不同贮藏条件下豆薯种子的脂质过氧化研究

Changes in Lipid Peroxidation in Yambean Seeds Stored under Different Conditions

摘要:

豆薯(Pachyrhizuserosus(L.)Urban)种子分别在4℃、15℃相对湿度(RH)45%及室温开放条件下贮藏,或新鲜种子进行超干处理将其含水量降到6.43%后密封贮存,以探讨种子劣变的生理机制。结果表明,豆薯种子在室温开放贮藏12个月的发芽率降至50%,24个月后发芽力完全丧失。4℃下贮藏豆薯种子最有效,贮藏后种子的电导率和紫外吸收值较低,过氧化氢酶、过氧化物酶和超氧化物歧化酶活性仍保持较高水平,种子萌发时释放出的挥发性醛也较低。适当的超干处理效果与15℃ 45%RH相似,但不及4℃的。

Abstract:

Yambean (Pachyrhizus erosus (L.) Urban) seeds were stored in drier in refrigerator at 4℃, in sealed drier containing saturated solution of potassium sulfocyanate at 15℃ and at 45% relative humidity, in room temperature, and in ambient temperature after the seeds were dried at 6.43% seed moisture (ultra-dry treatment). The experiments showed that the germination rate of yambean seeds declined to 50% in room temperature after 12 months of storage, and completely lost the germination capacity after 24 months.