摘要： 在室内水培条件下，研究了不同质量浓度的纳米碳点对花生幼苗生长及相关生理生化指标的影响。结果表明，不同质量浓度的纳米碳点处理对花生种子萌发、幼苗生长、根系活力和抗氧化酶活性等均有不同程度的促进作用，且随着纳米碳点质量浓度的升高，花生种子的发芽势、发芽率、主根长、苗高、根干质量、地上部干质量、根系活力及幼苗的超氧化物歧化酶（SOD）、过氧化物酶（POD）、过氧化氢酶（CAT）活性均表现出先升高后降低的趋势；此外，不同质量浓度的纳米碳点处理可降低花生幼苗中丙二醛（MDA）的含量，增加花生幼苗可溶性糖的含量。在各处理中，以纳米碳点质量浓度为180 mg/L时使用效果最佳，与CK相比，该处理花生幼苗的主根长、苗高、根干质量、地上部干质量、根鲜质量、地上部鲜质量、SOD活性、CAT活性分别比CK增加了36.84%，46.24%，31.03%，47.03%，55.93%，42.22%，22.73%，36.81%，而根系活力则提高了4.5倍。研究表明，适宜质量浓度的纳米碳点可以调节花生幼苗生理生化过程，促进幼苗的生长。

关键词: 纳米碳点, 花生, 幼苗生长, 根系活力, 抗氧化酶活性

Abstract: The effects of carbon nanodots with different concentrations on the seedling growth and related physiological and biochemical indexes of peanut were studied under the condition of indoor hydroponics. The results showed that the treatment of carbon nanodots had different promotion effects on seed germination, seedling growth, root activity and antioxidant enzyme activity. The germination potential, germination rate, main root length, seeding height, root dry mass, aboveground dry mass, root vigor, and the enzyme activities of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) of seedlings all showed the same trend of increasing first and then decreasing along with the increase of carbon nanodots concentration. In addition, carbon nanodots reduced the content of malondialdehyde (MDA), and increased the content of soluble sugar in peanut seedlings. Compared with the control, the treatment with 180 mg/L carbon nanodots had the best effect, in which the main root length, seeding height, root dry mass, aboveground dry mass, root fresh weight, aboveground fresh weight, SOD activity, CAT activity and root vigor increased by 36.84%, 46.24%, 31.03%, 47.03%, 55.93%, 42.22%, 27.73%, 36.81% and 4.5 times, respectively. The results indicated that suitable concentration of carbon nanodots could promote the seedling growth of peanut by regulating the physiological and biochemical behaviors.

Key words: Carbon nanodots, Peanut, Seedling growth, Root activity, Antioxidant enzyme activity

中图分类号: 

• S565.01