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5～50kradγ射线明显抑制马铃薯块茎出芽,10krad以上剂量可使马铃薯在常温下保藏210天以上。 马铃薯块茎在辐照后2.5小时内即可测出γ射线诱导释放累积的乙烯,乙烯释放量随剂量加大而增加,照后7小时达最大量,随后下降,到48小时消失。应用乙烯生物合成前体Met、ACC及抑制剂AOA的实验证明马铃薯块茎乙烯的产生是走蛋氨酸途径,γ射线对此起激活作用。 1000ppm乙烯处理引起与γ射线相似的对马铃薯块茎呼吸的刺激作用和抑芽效应,推论γ射线刺激产生的乙烯是γ射线抑制马铃薯块茎出芽的原初反应。
The 5-50 krad γ-ray significantly inhibited the sprouting of potato tubers, and 10 krad or more doses could preserve the potato at room temperature for more than 210 days. The y-ray-induced release of ethylene was measured within 2.5 hours after irradiation in potato tubers. Ethylene production increased with increasing doses, reached maximum levels 7 hours after exposure, then decreased, and disappeared within 48 hours. Experiments using the ethylene biosynthetic precursors Met, ACC and inhibitor AOA demonstrated that the production of ethylene in potato tubers takes the methionine pathway and γ-rays play an activating role. Ethylene treatment at 1000 ppm caused stimulating and sprouting effects on potato tuber respiration similar to that of gamma rays. It was concluded that ethylene produced by gamma-ray stimulation is the primary response to gamma-ray inhibition of potato tuber sprouting.