【摘要】 研究了洋葱种子含水量降至 5%以下对其抗老化能力的影响及其与自由基清除能力的关系 .结果表明 :(1)在一定的含水量范围内 ,降低种子含水量对种子的发芽率和活力无影响 ,且能显著地提高种子的抗老化能力 ,其最适含水量为 3%左右 ;(2 )在同等老化条件 (50℃ ,4 5d)下 ,超干种子仍保持较高的自由基清除系统的酶活性 (SOD、CAT) ,而对照种子的酶活性明显下降更多还原

【Abstract】 The effects of aging resistance and free radical scavenging were studied in onion seeds dried to water contents between 1 21% and 7 08% The results showed that: (1) Ultra dried seeds within certain MC limit showed no adverse effect on seed vigor Furthermore, ultra dried seeds significantly enhanced aging resistant capability under aging accelerating condition (50 ℃,45days) The critical MC for onion seeds was about 3% (2) During ultra drying of onion seeds, the level of free radicals increased, but decreased as pre humidification before imbibition, which had a scavenging action on free radicals (3) Activities of the antioxidant enzymes, catalase and superoxide dismutase were reserved during storage in an ultra dry state更多还原