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Phenotypic characteristics of rhizobia isolates nodulating Acacia species in the arid and Saharan regions of Morocco
Author(s) -
Zerhari K.,
Aurag J.,
Khbaya B.,
Kharchaf D.,
FilaliMaltouf A.
Publication year - 2000
Publication title -
letters in applied microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.698
H-Index - 110
eISSN - 1472-765X
pISSN - 0266-8254
DOI - 10.1046/j.1472-765x.2000.00730.x
Subject(s) - rhizobia , arid , acacia , biology , phenotype , rhizobiaceae , botany , nitrogen fixation , symbiosis , bacteria , ecology , genetics , gene
The phenotypic characteristics of 48 isolates obtained from root nodules of four Acacia species ( Acacia cyanophylla, A. gummifera, A. horrida and A. raddiana ) growing in soils collected from the arid and Saharan regions of Morocco were studied. The rhizobia were very diverse with respect to their cross‐nodulation patterns, as well as their physiological and biochemical properties. Dendrograms obtained through computer numerical analysis of 52 phenotypic characteristics showed that isolates could fit into four clusters below the boundary level of 0·85 average distance and that they were very distinct from the reference strains. Some interesting isolates for inoculation trials have been identified. They were able to grow at pH ranging from 4 to 9, tolerate a high salt concentration (3% NaCl) and grew at a maximum temperature between 35 and 40 °C.