Evaluation of symbiotic effectiveness of various Rhizobium cicer strains

Five local and seven standard strains of Rhizobium cicer were compared in terms of their efficiency in increasing the nitrogen content of the chickpea. Shoot dry weight, nodule number, nodule dry weight, protein and total nitrogen contents were taken as the parameters of plant productivity. Different combinations of the strains that were found to be promising (385, 620, Y-29 and 3379) were next employed. The maximum increase in total nitrogen content was only 3.5-fold in single infection whereas an increase as great as 35-fold was recorded for multiple infections. The double infection with Y-29 and 385 as well as the triple infection with Y-29, 620 and 3379 gave rise to the maximum values. Competitiveness of the strains in mixed infections was determined through their recovery from root surfaces and nodules and their subsequent identification. The: effects of soil pH and of varying the concentration of some minerals on the outcome of symbiosis were also reported. (C) 2002 Editions scientifiques et medicales Elsevier SAS. All rights reserved.


Identification of population dynamics in sulfate-reducing consortia on exposure to sulfate
İçgen, Bülent (Elsevier BV, 2006-12-01)
The microbial population structure and function of a mixed culture of sulfate-reducing bacteria (SRB) maintained in anaerobic continuous bioreactors were tracked before and after a major perturbation, which involved the addition of sulfate to the influent of a bioreactor when operated at steady state at 35 degrees C, pH 7.8 and a 2.5 day residence time with feed stream containing 10 and 15 kg m(-3) sulfate as terminal electron acceptor and 19.6 and 29.4 kg m(-3) 4 ethanol as carbon source and electron donor...
Exposure to sulfide causes populations shifts in sulfate-reducing consortia
İçgen, Bülent (Elsevier BV, 2006-10-01)
The shift in the community structure of a mixed culture of sulfate-reducing bacteria (SRB) at 0.5, 0.75, 1, and 1.5 kg m(-3) sulfide loadings was investigated in an anaerobic continuous bioreactor used for treatment of sulfate-containing wastewater by fluorescence in situ hybridization (FISH), using SRB species-specific and group-specific 16S rRNA-targeting probes. Hybridization analysis using these 16S rRNA-targeted oligonucleotide probes revealed that sulfide was toxic for Desulfonema, Desulfobulbus spp. ...
Regulation of crystal protein biosynthesis by Bacillus thuringiensis: II. Effects of carbon and nitrogen sources.
Içgen, Y; İçgen, Bülent; Özcengiz, Gülay (Elsevier BV, 2002-11-01)
The regulation of crystal protein production in Bacillus thuringiensis 81 by sources of carbon and nitrogen was investigated. The highest titers of toxin were obtained on sucrose, lactose and inulin which also supported sporulation. Whey and molasses were also potential carbon substrates for toxin production. Other carbohydrates including glucose, glycerol, maltose, starch and dextrin yielded lower amounts of toxin. Nitrogen sources were found to exert the most profound controls. Peptone was the best organi...
Regulation of crystal protein biosynthesis by Bacillus thuringiensis: I. Effects of mineral elements and pH
ICGEN, Y; Icgen, BÜLENT; Özcengiz, Gülay (Elsevier BV, 2002-11-01)
Crystal protein synthesis by a local isolate of Bacillus thuringiensis was monitored and compared in association with growth and sporulation in media differing in mineral element content. Mg and Cu were the most important metals for the biosynthesis of 135 kDa and 65 kDa toxin components in that the former was essential and the latter was greatly stimulatory at 10(-6) to 10(-7) M concentration. Also the inclusion of Mn favored toxin production at concentrations ranging from 3 x 10(-4) to 10(-5) M. The omiss...
Bacteriocinogenic Potential of Enterococcus faecium Isolated from Wine
Dundar, Halil (Springer Science and Business Media LLC; 2016-09-01)
A total of 145 lactic acid bacteria isolated from a variety of Turkish red wines during malolactic fermentation were screened to find bacteriocin-producing strains. Among them, 14 isolates of Enterococcus faecium were identified to produce bacteriocins. PCR screening revealed that some isolates harbored entA and entB genes while some harbored entA, entB and entP genes. An isolate designated as Ent. faecium H46 was selected to characterize its bacteriocins. The bacteriocins were purified to homogeneity from ...
Citation Formats
B. İçgen and G. Özcengiz, “Evaluation of symbiotic effectiveness of various Rhizobium cicer strains,” RESEARCH IN MICROBIOLOGY, pp. 369–372, 2002, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/43226.