University of Khartoum

The in vitro Compatibility of some Rhizobium and Bradyrhizobium Strains with Fungicides

The in vitro Compatibility of some Rhizobium and Bradyrhizobium Strains with Fungicides

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Title: The in vitro Compatibility of some Rhizobium and Bradyrhizobium Strains with Fungicides
Author: Ahmed, T. H. Mohamed; Elsheikh, Elsiddig A.E.; Mahdi, A.A.
Abstract: Laboratory experiments were conducted to study the effects of different concentrations (0,10,20,50,100,200,500 and 1000 μg/l) of the fungicides Captan, Thiram, Luxan, Fernasan-D and Milcurb on inhibition of growth and colony sizes of seven Rhizobium strains (4 introduced and 3 locally isolated) and ten Bradyrhizobium strains (5 introduced and 5 locally isolated). The effects were determined by measuring the colony size and the diameter of the zone of inhibited growth. Fungicides differed in their effects on Rhizobium and Bradyrhizobium strains. Captan at the concentrations of 100 and1000μg/l was the most toxic, followed by Thiram, Milcurb, Luxan then Frernasan-D.Increasing the concentration of each fungicide from 0 to 10, 20, 50, 100, 200, 500 and 1000 μg/l reduced the colony sizes of rhizobial and bradyrhizobial strains with different degrees of sensitivity. All strains tolerated low fungicide concentrations (< 100 μg/l) but they were sensitive to high concentrations (>500 μg/l) with varying degrees of sensitivity. Rhizobium strains were more tolerant than Bradyrhizobium strains, and no clear differences were observed between the introduced and the locally isolated strains.
URI: http://khartoumspace.uofk.edu/handle/123456789/17704
Date: 2015-12-15


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