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盐胁迫下大麦幼苗多胺的种类和状态与多胺氧化酶活性的关系
引用本文:刘俊,刘友良.盐胁迫下大麦幼苗多胺的种类和状态与多胺氧化酶活性的关系[J].植物生理与分子生物学学报,2004,30(2):141-146.
作者姓名:刘俊  刘友良
作者单位:南京农业大学生命科学学院,南京,210095
基金项目:高等学校博士学科点专项科研项目
摘    要:200 mmol/L的NaCl胁迫8 d大麦幼苗叶片和根系中的三种形态多胺都有不同程度地下降,其中游离态多胺含量的下降幅度最大;高氯酸不溶性结合态多胺含量变化较小.根系中PAO的活性先上升后下降,而叶片中PAO的活性先下降后上升.游离态多胺中,亚精胺和精胺(Spd Spm)的含量变化与相应部位PAO的活性变化趋势相反,表明PAO在盐胁迫下可能调节了游离态多胺的含量从而影响高氯酸可溶结合态与高氯酸不溶结合态多胺的含量.

关 键 词:大麦  盐胁迫  多胺  多胺氧化酶
修稿时间:2003年8月21日

The Relations Between Polyamine Types and Forms and Polyamine Oxidase Activities in Barley Seedlings Under Salt Stress
LIU Jun,LIU You-Liang.The Relations Between Polyamine Types and Forms and Polyamine Oxidase Activities in Barley Seedlings Under Salt Stress[J].Journal Of Plant Physiology and Molecular Biology,2004,30(2):141-146.
Authors:LIU Jun  LIU You-Liang
Institution:College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China.
Abstract:The three polyamines (Put, Spd and Spm) and their different forms (free, perchioric acid soluble and insoluble conjugated) together with polyamine oxidase (PAO) activities were measured in barley (Hordeum vulgare L. KP7) seedlings under salt stress. The results showed that the free polyamines were dominant forms among three polyamines, account about 2/3 total polyamines (Fig.l). All three polyamines decreased in roots and leaves after 8 d under NaCl 200 mmol/L stress. The free polyamine content decreased dramatically as well as soluble conjugated polyamine content, while the insoluble ones changed little. Different concentration salt stress increased markedly the ratios of (Spd Spm)/Put and decreased significantly the total polyamine content in roots and leaves (Table 1). PAO activities in roots was increased at first and then decreased under NaCl stress, while in leaves the activities changed in opposite direction (Fig.4). It has been noted that the sum of free Spd and Spm (Spd Spm) content is reversely correlated with PAO activity changes (Fig.2), which suggests that PAO might regulate the free polyamine content, therefore, the contents of the soluble and insoluble conjugated polyamines were affected.
Keywords:barley  salt stress  polyamines  PAO
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