Use of Cyanobacteria for Controlling Flax Seedling Blight

Document Type : Original Article

Authors

1 Dept. of Microbiology, Fac. of Agric., Mansoura Univ., Mansoura, Egypt

2 Plant Pathology Research Institute, ARC, Giza, Egypt

Abstract

Cyanobacteria are one of important groups of prokaryotes  due to their effects on growth and development of plants and its role in biological control of  phytopathogenic  fungi  such as :  Fusarium oxysporum and Rhizoctonia solani  on flax  by producing various biologically active substances . In the present study , fourteen  cyanobacterial strains were isolated from rice rhizosphere in kafr El–sheikh (k) ( North Delta Region ) and El- Dakahliya (D) ( East Delta Region ) . Only five cyanobacterial strains showed antagonistic effects against the both pathogenic fungi and were indentified as Nostoc muscorum k , Anabaena oryzae D , Anabaena oryzae k , Nostoc pruniforme D and Oscillatoria brevis D. The strains  were analysed  for phosphate  solubilization , production  of  IAA , ammonia , HCN , production  of some enzymes , and effect of their filterates on seed germination of flax seeds . Flax seeds treated with cyanobacterial filtrates germinated  faster and produced higher seedlings compared with  the nontreated ones .

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