Abstract
Resistance of sugar beet seedlings to Rhizoctonia damping-off caused by Rhizoctonia solani has not been described. A series of preliminary characterisations using a single susceptible host and four different R. solani isolates suggested the disease progression pattern was predictable. Two AG-4 isolates and a less virulent AG-2-2 isolate (W22) showed a comparable pattern of disease progression in the growth chamber where disease index values increased for the first 5–6 days, were relatively constant for the next 7–8 days, and declined thereafter. Seedlings inoculated with a highly virulent AG-2-2 isolate (R-1) under the same conditions showed similar patterns for the first 4 days post-inoculation; however disease index values continued to increase until seedling death at 13–14 days. Similar results were observed in the greenhouse, and a small expanded set of other germplasm lines were screened. One tested germplasm accession, EL51, survived seedling inoculation with R. solani AG-2-2 R-1, and its disease progress pattern was characterised. In a field seedling disease nursery artificially inoculated with R. solani AG-2-2 R-1, seedling persistence was high with EL51, but not with a susceptible hybrid. Identification of EL51 as a source of resistance to Rhizoctonia damping-off may allow investigations into the Beta vulgaris–Rhizoctonia solani pathosystem and add value in sugar beet breeding.
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Abbreviations
- AG:
-
Anastomosis group
- CRR:
-
Crown and root rot
- DI:
-
Disease Index
- DPI:
-
Days post-inoculation
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Acknowledgements
We thank the Beet Sugar Development Foundation for partially funding this project, Cindy Wang, Reid Shepard, David Moldovan, Tim Duckert, and Scott Shaw for expert technical assistance and Dr. Linda Hanson for helpful discussions.
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Nagendran, S., Hammerschmidt, R. & Mitchell McGrath, J. Identification of sugar beet germplasm EL51 as a source of resistance to post-emergence Rhizoctonia damping-off. Eur J Plant Pathol 123, 461–471 (2009). https://doi.org/10.1007/s10658-008-9384-0
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DOI: https://doi.org/10.1007/s10658-008-9384-0