Isolation of Pythium oligandrum from Egyptian soil and its mycoparasitic effect on Pythium ultimum var. ultimum the damping-off organism of wheat |
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Authors: | Abdelzaher Hani M A Elnaghy Mohamed A Fadl-Allah Ezzat M |
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Institution: | (1) Department of Botany, El-Minia University, El-Minia, Egypt |
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Abstract: | Pythium oligandrum Drechsler bearing spherical sporangia with complex subglobose elements was isolated for the first time
in Egypt from agricultural field soil cultivated with alfalfa (Trifolium alexandrinum) in El-Minia, Egypt. This fungus was
found to be an active bio-control agent against P. ultimum var. ultimum, the damping-off organism of wheat. In agar plates,
P. oligandrum parasitized P. ultimum var. ultimum hyphae with the aid of thin haustorial branches or infection pegs, eventually
leading to host destruction. Incorporation of P. oligandrum into carboxymethylcellulose seed coating successfully eliminated
pre-emergence damping-off of wheat caused by P. ultimum var. ultimum, whereas Post-emergence damping-off was prevented by
adding inocula of P. oligandrum to the soil.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | Antagonism biological control damping-off Pythium oligandrum Pythium ultimum var ultimum |
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