摘要
以郑芝4号黑芝麻种子为材料,研究了人工加速老化处理对种子发芽指标、丙二醛(MDA)含量、过氧化物酶(POD)活性和超氧化物歧化酶(SOD)活性的影响。试验结果表明:随着种子老化加深,发芽势、发芽率、发芽指数、活力指数逐渐降低,丙二醛含量逐渐升高。另外,老化种子内POD活性和SOD活性变化的总趋势是随老化时间延长而降低。由此认为芝麻种子人工老化及劣变的主要机制与抗氧化酶活性降低和膜脂过氧化作用加剧有关。人工老化种子生活力出现快速下降的发芽势拐点是80%,其下降的趋势又与POD活性下降非常一致,POD可作为一个检测指标显示种子活力高低及丧失的特征。
The germination index, malondialdehyde （MDA） content, and the activity of peroxidase （POD） and superoxide dismutase （SOD） were studied with black sesame（ zhengzhi. 4）seeds treated with high artificial aging. The results showed that germination potential, germination rate, germination index and vigor index were reduced gradually and the MDA content was raised with the aging seeds. The activity of POD and SOD decreased in aged seeds with extended treating time. The main mechanism for deterioration of sesame seeds during artificial aging was closely related to an increase of lipid peroxidation and a decrease in activity of antioxidant enzymes. The threshold for sesame seed viability was 80% artificial aging sesame seed germination potential whose decreasing tendency was consistent with POD activity, so POD activity may be an index to indicate the characteristic of height and loses of vigor in the seeds.
出处
《中国油料作物学报》
CAS
CSCD
北大核心
2008年第4期460-463,共4页
Chinese Journal of Oil Crop Sciences
基金
国家科技支撑计划(2006BAD13B10)
关键词
芝麻种子
人工老化
生理生化特性
Sesame seed
Artificial aging
Physiological and biochemical characteristics
