degreesC in air or 35 muL-L-1 ethylene. Ethylene production by both 'Bing' and 'Rainier' fruit stored in air was transiently stimulated following 1-MCP treatments, however, there were no significant effects of 1-MCP on respiration rate. Exogenous ethylene stimulated respiration regardless of prior treatment with 1-MCP. Although 1-MCP treatment reduced the increase in 'Bing' respiration induced by ethylene, the reduction was less than reported previously for climacteric fruit. These results suggest that stimulation of sweet cherry fruit respiration by ethylene occurs via a process that may be independent of receptors to which 1-MCP binds. Postharvest changes in fruit color and development of stein browning were not altered by 1-MCP treatment, and exogenous ethylene accelerated the development of stein browning regardless of prior treatment with 1-MCP.