Abstract. Ethylene effects were investigated on two tulip (Tulipa gesneriana L.) cultivars,
Markant and Carreria. Pre-cooled bulbs were treated with ethylene (flow-through) for 1
week at 0, 0.1, 1.0, or 10 mLL–1 (± 10%) in a modified hydroponic system. After ethylene
exposure, plants were either destructively harvested for root measurements or forced
in a greenhouse for flower measurements. Ethylene exposure at concentrations as low as
1mLL–1 during the firstweek of growth reduced shoot and root elongation and subsequently
increased flower bud abortion. At 10 mLL–1, root growth was essentially eliminated. In
a second experiment, bulbs were treated overnight with 1-methylcyclopropene (1-MCP)
before a 7-day exposure to 1 mLL–1 ethylene. 1-MCP pretreatment eliminated the harmful
effects of ethylene on root and shoot growth. This study illustrates the effects of ethylene
exposure during hydroponic tulip production and demonstrates a potential benefit to
treating bulbs with 1-MCP before planting.
Abstract. Ethylene effects were investigated on two tulip (Tulipa gesneriana L.) cultivars,Markant and Carreria. Pre-cooled bulbs were treated with ethylene (flow-through) for 1week at 0, 0.1, 1.0, or 10 mLL–1 (± 10%) in a modified hydroponic system. After ethyleneexposure, plants were either destructively harvested for root measurements or forcedin a greenhouse for flower measurements. Ethylene exposure at concentrations as low as1mLL–1 during the firstweek of growth reduced shoot and root elongation and subsequentlyincreased flower bud abortion. At 10 mLL–1, root growth was essentially eliminated. Ina second experiment, bulbs were treated overnight with 1-methylcyclopropene (1-MCP)before a 7-day exposure to 1 mLL–1 ethylene. 1-MCP pretreatment eliminated the harmfuleffects of ethylene on root and shoot growth. This study illustrates the effects of ethyleneexposure during hydroponic tulip production and demonstrates a potential benefit totreating bulbs with 1-MCP before planting.
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