Study the effect of Rhizobium leguminosarum bv. viciae bacteria on the growth of fungi isolated from the Vicia faba plant laboratory

Abstract

This study aimed at the effect of bacteria Rhizobium leguminosarum bv.viciae   on the growth of a group of fungi, where bacteria R.leguminosarum bv.viciae   were isolated from the root nodes with the bean plant using the medium Manitol yeast Extract agar prepared and diagnosed by morphology, microscopy, and biochemical tests.

 the study also included the isolation of infected fungi of bean leaf, they are (Fusarium sp. , Rhizoctonia solani, Alternaria altarnata )and fungi Fusarium solani , Aspregillius niger, Penicillium sp were isolated from the rhizosphere layer, Where the effectiveness of isolated bacteria R.leguminosarum bv.viciae    were tested on inhibiting the growth of isolated fungi, the results showed different rates according to type of fungi.

It was more influential on fungi (Fusarium sp , R. solani , A. alternata up to ( 1.3,1.7, 2.2 )cm in diameter compared to control while less impact on fungi A. niger up to ( 4 cm ) in diameter. compared to control up to 4.5cm

The study showed the study showed bacteria's R.leguminosarum bv.viciae ability to inhibit fungus growth because of its ability to secrete metabolic substances in the medium that contain beta lactamase enzyme thus it has an important role in biological control.