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Glandorf DC, van der Sluis I, Anderson AJ, Bakker PA, Schippers B. Agglutination, adherence, and root colonization by fluorescent pseudomonads. Appl Environ Microbiol 2010; 60:1726-33. [PMID: 16349268 PMCID: PMC201554 DOI: 10.1128/aem.60.6.1726-1733.1994] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Two fractions of agglutination activity towards fluorescent pseudomonads were detected in root washes of potato, tomato, wheat, and bean. High-molecular-mass (>10 Da) components in crude root washes agglutinated only particular saprophytic, fluorescent Pseudomonas isolates. Ion-exchange treatment of the crude root washes resulted in preparations of lower-molecular-mass (10 to 10 Da) fractions which agglutinated almost all Pseudomonas isolates examined. Also, components able to suppress agglutination reactions of pseudomonads with the lower-molecular-mass root components were detected in crude root washes of all crops studied. Pseudomonas isolates were differentially agglutinated by both types of root components. The involvement of these two types of root components in short-term adherence and in colonization was studied in potato, tomato, and grass, using Pseudomonas isolates from these crops. Short-term adherence of isolates to roots was independent of their agglutination with either type of root components. With agglutination-negative mutants, the high-molecular-mass components seemed to be involved in adherence of Pseudomonas putida Corvallis to roots of all crops studied. Short-term adherence to roots of four Pseudomonas isolates could be influenced by addition of both crude and ion-exchange-treated root washes, depending on their agglutination phenotype with these root wash preparations. Potato root colonization by 10 different isolates from this crop, over a period of 7 days, was not correlated with their agglutination phenotype. Agg mutants of P. putida Corvallis were not impaired in root colonization. It is concluded that the root agglutinins studied can be involved in short-term adherence of pseudomonads to roots but do not play a decisive role in their root colonization.
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Affiliation(s)
- D C Glandorf
- Section of Plant Pathology, Department of Plant Ecology and Evolutionary Biology, Utrecht University, 3584 CA Utrecht, The Netherlands
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Abstract
Different strains of Pseudomonas putida and P. fluorescens isolated from the rhizosphere and phyllosphere were tested for surface activity in droplet cultures on polystyrene. Droplets of 6 of the 12 wild types tested spread over the surface during incubation, and these strains were considered surface active; strains not showing this reaction were considered non-surface active. Similar reactions were observed on pieces of wheat leaves. Supernatants from centrifuged broth cultures behaved like droplets of suspensions in broth; exposure to 100 degrees C destroyed the activity. Average contact angles of the supernatants of surface-active and non-surface-active strains on polystyrene were 24 degrees and 72 degrees , respectively. The minimal surface tension of supernatants of the surface-active strains was about 46 mN/m, whereas that of the non-surface-active strains was 64 mN/m (estimations from Zisman plots). After 6 days of incubation, wheat flag leaves sprayed with a dilute suspension of a surface-active strain of P. putida (WCS 358RR) showed a significant increase in leaf wettability, which was determined by contact angle measurements. Increasing the initial concentration of bacteria and the amount of nutrients in the inoculum sprayed on leaves reduced the contact angles from 138 degrees on leaves treated with antibiotics (control) to 43 degrees on leaves treated with surface-active bacteria. A closely related strain with no surface activity on polystyrene did not affect leaf wettability, although it was present in densities similar to those of the surface-active strain. Nutrients alone could occasionally also increase leaf wettability, apparently by stimulating naturally occurring surface-active bacteria. When estimating densities of Pseudomonas spp. underneath droplets with low contact angles, it appeared that populations on leaves treated with a surface-active strain could vary from about 10 to 10 CFU cm, suggesting that the surface effect may be prolonged after a decline of the population. The possible ecological implications are discussed.
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Affiliation(s)
- L Bunster
- Willie Commelin Scholten Phytopathological Laboratory, Javalaan 20, 3742 CP Baarn, The Netherlands
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Raaijmakers JM, Bitter W, Punte HL, Bakker PA, Weisbeek PJ, Schippers B. Siderophore receptor PupA as a marker to monitor wild-type Pseudomonas putida WCS358 in natural environments. Appl Environ Microbiol 1994; 60:1184-90. [PMID: 8017914 PMCID: PMC201457 DOI: 10.1128/aem.60.4.1184-1190.1994] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
For application of genetically engineered fluorescent Pseudomonas spp., specific markers are required for monitoring of wild-type Pseudomonas strains and their genetically modified derivatives in natural environments. In this study, the specific siderophore receptor PupA of plant growth-promoting Pseudomonas putida WCS358 was used as a marker to monitor wild-type strain WCS358. After introduction into natural soil and rhizosphere environments, strain WCS358 could be recovered efficiently on a medium amended with 300 microM pseudobactin 358. Although low population densisties of indigenous pseudomonads (less than or equal to 10(3)/g of soil or root) were recovered on the pseudobactin 358-amended medium, subsequent agglutination assays with a WCS358-specific polyclonal antiserum enabled accurate monitoring of populations of wild-type strain WCS358 over a range of approximately 10(3) to 10(7) CFU/g of soil or root. Genetic analysis of the background population by PCR and Southern hybridization revealed that natural occurrence of the pupA gene was limited to a very small number of indigenous Pseudomonas spp. which are very closely related to P. putida WCS358. The PupA marker system enabled the study of differences in rhizosphere colonization among wild-type strain WCS358, rifampin-resistant derivative WCS358rr, and Tn5 mutant WCS358::xylE. Chromosomally mediated rifampin resistance did not affect the colonizing ability of P. putida WCS358. However, Tn5 mutant WCS358::xylE colonized the radish rhizosphere significantly less than did its parental strain.
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Affiliation(s)
- J M Raaijmakers
- Department of Plant Ecology and Evolutionary Biology, Utrecht University, The Netherlands
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Lemanceau P, Bakker PA, De Kogel WJ, Alabouvette C, Schippers B. Antagonistic Effect of Nonpathogenic
Fusarium oxysporum
Fo47 and Pseudobactin 358 upon Pathogenic
Fusarium oxysporum
f. sp.
dianthi. Appl Environ Microbiol 1993; 59:74-82. [PMID: 16348860 PMCID: PMC202057 DOI: 10.1128/aem.59.1.74-82.1993] [Citation(s) in RCA: 55] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Pseudobactin production by
Pseudomonas putida
WCS358 significantly improves biological control of fusarium wilt caused by nonpathogenic
Fusarium oxysporum
Fo47b10 (P. Lemanceau, P. A. H. M. Bakker, W. J. de Kogel, C. Alabouvette, and B. Schippers, Appl. Environ. Microbiol. 58:2978-2982, 1992). The antagonistic effect of Fo47b10 and purified pseudobactin 358 was studied by using an in vitro bioassay. This bioassay allows studies on interactions among nonpathogenic
F. oxysporum
Fo47b10, pathogenic
F. oxysporum
f. sp.
dianthi
WCS816, and purified pseudobactin 358, the fluorescent siderophore produced by
P. putida
WCS358. Both nonpathogenic and pathogenic
F. oxysporum
reduced each other's growth when grown together. However, in these coinoculation experiments, pathogenic
F. oxysporum
WCS816 was relatively more inhibited in its growth than nonpathogenic
F. oxysporum
Fo47b10. The antagonism of nonpathogenic
F. oxysporum
against pathogenic
F. oxysporum
strongly depends on the ratio of nonpathogenic to pathogenic
F. oxysporum
densities: the higher this ratio, the stronger the antagonism. This fungal antagonism appears to be mainly associated with the competition for glucose. Pseudobactin 358 reduced the growth of both
F. oxysporum
strains, whereas ferric pseudobactin 358 did not; antagonism by pseudobactin 358 was then related to competition for iron. However, the pathogenic
F. oxysporum
strain was more sensitive to this antagonism than the nonpathogenic strain. Pseudobactin 358 reduced the efficiency of glucose metabolism by the fungi. These results suggest that pseudobactin 358 increases the intensity of the antagonism of nonpathogenic
F. oxysporum
Fo47b10 against pathogenic
F. oxysporum
WCS816 by making WCS816 more sensitive to the glucose competition by Fo47b10.
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Affiliation(s)
- P Lemanceau
- Section of Plant Pathology, Department of Plant Ecology and Evolutionary Biology, University of Utrecht, 3508 TB Utrecht, The Netherlands
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Lemanceau P, Bakker PA, De Kogel WJ, Alabouvette C, Schippers B. Effect of pseudobactin 358 production by Pseudomonas putida WCS358 on suppression of fusarium wilt of carnations by nonpathogenic Fusarium oxysporum Fo47. Appl Environ Microbiol 1992; 58:2978-82. [PMID: 1444411 PMCID: PMC183036 DOI: 10.1128/aem.58.9.2978-2982.1992] [Citation(s) in RCA: 149] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Nonpathogenic Fusarium oxysporum Fo47b10 combined with Pseudomonas putida WCS358 efficiently suppressed fusarium wilt of carnations grown in soilless culture. This suppression was significantly higher than that obtained by inoculation of either antagonistic microorganism alone. The increased suppression obtained by Fo47b10 combined with WCS358 only occurred when Fo47b10 was introduced at a density high enough (at least 10 times higher than that of the pathogen) to be efficient on its own. P. putida WCS358 had no effect on disease severity when inoculated on its own but significantly improved the control achieved with nonpathogenic F. oxysporum Fo47b10. In contrast, a siderophore-negative mutant of WCS358 had no effect on disease severity even in the presence of Fo47b10. Since the densities of both bacterial strains at the root level were similar, the difference between the wild-type WCS358 and the siderophore-negative mutant with regard to the control of fusarium wilt was related to the production of pseudobactin 358. The production of pseudobactin 358 appeared to be responsible for the increased suppression by Fo47b10 combined with WCS358 relative to that with Fo47b10 alone.
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Affiliation(s)
- P Lemanceau
- Department of Plant Ecology and Evolutionary Biology, University of Utrecht, The Netherlands
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Peer R, Schippers B. Lipopolysaccharides of plant-growth promoting Pseudomonas sp. strain WCS417r induce resistance in carnation to Fusarium wilt. ACTA ACUST UNITED AC 1992. [DOI: 10.1007/bf01996325] [Citation(s) in RCA: 123] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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van Peer R, Schippers B. Biocontrol of Fusarium Wilt by Pseudomonas Sp. Strain Wcs417R: Induced Resistance and Phytoalexin Accumulation. Biotic Interactions and Soil-Borne Diseases 1991. [DOI: 10.1016/b978-0-444-88728-3.50051-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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De Weger LA, van der Vlugt CI, Wijfjes AH, Bakker PA, Schippers B, Lugtenberg B. Flagella of a plant-growth-stimulating Pseudomonas fluorescens strain are required for colonization of potato roots. J Bacteriol 1987; 169:2769-73. [PMID: 3294806 PMCID: PMC212183 DOI: 10.1128/jb.169.6.2769-2773.1987] [Citation(s) in RCA: 154] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
The role of motility in the colonization of potato roots by Pseudomonas bacteria was studied. Four Tn5-induced flagella-less mutants of the plant-growth-stimulating P. fluorescens WCS374 appeared to be impaired in their ability to colonize growing potato roots.
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Löffler HJM, Cohen EB, Oolbekkink GT, Schippers B. Nitrite as a factor in the decline of Fusarium oxysporum f. sp. dianthi in soil supplemented with urea or ammonium chloride. ACTA ACUST UNITED AC 1986. [DOI: 10.1007/bf01999797] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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de Weger LA, van Boxtel R, van der Burg B, Gruters RA, Geels FP, Schippers B, Lugtenberg B. Siderophores and outer membrane proteins of antagonistic, plant-growth-stimulating, root-colonizing Pseudomonas spp. J Bacteriol 1986; 165:585-94. [PMID: 3003032 PMCID: PMC214459 DOI: 10.1128/jb.165.2.585-594.1986] [Citation(s) in RCA: 109] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
As an approach to understanding the molecular basis of the reduction in plant yield depression by root-colonizing Pseudomonas spp. and especially of the role of the bacterial cell surfaces in this process, we characterized 30 plant-root-colonizing Pseudomonas spp. with respect to siderophore production, antagonistic activity, plasmid content, and sodium dodecyl sulphate-polyacrylamide gel electrophoresis patterns of their cell envelope proteins. The results showed that all strains produce hydroxamate-type siderophores which, because of the correlation with Fe3+ limitation, are thought to be the major factor responsible for antagonistic activity. Siderophore-negative mutants of two strains had a strongly decreased antagonistic activity. Five strains maintained their antagonistic activity under conditions of iron excess. Analysis of cell envelope protein patterns of cells grown in excess Fe3+ showed that most strains differed from each other, although two classes of similar or identical strains were found. In one case such a class was subdivided on the basis of the patterns of proteins derepressed by iron limitation. Small plasmids were not detected in any of the strains, and only one of the four tested strains contained a large plasmid. Therefore, it is unlikely that the Fe3+ uptake system of the antagonistic strains is usually plasmid encoded.
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Marugg JD, van Spanje M, Hoekstra WP, Schippers B, Weisbeek PJ. Isolation and analysis of genes involved in siderophore biosynthesis in plant-growth-stimulating Pseudomonas putida WCS358. J Bacteriol 1985; 164:563-70. [PMID: 2997118 PMCID: PMC214289 DOI: 10.1128/jb.164.2.563-570.1985] [Citation(s) in RCA: 102] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
The plant-growth-stimulating Pseudomonas putida WCS358 was mutagenized with transposon Tn5. The resulting mutant colony bank was screened for mutants defective in the biosynthesis of the fluorescent siderophore. A total of 28 mutants, divided into six different classes, were isolated that were nonfluorescent or defective in iron acquisition or both. These different types of mutants together with the probable overall structure of the siderophore, i.e., a small peptide chain attached to a fluorescing group, suggest a biosynthetic pathway in which the synthesis of the fluorescing group is preceded by the synthesis of the peptide part. A gene colony bank of P. putida WCS358 was constructed with the broad-host-range cosmid vector pLAFR1. This genomic library, established in Escherichia coli, was mobilized into the 28 individual mutants, screening for transconjugants restored in fluorescence or growth under iron-limiting conditions or both. A total of 13 cosmids were found to complement 13 distinct mutants. The complementation analysis revealed that at least five gene clusters, with a minimum of seven genes, are needed for siderophore biosynthesis. Some of these genes seem to be arranged in an operon-like structure.
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Löffler HJM, Schippers B. Inhibition of chlamydospore production in Fusarium oxysporum by ammonia and high ion concentrations. Can J Microbiol 1985. [DOI: 10.1139/m85-095] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
NH4Cl in a Tris–HCl buffered solution inhibited chlamydospore production in germinated macroconidia of Fusarium oxysporum. KCl, CaCl2, and buffer solutions at higher concentrations were also inhibitory but to a lesser extent. At fixed concentrations of NH4Cl and KCl mixed at different ratios, chlamydospore production decreased with increasing concentrations of [Formula: see text]. This effect was stronger at pH 8.5 than at pH 7.5, suggesting that NH3 is the active component. In conclusion, both NH3 and high ion concentrations can be inhibitory to the production of chlamydospores in salt solutions. No qualitative differences were found between chlamydospores formed at different concentrations of ammonia.
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Abstract
Ammonia applied as NH4Cl in a Tris–HCl buffered solution (pH 7.5 or 8.5) reduced germination of conidia of Fusarium solani f. sp. phaseoli at 250 mM NH4Cl (pH 7.5) or 5 mM NH4Cl (pH 8.5) and of conidia of Cochliobolus victoriae at 5, 50, or 250 mM NH4Cl (pH 7.5) or 5 mM NH4Cl (pH 8.5). Under these conditions the rate of 14C release from conidia of these fungi and of Botrytis cinerea, grown on a medium with [14C]glucose, did not increase. It is concluded that no enhanced release of carbon compounds from conidia is involved in ammonia-induced mycostasis.
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Schippers B, Boerwinkel DJ, Konings H. Ethylene not responsible for inhibition of conidium germination by soil volatiles. ACTA ACUST UNITED AC 1978. [DOI: 10.1007/bf01981536] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Fokkema NJ, Laar JAJ, Nelis-Blomberg AL, Schippers B. The buffering capacity of the natural mycoflora of rye leaves to infection by Cochliobolus sativus, and its susceptibility to benomyl. ACTA ACUST UNITED AC 1975. [DOI: 10.1007/bf01976329] [Citation(s) in RCA: 35] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Schippers B. Reduced chlamydospore formation and lysis of macroconidia of Fusarium solani f. cucurbitae in nitrogen-amended soil. ACTA ACUST UNITED AC 1972. [DOI: 10.1007/bf01977318] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Salemink CA, Schuring F, Kerling LCP, Schippers B. The isolation of a phytotoxin from cultures ofDidymella applanata (Niessl)sacc. ACTA ACUST UNITED AC 1966. [DOI: 10.1007/bf01900939] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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