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Article
Resistance to Phialophora gregata Is Expressed in the Stems of Resistant Soybeans
Plant Disease
  • G. M. Tabor, Iowa State University
  • G. L. Tylka, Iowa State University
  • S. C. Cianzio, Iowa State University
  • C. R. Bronson, Iowa State University
Document Type
Article
Publication Version
Published Version
Publication Date
8-1-2003
DOI
10.1094/PDIS.2003.87.8.970
Abstract
Growth chamber experiments were conducted to determine if resistance to Phialophora gregata, the causal agent of brown stem rot (BSR) of soybean, is expressed in the stems of resistant soybean genotypes. Upon introduction of the pathogen into the base of stems of 2-week-old seedlings, the fungus advanced with the growing tips of plants of susceptible genotypes but lagged behind in resistant genotypes. Five weeks after introduction of the pathogen, both mean percent stem length colonized by P. gregata and mean percentage of symptomatic trifoliate leaflets were significantly less for resistant than for susceptible genotypes. These results indicate that resistance can be expressed in the stems of resistant soybean plants and suggest that stem inoculation methods may be useful for assessing resistance to P. gregata. Also, in our experiments, internal stem discoloration was not as useful as colonization and foliar symptoms in discriminating resistant from susceptible genotypes.
Comments

This article is published as Tabor, G. M., G. L. Tylka, S. C. Cianzio, and C. R. Bronson. "Resistance to Phialophora gregata is expressed in the stems of resistant soybeans." Plant disease 87, no. 8 (2003): 970-976, doi: 10.1094/PDIS.2003.87.8.970. Posted with permission.

Copyright Owner
The American Phytopathological Society
Language
en
File Format
application/pdf
Citation Information
G. M. Tabor, G. L. Tylka, S. C. Cianzio and C. R. Bronson. "Resistance to Phialophora gregata Is Expressed in the Stems of Resistant Soybeans" Plant Disease Vol. 87 Iss. 8 (2003) p. 970 - 976
Available at: http://works.bepress.com/gregory-tylka/184/