Method for making biocontrol agents rhizosphere-competent

Chemistry: molecular biology and microbiology – Micro-organism – per se ; compositions thereof; proces of... – Fungi

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4351721, 435945, 424 93B, 424 93Q, 47 576, C12N 114, C12N 1500, A01N 6300, A01C 106

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active

052042600

ABSTRACT:
Soilborne rhizosphere-incompetent biocontrol agents can be converted into rhizosphere-competent agents by exposing them to a mutagenic agent and then screening the exposed rhizosphere-incompetent agent for a strain showing increased cellulase production. The increased cellulase production characteristic serves to convert the originally rhizosphere-incompetent agent into one which is rhizosphere-competent. Seeds of plants to be protected against various diseases can then be treated with the rhizosphere-competent strain. The roots of the plant, as well as its original seed, are protected by biocontrol agents produced by the disclosed process.

REFERENCES:
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Sivan, A., and Harmon, G. E. 1991. Improved Rhizosphere Competence in a Protoplast Fusion Progeny of Trichoderma Harzianum. Journal of General Microbiology (1991), 137, 0000--0000.
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Papavizas, G. C. Trichoderma and Gliocladium: Biology, Ecology and Potential for Biocontrol Ann. Rev. Phytopathology 23: 23-54 at p. 35, 1985.
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Ahmad, J. S. & Baker, Ralph, Rhizosphere-Competence of Trichoderma Harzianum, Phytopathology 77: 182-189.
Ahmad, J. S. & Baker, Ralph, Rhizosphere-Competence of Benomyl-Tolerant Mutants of Trichoderma spp., Can. J. Microbiol 34: 694-696 (1988).
Ahmad, J. S., & Baker, Ralph, Growth of Rhizosphere-Competent Mutants of Trichoderma Harzianum on Carbon, Can. J. Microbiol. 34: 807-814.
Baker, Ralph, "Induction of Rhizosphere Competence in Bioconatrol Fungus (1991) Trichoderma", Kluwer Academic Publishers, The Rhizosphere and Plant Growth, pp. 221-228.
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