当前位置: 首页 > 文章 > 玉米根际高效固氮菌Sphingomonas sp. GD542的分离鉴定及接种效果初步研究 中国生态农业学报 2010,18 (1) 89-93
Position: Home > Articles > Isolation,identification and inoculation effect of nitrogen-fixing bacteria Sphingomonas GD542 from maize rhizosphere Chinese Journal of Eco-Agriculture 2010,18 (1) 89-93

玉米根际高效固氮菌Sphingomonas sp. GD542的分离鉴定及接种效果初步研究

作  者:
孙建光;张燕春;徐晶;胡海燕
单  位:
农业部作物营养与施肥重点实验室中国农业科学院农业资源与农业区划研究所
关键词:
玉米根际;固氮菌;分离鉴定;鞘氨醇单孢菌GD542
摘  要:
固氮微生物菌种选育是固氮微生物肥料生产应用的基础。本研究从玉米根际土壤分离到1株高效固氮菌株GD542,菌体短杆状,0.4μm×1.0~1.5μm,革兰氏阴性;固氮酶活性为5.046nmol(C2H4)·h-1·mg-1(蛋白);利用碳源较广泛,抗逆性较强,既可在4℃低温生长,也可以在37℃下生长,耐盐性高达10%。16SrDNA序列分析结果表明,该菌株与鞘氨醇单孢菌Sphingomonas azotifigens的16SrDNA序列有高达96%的同源性,结合形态特征和生理生化特征等,将其初步鉴定为鞘氨醇单孢菌Sphingomonas sp.。接种小白菜的温室盆栽试验表明,菌株GD542具有很好的固氮效能,与无氮对照相比,接种GD542处理植株干重增加206%,含氮量增加230%,达到统计学显著差异水平,开发应用前景较好。
译  名:
Isolation,identification and inoculation effect of nitrogen-fixing bacteria Sphingomonas GD542 from maize rhizosphere
作  者:
SUN Jian-Guang,ZHANG Yan-Chun,XU Jing,HU Hai-Yan (Key Laboratory of Crop Nutrition and Fertilization,Ministry of Agriculture;Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences,Beijing 100081,China)
关键词:
Maize rhizosphere,Nitrogen-fixing bacteria,Bacteria isolation and identification,Sphingomonas GD542
摘  要:
Breeding of nitrogen-fixing bacteria is the basis for nitrogen-fixing microbial fertilization.A high efficiency nitrogen-fixing bacteria Sphingomonas GD542 was isolated from maize rhizosphere—a short rod of 0.4 μm×1.0~1.5 μm,G-,with 5.046 nmol (C 2 H 4)·h-1 ·mg-1 (protein) nitrogenase activity,that can grow from 4 ℃ to 37 ℃ and resistant to 10% NaCl.Phylogeny based on 16 S rDNA sequence shows that GD542 shares 96% DNA homology with S.azotifigens.Based on the analysis results of morphology,physiology,chemical property,and 16 S rDNA sequencing,strain GD542 is identified as Sphingomonas sp.Green house test shows a statistically significant increase in dry weight and nitrogen content in pakchoi inoculated with GD542 strain,indicating high nitrogen fixing ability of GD542 strain.There is 206% increase in dry weight and 230% increase in plant nitrogen content of pakochoi compared with the control.Hence GD542 strain holds a good prospect for future applications.

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