Abstract: The effects of different concentrations of cerium nitrate on Arachis hypogaea seedling growth, flowering number and antioxidant enzymes peroxidase (POD), superoxide dismutase (SOD) activity and malondialdehyde (MDA) content were investigated by solution culture. The results showed that Cerium concentration below 20.0?mg·L–1 could promote the growth and flowering of peanut seedlings. Among the Ce concentrations tested, the best growth was obtained at 10.0 mg·L–1 cerium, where its biomass and flowering number were about 1.3 and 2.8?times that of the control. But Cerium concentration higher than 20.0 mg·L–1 inhibited the growth and reduced the number of flower buds. Cerium concentration lower than 20.0 mg·L–1 inhibited POD activity and reduced the content of malondialdehyde (MDA) in peanut seedlings, and the lowest POD activity and MDA content, which was about 47.51% and 20.76% of the control, were seen when addition of 10.0 mg·L–1 cerium into the culture solution. It was also found that less than 20.0 mg·L–1 cerium enhanced SOD activity in peanut seedlings, the highest SOD activity, which was about 2.0 times that of the control, was obtained at 5.0 mg·L–1 cerium in the culture solution.

Key words: Arachis hypogaea, cerium, growth, SOD, POD, MDA

摘要： 采用溶液培养方法，研究不同浓度硝酸铈对花生(Arachis hypogaea)幼苗生长、开花数目及抗氧化酶过氧化物酶(POD)、超氧化物歧化酶(SOD)活性与丙二醛(MDA)含量的影响。结果表明，与对照相比，铈浓度低于20.0 mg·L–1能促进花生幼苗生长及开花，其中以10.0 mg·L–1铈的效果最为明显，其生物量和开花数分别约为对照的1.3倍和2.8倍；但高于20.0 mg·L–1则抑制花生幼苗生长，降低花朵数目；同时，低于20.0 mg/L铈可抑制花生幼苗过氧化物酶(POD)活性和降低其丙二醛(MDA)含量，其中以10.0 mg·L–1铈的抑制效果最明显，其POD活性和MDA含量约为对照的47.51%和20.76%；而低于20.0 mg·L–1铈能提高花生幼苗的超氧化物歧化酶(SOD)活性，其中以5.0 mg·L–1铈的促进效果最明显，其SOD活性约为对照的2.0倍。

关键词: 花生, 铈, 生长, SOD, POD, MDA