目的以PEG6000溶液处理望江南种子,研究PEG对望江南种子萌发的影响。方法分别用5%和10%PGE6000处理望江南种子,对种子发芽率、超氧化物歧化酶(SOD)、过氧化物酶(POD)活性和脂质过氧化产物丙二醛(MDA)的量进行测定。结果与同期对照相比,5%PEG6000浸种5h,提高SOD活性和POD活性,降低脂质过氧化产物MDA的量,减少自由基积累,减轻浸种吸胀对膜系统的损伤。结论5%PEG浸种5h提高望江南种子的发芽率。

Objective To simulate the solution drought stress conditions with polyethylene glycol (PEG) 6000 for study on the seed germination of Cassia occidentalis.Methods The seed of C.occidentalis was treated with 5% and 10% PEG 6000,respectively,then the germination rate,the activity of superoxide dismutase (SOD),peroxidase (POD),and content of malondialdehyde (MDA) were measured.Results Compared with the same period of the control,soaking with 5% PEG 6000 for 5 h could increase the activity of SOD and POD,decrease the content of MDA.PEG Pretreatment could decrease free radical accumulation and make cell membrane system less damaged in the course of absorbing water in seed.Conclusion Soaking with 5% PEG 6000 for 5 h could increase the seed germination rate of C.occidentalis.

国家自然科学基金资助项目(30040027);安徽省星火计划资助项目(04053051)