Bacterial and fungal metabolites of rhizospheric microflora of cotton antagonistic to Rhizoctonia solani Kühn |
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| Authors: | M S Naim A A El-Esawy |
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| Institution: | (1) Botany Department, Faculty of Science, A'in Shams University, Abbassia, Cairo, U.A.R.;(2) Present address: College of Advanced Technology, Tripoli, Libya |
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| Abstract: | Summary Growth response ofRhizoctonia solani
Kühn, the damping-off fungus, to metabolites of selected antagonistic rhizospheric bacteria and fungi of some Egyptian cotton varieties, namely, two strains ofBacillus subtilis
Cohn,Aspergillus terreus
Thom, andAspergillus flavus
Link produced in culture media containing nitrate- or ammonium-nitrogen sources, proved the potency ofB. subtilis metabolites in inhibitingR. solani mycelial growth whether from nitrate- or ammonium-nitrogen culture media. Metabolite filtrates ofB. subtilis (II) are more potent than those ofB. subtilis (I). Increasing concentration of bacterial metabolite filtrates resulted in a decreased mycelial dry weight ofR. solani. The bacterial inhibitory factor forR. solani mycelial growth is partially affected by heat. Metabolite filtrates ofA. terreus from nitrate-nitrogen are slightly more potent than from ammonium-nitrogen culture media while an opposite relation is evident withA. flavus metabolites. Growth responses ofR. solani to different experimental dilutions of metabolite filtrates ofA. terreus andA. flavus proved the intervention of the nutritive factor in witholding growth of the damping-off fungus. |
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