Inhibition of ethylene responses by 1-Methylcyclopropene and 3-Methylcyclopropene
3-Methylcyclopropene (3-MCP) binds to the ethylene receptor and blocks it for several days, but concentrationswise is less effective than 1-methylcyclopropene (1-MCP). In diverse ethylene-responsive systems, including ripening of mature-green bananas (Musa sapientum L.), inhibition of growth in etiolated pea (Pisum sativum L.) seedlings, abscission of orange (Citrus sinensis L.) leaf explants and mung bean (Vigna radiata L.) leaves, and wilting of campanula (Campanula carpatica) and kalanchoe (Kalanchoë blossfeldiana) florets, full inhibition of the ethylene response required higher concentrations of 3-MCP. Depending on the experimental system, the effective concentration of 3-MCP was from 5 to 10 times higher than that required for 1-MCP.
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