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台湾相思结瘤固氮与吸氢酶活性研究 被引量:10

Symbiotic Nitrogen-fixing and Uptake Hydrogenase Activity in Acacia confusa
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摘要 台湾相思的根系具有多年生的根瘤,根瘤初发生时球状,以后发育成分叉瘤和扇状瘤。根瘤固氮活性因苗龄、成熟度不同而有明显差异。环境条件影响结瘤及固氮活性。15℃时结瘤受到明显抑制,固氮作用最适温度条件是25~30℃。光照不足降低根瘤固氮活性。短期轻度干旱不影响根瘤固氮活性,但持续干旱使固氮活性明显下降。pH4.5~8.5条件能正常结瘤,pH5.5时结瘤最好。根瘤固氮作用时不释放H_2,具有较高的吸氢酶活性,在固氮反应系统中加入5%的H_2,能提高根瘤固氮活性。 Acacia confusa is an important fuelwood tree in South China. Their root systems bear perennial nodules. The nodules change considerably in external shape as their growth, from single sphere to branchy or multibranchy. The level of nitrogenase activity, as determined by acetylene reduction assay, markedly varied with the age and physiological stages of nodules. Effect of environmental factors on nodulation and nitrogen fixation of A. confusa was investigated. The optimum temperature for nitrogenase activity of nodules ranged 25-30C , low temperature of 15 C seriously retarded nodulation. Shading reduced nitrogenase activity of nodules. Minor soil water deficit did not affect the acetylene-reducing activity, but serious soil drought markedly reduced the activity of nitrogen fixation. In nitrogen-free culture solution with a pH between 4. 5 and 8.5, roots of seedling normally nodulated and at pH 5. 5,thenumber of nodules per plant was the most. Expression of uptake hydrogenase activity was found in nodules of A. confusa. When adding 5% molecular hydrogen to reaction system, nitrogenase activity in nodules increased markedly.
出处 《亚热带植物通讯》 1993年第1期1-6,共6页
基金 国家自然科学基金资助课题
关键词 台湾相思 固氮酶 结瘤 氢酶 Acacia confusa , Nitrogenase activity, Nodulation , Hydrogenase activity
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参考文献5

  • 1黄维南,蔡克强,邹小鲁.大叶相思的结瘤固氮和吸氢酶活性[J].亚热带植物通讯,1990,19(1):1-6. 被引量:9
  • 2黄维南,黄岩,吴以德,蔡克强.银合欢根瘤发育和固氮功能的关系[J]福建省农科院学报,1987(02).
  • 3蔡克强,黄维南.不同氮水平和氢离子浓度对银合欢幼苗结瘤固氮的影响[J]亚热带植物通讯,1987(02).
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二级参考文献6

  • 1黄维南,蔡克强,蔡龙祥,吴以德,徐志伟,蓝谷.气候因子对银合欢共生固氮的影响[J]亚热带植物通讯,1988(02).
  • 2黄维南,黄岩,吴以德,蔡克强.银合欢根瘤发育和固氮功能的关系[J]福建省农科院学报,1987(02).
  • 3黄维南,蔡克强,吕荣欣,吴以德,蔡龙祥.柑桔园的间作绿肥—印度豇豆根瘤的固氮活性及固氮量评价[J]福建农学院学报,1983(04).
  • 4R. O. D. Dixon. Hydrogenase in legume root nodule bacteroids: Occurrence and properties[J] 1972,Archiv für Mikrobiologie(3):193~201
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  • 6黄绳全,黄维南.大叶相思引种栽培初步研究[J].亚热带植物科学,1989(2):21-26. 被引量:4

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