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| Web URL(s): | http://www.apsnet.org/publications/phytopathology/backissues/Documents/1992Articles/Phyto82n02_190.pdf
Last checked: 10/15/2015
Requires: PDF Reader |
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| Publication Type:
| Refereed |
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| Author(s): | Maurhofer, M.;
Keel, C.;
Schnider, U.;
Voisard, C.;
Haas, D.;
Defago, G. |
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| Author Affiliation: | First, Second, and sixth authors: Department of Plant Sciences/Phtomedicine; and third, fourth, and fifth authors: Department of Microbiology, Swiss Federal Institute of Technology, CH-8092 Zurich, Switzerland |
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| Title: | Influence of enhanced antibiotic production in Pseudomonas fluorescents strain CHAO on its disease suppressive capacity |
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| Source: | Phytopathology. Vol. 82, No. 2, February 1992, p. 190-195. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| Keywords: | TIC Keywords: Pseudomonas; Diseases; Pythium ultimum; Antibiotics; Metabolites
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| Abstract/Contents: | Pseudomonas fluorescents strain CHAO suppresses various plant diseases caused by soilborne fungi and produces several antobiotic metabolites two of which have been identified as pholuteorin (Plt) and 2,4-diacetylphloroglucinol (Phl). A cosmid (pME3090) carrying a 22-kb insert of strain CHAO DNA enhanced, in a CHAO backround, the production of Plt. in vitro. The production of Phl was also increased but to a smaller extent. In a gnotobiotic system, the recombinant strain protected cucumber plants against disease caused by Pythium utltimum more than did wild type CHAO. In the absence of the pathogen, strains CHAO and CHAO/pME3090 had no influence on cucumber. Both strains protected cress and sweet corn from P. ultimum. However, in the presence of P. ultimum, fresh weights of cress and sweet corn plants protected by strain CHAO/pME3090 were lower compared to those of plants protected by strain CHAO. Strain CHAO/pMEe3090 (but not strain CHAO) strongly reduced the growth of cress and sweet corn in the absence of the pathogen. In vitro, Plt was much more toxic to the growth of P. ultimum than was Phl. Sweet corn, cress, and cucumber were all inhibited by Plt and Phl; cucumber, however, was less sensitive to Phl than were cress and sweet corn. These results suggest that enhanced pyoluteorin production might be responsible for the increased capacity of strain CHAO/pME3090 to suppress damping-off of cucumber and that the strain's deleterious effect on cress and sweet corn might be due to the phytotoxic properties of both antibiotics. We conclude that, depending on the host-pathogen system, enhanced antibiotic production by P. fluorenscents may result in improved disease suppression or, in contrast, in a toxic effect on the plant. |
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| Language: | English |
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| References: | 32 |
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| Note: | Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Maurhofer, M., C. Keel, U. Schnider, C. Voisard, D. Haas, and G. Defago. 1992. Influence of enhanced antibiotic production in Pseudomonas fluorescents strain CHAO on its disease suppressive capacity. Phytopathology. 82(2):p. 190-195. |
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| Web URL(s):
http://www.apsnet.org/publications/phytopathology/backissues/Documents/1992Articles/Phyto82n02_190.pdf
Last checked: 10/15/2015
Requires: PDF Reader |
| 
MSU catalog number: SB 599 .P48 |
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