Abstract
Typical symptoms of corky root were observed on iceberg lettuce (Lactuca sativa) in Queensland, Australia. Slowgrowing bacteria with colonies similar to strains of Rhizomonas suberifaciens or other Rhizomonas species were isolated from lettuce seedlings which had been inoculated with an extract from soil adhering to lettuce roots with corky root symptoms. DNA from all strains was tested for DNA homology with DNA from strain CAI of R. suberifaciens and strain W14 of Rhizomonas sp. Twenty seven strains had moderate (29.2–57.7%) to high (59.9–80.9%) DNA homology with strain CAI and slight (4.8–10.8%) DNA homology with strain WI4. All of these strains induced typical symptoms of corky root on lettuce seedlings, cv. Salinas, and tested positive in an enzyme-linked immunosorbent assay with monoclonal antibody MAb-Rs1 specific for R. suberifaciens. This is the first report of R. suberifaciens causing corky root of lettuce in Australia.
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References
Alvarez, J., Datnoff, L.E. and Nagata, R.T. (1992) — Crop rotation minimizes losses from corky root in Florida lettuce. Hortscience 27:66–68.
Amin, K.S. and Sequeira, L. (1966a) — Role of certain factors in the etiology of corky root rot of lettuce. Phytopathology 56:1047–1053.
Amin, K.S. and Sequeira, L. (1966b) — Phytotoxic substances from decomposing lettuce residues in relation to the etiology of corky root rot of lettuce. Phyfopathology 56:1054–1061.
Brown, P.R. and Michelmore, R.W. (1988) — The genetics of corky root resistance in lettuce. Phytopathology 78:1145–1150.
Busch, L.V. and Barron, G.L. (1963) — Root rot of head lettuce in Ontario. Canadian Journal of Plant Science 43: 166–173.
Datnoff, L.E. and Nagata, R.T. (1990) — Isolation of Rhizomonas suberifaciens in Florida. Plant Disease 74:394.
D’Ercole, N. (1981) — La suberosi radicale della lattuga. Colture Protette 10: 35–38.
Guzman, V.L. (1982) —Yield and quality response of crisp-head lettuce cultivars to seeding dates and farms in south Florida organic soils. Proceedings of the Florida State Horticulture Society 94: 182–185.
Guzman, V.L. (1984) — South Bay and Raleigh: Two crisphead lettuce cultivars resistant to corky root rot for organic soils. Circular S-310. Agricultural Experiment Station, Institute of Food and Agricultural Sciences, University of Florida, Gainesville.
Hartnett, J.P. and Lorbeer, J.W. (1971) — The production of a noninfectious lettuce root rot under controlled environmental and soil conditions. Phytopathology 61:1153–1158.
Hoff, J.K. and Newhall, A.G. (1960) —Corky root rot of iceberg lettuce on the mucklands of New York. Plant Disease Reporter 44: 333–339.
Jochimsen, K.N. and van Bruggen, A.H.C. (1990) — Classification of Rhizomonas suberifaciens, the causal agent of corky root of lettuce, in superfamily IV. Phyfopathology 80:964.
O’Brien, R.D. and van Bruggen, A.H.C. (1992) —Yield losses to iceberg lettuce due to corky root caused by Rhizomonas suberifaciens. Phytopathology 82:154–159.
Patterson, C.L., Grogan, R.G. and Campbell, R.N. (1986) — Economically important diseases of lettuce. Plant Disease 70: 982–987.
Persley, D.M., O’Brien, R. and Syme, J.R. (Eds) (1989) — Vegetable Crops. A Disease Management Guide. Queensland Department of Primary Industries, Brisbane, Australia.
Sequeira, L. (1970) — Resistance to corky root rot in lettuce. Plant Disease Reporter 54:754–758.
Van Bruggen, A.H.C., Brown, P.R. and Jochimsen, K.N. (1989) — Corky root of lettuce caused by strains of a gram-negative bacterium from muck soils of Florida, New York, and Wisconsin. Applied and Environmental Microbiology 55: 2635–2640.
Van Bruggen, A.H.C., Brown, P.R., Shennan, C. and Greathead, AS. (1990) —The effect of cover crops and fertilization with ammonium nitrate on corky root of lettuce. Plant Disease 74:584–589.
Van Bruggen, A.H.C., Grogan, R.G., Bogdanoff, C.P. and Waters, C.M. (1988) —Corky root of lettuce in California caused by a Gram-negative bacterium. Phytopathology 78:1139–1145.
Van Bruggen, A.H.C. and Jochimsen, K.N. (1992) — First report of Rhizomonas sp. causing corky root of lettuce in Europe. Netherlands Journal of Plant Pathology 98:45–56.
Van Bruggen, A.H.C., Jochimsen, K.N., Benedict, A.A. and Pollard, L.W. (1992) — Monoclonal antibodies for the detection of Rhizomonas suberifaciens, causal agent of corky root of lettuce, with enzyme immunoassays. Food and Agricultural lmmunology 4:27–40.
Van Bruggen, A.H.C., Jochimsen, K.N. and Brown, P.R. (1990) — Rhizomonas suberifaciens gen. nov., sp. nov., the causal agent of corky root of lettuce. International Journal of Systematic Bacteriology 40:175–188.
Yabuuchi, E., Yano, I., Oyaizu, H., Hashimoto, Y., Ezaki T. and Yamamoto, H. (1990) — Proposals of Sphingomonas paucimobilis gen. nov. and comb. nov., Sphingomonas parapaucimobilis sp. nov., Sphingomonas yanoikuyae sp. nov., Sphingomonas adhaesiva sp. nov., Sphingomonas capsulata comb. nov., and two genospecies of the genus Sphingomonas. Microbiology and lmmunology 34:99–110.
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van Bruggen, A.H.C., Jochimsen, K.N. First report of Rhizomonas suberifaciens causing corky root of lettuce in Australia. Australasian Plant Pathology 22, 22–27 (1993). https://doi.org/10.1071/APP9930022
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DOI: https://doi.org/10.1071/APP9930022