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为探讨多胺提高水稻的抗性机理,研究渗透胁迫下外源腐胺(Put)和鸟嘌呤腙(MGBG)对水稻幼苗多胺与抗氧化系统的影响.结果表明:渗透胁迫下‘,湘早籼32号’丙二醛(MDA),过氧化氢(H2O)2含量明显上升‘,嘉早935’腐胺(Put)、亚精胺(Spd)、精胺(Spm)含量及超氧化物歧化酶(SOD)、过氧化物酶(POD)活性及维生素C(Vc)含量上升明显;外源Put处理,明显提高‘嘉早935’Put,Spd和Spm含量及SOD,POD活性及Vc含量;外源MGBG处理,明显抑制‘湘早籼32号’SOD,POD活性和Vc,Spd和Spm含量的上升,且明显促进MDA和H2O2含量的增加.通过相关性分析得出:Put,Spd,Spm与SOD,POD及Vc呈正相关,而SOD,POD,Vc与H2O2呈负相关.
In order to explore the mechanism of polyamine increase resistance in rice, the effects of exogenous putrescine (PG) and guanosine hydrazone (MGBG) on polyamines and antioxidant systems in rice seedlings under osmotic stress were studied. The results showed that under osmotic stress, The content of malondialdehyde (MDA) and hydrogen peroxide (H 2 O 2) in early indica rice 32 was significantly increased, the contents of Put, 9d, Spm and superoxide The activities of SOD, POD and Vc increased significantly. Exogenous Put increased the content of P, Spd and Spm, the activity of SOD and POD and the activity of Vc Content of exogenous MGBG significantly inhibited the activities of SOD and POD and the contents of Vc, Spd and Spm in Xiangzaoxian 32 and significantly increased the content of MDA and H2O2.The correlation analysis showed that Put and Spd , Spm was positively correlated with SOD, POD and Vc, while SOD, POD and Vc were negatively correlated with H2O2.