دراسة تأثير Rhizobium leguminosarum في نمو الفطر Fusarium oxysporum f.sp. lycopersici مخبريا

Abstract EN

This study was carried out to evaluate the antagonistic effect of Rhizobium leguminosarum isolates against F.

oxysporum f.

sp.

lycopersici, the causal organism of tomato wilt.

R.

leguminosarum was isolated from the root nodules of faba bean and characterized by biochemichal analysis (gelatin hydrolysis, glucose peptone agar, triple sugar ion agar test).

Fusarium oxysporum f.

sp.

lycopersici was isolated from tomato plants showing characteristic symptoms of Fusarium wilt disease.

These plants were planted in different locations along the Syrian coast.

Two isolates of R.

leguminosarum (R1 and R2) and eight F.

o.

f.

sp lycopersici isolates (FOL1, FOL2, FOL3, FOL4, FOL5, FOL6, FOL7, FOL8) were obtained.

The results demonstrated the effectiveness of the Rhizobium isolates in inhibiting F.

o.

f.

sp.

lycopersici in vitro.

Isolate R1 was the most effective and caused 68.05% growth inhibition of isolate FOL7.

The results also showed that these bacteria were able to produce volatile substances that led to the inhibition of F.

o.

f.

sp.

Lycopersici growth.

Isolate R1 was the most effective and caused 37.78% growth inhibition of isolate FOL7.