<Emphasis Type="Italic">Stenotrophomonas maltophilia</Emphasis>: a new potential biocontrol agent of <Emphasis Type="Italic">Ralstonia solanacearum</Emphasis>, causal agent of potato brown rot |
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| Authors: | N A S Messiha A D van Diepeningen N S Farag S A Abdallah J D Janse A H C van Bruggen |
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| Institution: | (1) Wageningen University, Biological Farming Systems Group, Marijkeweg 22, 6709 PG Wageningen, The Netherlands;(2) Department of Bacteriology, Plant Protection Service, Geertjesweg 15, 6706 EA Wageningen, The Netherlands;(3) Potato Brown Rot Project (PBRP), 3 El-Amira Fatma Ismail Street, Dokki, Cairo, Egypt;(4) Laboratory of Genetics, Wageningen University, Arboretumlaan 4, 6703 BD Wageningen, The Netherlands;(5) Plant Pathology Research Institute(PPRI), 9 Gamaa Street, Giza, Cairo, Egypt;(6) Faculty of Science, Department of Botany, Benha University, Benha, Egypt;(7) Department of Bacteriology, Plant protection service (PD), P.O. Box 9102, 6700 HC Wageningen, The Netherlands |
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| Abstract: | Stenotrophomonas maltophilia was isolated from the rhizosphere of eggplant in the Nile Delta of Egypt, and its antagonistic potential against Ralstonia solanacearum race 3 biovar 2, the causal agent of potato brown rot, was in vitro evaluated on KB agar medium and in vivo on potato plants.
In vitro, four isolates of S. maltophilia (PD3531, PD3532, PD3533, and PD3534) appeared antagonistic. The isolate (PD3533) was screened as the most promising antagonist
for the in vivo tests. In the greenhouse, the antagonist was applied directly to soil or by bacterization of potato eyepieces.
Stenotrophomonas maltophilia significantly suppressed potato brown rot in Egyptian clay soil but not in Dutch clay soil. Survival of a rifampicin and
chloramphenicol-resistant S. maltophilia strain PD4560 was investigated in two pairs of clay soils, conventionally and organically managed, from Egypt and the Netherlands.
The survival of S. maltophilia was significantly less in Dutch than in Egyptian soils, while the converse occurred for R. solanacearum. These results are in agreement with those obtained in the in vivo biocontrol tests. In conclusion, S. maltophilia may be useful for control of brown rot in the area where it was originally isolated, the Nile Delta in Egypt. |
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| Keywords: | Antibiotic resistance Biological control Clay soils CMC carrier Organic and conventional management Survival |
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