华北农学报 ›› 2007, Vol. 22 ›› Issue (1): 172-177. doi: 10.3321/j.issn:1000-7091.2007.01.041

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羊草根际固氮菌的分离及其生长条件的研究

郑红丽1, 庞保平1, 樊明寿1, 刘双平2   

  1. 1. 内蒙古农业大学农学院, 内蒙古 呼和浩特 010019;
    2. 内蒙古巴彦淖尔市植保植检站, 内蒙古 临河 015000
  • 收稿日期:2006-04-26 出版日期:2007-02-28
  • 通讯作者: 樊明寿(1965-),男,内蒙古四子王旗人,教授,主要从事植物营养和植物生理研究工作。
  • 作者简介:郑红丽(1966-)女,内蒙古土默特左旗人,副教授,在读博士研究生,主要从事农业微生物研究。
  • 基金资助:
    国家自然科学基金(30560031);内蒙古自然科学基金资助项目(200208020302)

Isolation of Nitrogen Fixing Bacteria from Rhizosphere of Leymus chinensis and Investigation on their Growth Conditions

ZHENG Hong-li1, PANG Bao-ping1, FAN Ming-shou1, LIU Shuang-ping2   

  1. 1. College of Agronomy, Inner Mongolia Agricultural University, Huhhot 010019, China;
    2. Bayan NaoEr Plant Protection Station, Linhe 015000, China
  • Received:2006-04-26 Published:2007-02-28

摘要: 为了获得禾本科牧草羊草根际土壤固氮菌分布的基本情况及优势菌株,于羊草生长旺盛季节,在内蒙古锡林郭勒天然草地的羊草根际土壤、原土体以及羊草根内进行了固氮细菌的分离,并统计了数量分布。通过分离和筛选共获得14个固氮菌株,这些固氮菌的分布表现为离根系越近,土壤中固氮菌的数量越多。从14个固氮菌株中筛选出4个固氮能力相对较强的菌株,对其进行了形态观察以及碳源、pH值、温度等生长条件的研究,结果表明,在供试的碳源中,4个菌株能很好地利用蔗糖和葡萄糖,但不能利用纤维素;适宜生长的pH范围为7~8;适宜生长的温度范围为25~35℃,其中分离自原土体土壤的2个菌株耐受温度变化的能力相对较强。

关键词: 固氮细菌, 分离, 形态学特征, 生长条件

Abstract: In order to get basic knowledge about abundance and distribution of N fixing bacteria in rhizosphere of Leymus chinensis in grassland, isolation of N fixing bacteria was conducted in midseason of Leymus chinensis growth in Xilinguole grassland of Inner Mongolia by culturing hydraulic extraction of soil and root samples in Doberiner's cultural media. The results showed that 14 strains of N fixing bacteria exist in the bulk soil, rhizosphere and roots of Leymus chinensis plants. Number of the N fixing bacteria in soil decreases gradually apart from Leymus chinensis plant roots. 4 strains of nitrogen-fixing bacteria with greater N fixing capacity from 14 strains, Yc1 and Yc2 isolated from roots and Tr1 and Tr11 isolated from soil, were selected by comparing their nitrogenase activities for morphological observation and investigation of their growth condition. The results about growth condition of 4 strains of bacteria showed that they all can use sucrose and glucose very well, while they can not use cellulose at all. The best temperature for the 4 strains of bacteria growth is 25-35℃, and the two strains isolated from soil are more tolerant to both low temperature and high temperature than the ones from plant roots. Suitable pH is 7-8 for growth of the strains of N fixing bacteria.

Key words: Nitrogen-fixing bacteria, Isolation, Morphological characteristics, Growth condition

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引用本文

郑红丽, 庞保平, 樊明寿, 刘双平. 羊草根际固氮菌的分离及其生长条件的研究[J]. 华北农学报, 2007, 22(1): 172-177. doi: 10.3321/j.issn:1000-7091.2007.01.041.

ZHENG Hong-li, PANG Bao-ping, FAN Ming-shou, LIU Shuang-ping. Isolation of Nitrogen Fixing Bacteria from Rhizosphere of Leymus chinensis and Investigation on their Growth Conditions[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2007, 22(1): 172-177. doi: 10.3321/j.issn:1000-7091.2007.01.041.

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