Sensitivity of Potted Foliage Plant Genotypes to Ethylene and 1-Methylcyclopropene

Exposure to 0.1, 1.0, or 10 mu L.L-1 ethylene for 4 days at 21 degrees C reduced the display life of 17 commonly traded potted foliage plant genotypes (Aglaonema 'Mary Ann', Anthurium scherzerianum 'Red Hot' and 'White Gemini', Aphelandra squarrosa Chlorophytum camosum 'Hawaiian', Codiaeum variegatum pictum 'Petra', Dieffenbachia maculata 'Carina', Dracaena marginata 'Bicolor' and 'Magenta', Euphorbia milii 'Gaia', Euphorbia splendens 'Short and Sweet', Ficus benjamina, Polyscias fruticosa 'Castor', Radermachera sinica 'China Doll', Schefflera elegantissimma 'Gemini', Scheiflera arboricola 'Gold Capella', Spathiphyllum 'Ty's Pride'). Ethylene treatment hastened leaf and bract abscission or senescence. The responsiveness of plants to ethylene varied considerably; six genotypes were sensitive to 0.1 mu L.L-1 ethylene, whereas three genotypes required exposure to 10 mu L.L-1 ethylene to trigger visible injury. Four genotypes (Asplenium nidus, Chamaedorea elegans 'Neathe Bella', Hedera helix 'Chicago', Syngonium podophyllum 'White Butterfly') included in our study were insensitive to ethylene. Treating Aglaonema 'Mary Ann', Polyscias fruticosa 'Castor', and Schefflera arboricola 'Gold Capella' plants with 0.9 mu L.L-1 1-methylcyclopropene (1-MCP, provided as EthylBloc (TM)), a gaseous ethylene-binding inhibitor, for 4 to 5 h at 21 degrees C reduced the deleterious effects of ethylene. The release of 1-MCP from two sachets containing EthylBloc (TM) into a single shipping box also protected Aphelandra squarrosa Euphorbia 'Gaia', Polyscias fruticosa 'Elegans', and Schefflera arboricola 'Gold Capella' plants from ethylene injury after simulated transport. Our data reveal the genetic variation in ethylene sensitivity among potted foliage plants and highlight genotypes that benefit from 1-MCP treatment.