Evaluation of glyphosate-tolerant soybean cultivars for resistance to bacterial pustule |
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Authors: | Lopa Goradia Glen L Hartman Steven L Daniel |
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Institution: | (1) Department of Biological Sciences, Eastern Illinois University, 600 Lincoln Avenue, Charleston, Illinois 61920, USA;(2) USDA-ARS, Department of Crop Sciences, National Soybean Research Center, University of Illinois at Urbana-Champaign, 1101 West Peabody Drive, Urbana, IL 61801, USA |
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Abstract: | Xanthomonas axonopodis pv. glycines causes bacterial pustule of soybean, which is a common disease in many soybean-growing areas of the world and is controlled
by a single recessive gene (rxp gene) commonly found in many conventional glyphosate-sensitive soybean cultivars. Since glyphosate-tolerant cultivars are
commonly planted today, there has been no information about whether these new cultivars have bacterial pustule resistance.
The goal of this study was to screen glyphosate-tolerant soybean cultivars for resistance to X. axonopodis pv. glycines. Three experiments were completed to evaluate resistance. In experiment 1, 525 commercial glyphosate-tolerant cultivars from
2001 were inoculated with X. axonopodis pv. glycines strain UIUC-1. Following inoculation, many of the cultivars were resistant (developed no detectable pustule symptoms) although
152 (~29%) developed bacterial pustule. In experiment 2, the aggressiveness of three strains (UIUC-1, UIUC-2, and ATCC 17915)
of X. axonopodis pv. glycines were compared on three bacterial pustule-susceptible, glyphosate-tolerant cultivars. One strain (UIUC-1) was less aggressive
than the other two (UIUC-2 and ATCC 17915) on all three cultivars examined. In experiment 3, 45 cultivars from 2005 (all different
from 2001) were inoculated with X. axonopodis pv. glycines ATCC 17915. A range of disease severities developed with five cultivars (11%) having disease severity ratings as high as
or higher than those on a susceptible check cultivar. Overall, these results suggested that resistance to bacterial pustule
occurs in glyphosate-tolerant soybean cultivars, but not at 100% frequency, which means bacterial pustule outbreaks could
occur when a susceptible cultivar is planted and conditions are conducive for bacterial pustule development. |
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Keywords: | Xanthomonas axonopodis pv glycines Roundup Ready? soybeans Foliar bacterial pathogen |
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