European Journal of Plant Pathology

, Volume 124, Issue 2, pp 331–335 | Cite as

Evaluation of glyphosate-tolerant soybean cultivars for resistance to bacterial pustule

  • Lopa Goradia
  • Glen L. Hartman
  • Steven L. Daniel
Article

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.

Keywords

Xanthomonas axonopodis pv. glycines Roundup Ready® soybeans Foliar bacterial pathogen 

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Copyright information

© KNPV 2008

Authors and Affiliations

  • Lopa Goradia
    • 1
  • Glen L. Hartman
    • 2
  • Steven L. Daniel
    • 1
  1. 1.Department of Biological SciencesEastern Illinois UniversityCharlestonUSA
  2. 2.USDA-ARS, Department of Crop Sciences, National Soybean Research CenterUniversity of Illinois at Urbana-ChampaignUrbanaUSA

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