【摘要】 以大葱种子为材料,通过定期测定人工老化(45℃、100%RH)和自然老化(室温贮藏)各项活力和生理生化特性的变化,研究大葱种子衰老过程中的活力变化规律及两种研究方式的差异。结果表明,经人工老化处理的大葱种子,其发芽率、发芽势、发芽指数、活力指数和CAT活性随老化时间的延长而逐渐下降,POD活性随老化时间先下降后上升,种子活力在老化初期下降较快,后期下降较慢,而SOD活性和自由基含量变化不明显。自然老化状态下大葱种子的发芽率、发芽势、发芽指数、活力指数、CAT和POD活性均随自然贮藏时间下降显著,说明种子的活力丧失明显。在发芽率变化一致的情况下,自然老化大葱种子发芽势、发芽指数、CAT活性、POD活性下降明显快于人工老化的种子,人工老化与自然老化的老化规律不完全一致,不能完全替代自然老化。更多还原

【Abstract】 In this paper, the vigor, physiological and biochemical characteristics of welsh onion seeds were measured regularly by artificial aging(45 ℃,100% RH) and natural aging(room temperature storage),and studied the change rule of vigor in both two aging process of welsh onion seeds and compared the difference between the two methods.The results showed that the germination rate, germination potential, germination index, vigor index and CAT activity of the artificial aging seeds decreased gradually with the extension of aging time, while the POD activity first decreased and then increased with the extension of aging time.The seed vigor decreased faster in the early aging stage and slower in the later aging stage, but SOD activity and free radical content did not change significantly.The germination rate, germination potential, germination index, vigor index, CAT and POD activities of welsh onion seeds under natural aging condition decreased significantly with natural storage time, indicating that the vigor of seeds was obviously lost.Under the same change of germination rate, the germination potential, germination index, CAT activity and POD activity of naturally aged welsh onion seeds decreased significantly faster than that of artificially aged seeds.The aging law of artificial aging was not completely consistent with that of natural aging, so it could not completely replace the natural aging.更多还原