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美国植物生理学家伍德斯托克发现,用冻干法处理后的洋葱籽,保存两年后仍然发芽。以后,这位科学家将洋葱、胡椒、香芹种子在40~50℃的相当于熟带或亚热带的气温下,用冻干法保存七年之久,这些种子也未坏死。他认为采用冻干和风干相结合效果更佳。即先用风干可使种子失水10%,然后再用冻干法使之失水5%。经过这两步方法处理后的种子包装密封在室温可贮藏多年。
Woodstock, an American plant physiologist, found that onion seeds treated with lyophilization still germinate after two years of storage. Later, the scientists preserved the seeds of onions, peppers and parsley for 40 years in the warmer or subtropical zone at temperatures of 40 to 50 ° C for seven years without necrosis. He thinks the combination of freeze-drying and air-drying works better. The first use of air-dried seeds can be dehydrated 10%, then freeze-dried to make it 5% water loss. Seeds sealed by the two-step process can be stored for many years at room temperature.