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应用生态学报 ›› 1997, Vol. 8 ›› Issue (5): 519-526.

• 研究论文 • 上一篇    下一篇

基模势对luxAB标记的快生型大豆根瘤菌在土壤中存活的影响

崔明学, 张成刚, 靳素英, 李明祺   

  1. 中国科学院沈阳应用生态研究所,沈阳 110015
  • 收稿日期:1997-07-14 修回日期:1997-08-27 出版日期:1997-09-25 发布日期:1997-09-25
  • 基金资助:

    国家自然科学基金(39570027);中国科学院陆地生态系统痕量物质生态过程开放实验室基金

Effect of matric potential on the survival of luxAB marked Rhizobium fredii in soil

Cui Mingxue, Zhang Chenggang, Jin Suying, Li Mingqi   

  1. Institute of Applied Ecology, Academia Sinica, Shenyang 110015
  • Received:1997-07-14 Revised:1997-08-27 Online:1997-09-25 Published:1997-09-25

摘要: 经接合转移将luxAB基因插入快生型大豆根瘤菌(Rhizobium fredii)染色体,取可高效结瘤固氮的R.fredii lux3 菌株用于分子生态学研究.在不同基模势下,研究了lux3 在土壤中的存活,基模势为-30和-750kPa时,lux3 在灭菌土中的生存能力明显(P<0.05)高于未灭菌土,当基模势为-1500kPa时,土壤是否灭菌对lux3 的存活影响没有差异.不同基模势对lux3 活性影响显著,在-1500kPa的未灭菌土中,随着饥饿时间延长,可恢复活性的细菌数量显著下降.同时比较了测定微生物活性的3种方法(即生物发光、脱氢酶活性和微生物呼吸),发光值变化与活细胞密度变化一致,PLf值(即潜在发光,Potential luminescence)反映了可恢复活性的饥饿种群密度.luxAB基因是一种比较简便而实用的标记.

关键词: 快生型大豆根瘤菌, 基模势, 存活, luxAB基因, 低影响开发, 沈阳, 海绵城市, 暴雨径流管理模型(SWMM)

Abstract: The luxAB gene were inserted into the chromosome of Rhizobium fredii by conjugation.R.fredii lux3 which could nodulate soybean and fix nitrogen efficiently was used in studying on molecular ecology of R. fredii. The survival and activity of R.fredii lux3 were studied following inoculation into soil microcosms at different matric potentials.Survival were significantly (P<0.05) greater in sterile soil at -30 and -750 kPa than that in nonsterile soil.Survival at -1500 kPa was not affected by autoclaving of soil.The activity of R. fredii lux3 in soil were influenced significantly by different matric potentials.Reactivation decreased greately with prolonged starvation.Population activity was measured by liquid scillination, dehydrogenase activity and respiration.Metabolic activity measured by luminescence decreased significantly with time (P<0.05).Luminescence following amendment with substrates ( potential luminescence,PLf) demonstrated the time required for activation of the starved inoculum.Therefore,luxABgene was a convenient and useful marker for R.fredii.

Key words: Rhizobium fredii, Matric potential, Survival, luxAB gene, Shenyang, storm water management model (SWMM), low impact development, sponge city