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Article
Evaluation of glyphosate-tolerant soybean cultivars for resistance to bacterial pustule
European Journal of Plant Pathology (2009)
  • Lopa Goradia, Eastern Illinois University
  • Glen Hartman, University of Illinois at Urbana-Champaign
  • Steven L. Daniel, Eastern Illinois University
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
Publication Date
2009
Citation Information
Lopa Goradia, Glen Hartman and Steven L. Daniel. "Evaluation of glyphosate-tolerant soybean cultivars for resistance to bacterial pustule" European Journal of Plant Pathology Vol. 124 Iss. 2 (2009)
Available at: http://works.bepress.com/steven_daniel/2/