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Occurrence and characterization of nitrogen‐fixing Azospirilla in some soils of Egypt
Author(s) -
Nadia F. Emam,
Fayez M.,
Makboul H. E.,
ElShahawy R.
Publication year - 1984
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19841470210
Subject(s) - characterization (materials science) , soil water , nitrogen , nitrogen fixation , environmental chemistry , environmental science , soil science , chemistry , materials science , nanotechnology , organic chemistry
The occurrence and characterization of N 2 ‐fixing azospirilla in some Egyptian soils has been investigated. Seven soils, representing a wide range in texture and properties were selected from different localities in Egypt. The highest nitrogenase activity reported for soil samples under investigation were related to numbers of N 2 ‐fixing microorganisms ( Azotobacter spp., Azospirillum spp. , and Clostridium spp. ). Seven strains of azospirilla were isolated and purified. Based on morphological characteristics, three types of cell morphology were distinguished. Cultural and physiological characteristics as well as nitrogenase activity of representative isolates in presence of different concentrations of NaCl were determined. According to the physiological properties studied, all isolates were classified as members of Azospirillum brasilense .