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Article
Heterodera glycines Infection Increases Incidence and Severity of Brown Stem Rot in Both Resistant and Susceptible Soybean
Plant Disease
  • G. M. Tabor, Iowa State University
  • G. L. Tylka, Iowa State University
  • J. E. Behm, Monsanto Company
  • C. R. Bronson, Iowa State University
Document Type
Article
Publication Version
Published Version
Publication Date
6-1-2003
DOI
10.1094/PDIS.2003.87.6.655
Abstract
Growth chamber experiments were conducted to investigate whether parasitism by Heterodera glycines, the soybean cyst nematode, increases incidence and severity of brown stem rot (BSR) of soybean, caused by Phialophora gregata, in both resistant and susceptible soybean cultivars. Soybean genotypes with various combinations of resistance and susceptibility to both pathogens were inoculated with P. gregata alone or P. gregataplus H. glycines. In most tests of H. glycines-susceptible genotypes, incidence and severity of internal stem discoloration, characteristic of BSR, was greater in the presence than in the absence of H. glycines, regardless of susceptibility or resistance to BSR. There was less of an increasing effect of H. glycines on stem symptoms in genotypes resistant to both BSR and H. glycines; however, P. gregata colonization of these genotypes was increased. Stems of both a BSR-resistant and a BSR-susceptible genotype were colonized earlier by P. gregata in the presence than in the absence of H. glycines. Our findings indicate that H. glycines can increase the incidence and severity of BSR in soybean regardless of resistance or susceptibility to either pathogen.
Comments

This article is published as Tabor, G. M., G. L. Tylka, J. E. Behm, and C. R. Bronson. "Heterodera glycines infection increases incidence and severity of brown stem rot in both resistant and susceptible soybean." Plant disease 87, no. 6 (2003): 655-661, doi: 10.1094/PDIS.2003.87.6.655. Posted with permission.

Copyright Owner
The American Phytopathological Society
Language
en
File Format
application/pdf
Citation Information
G. M. Tabor, G. L. Tylka, J. E. Behm and C. R. Bronson. "Heterodera glycines Infection Increases Incidence and Severity of Brown Stem Rot in Both Resistant and Susceptible Soybean" Plant Disease Vol. 87 Iss. 6 (2003) p. 655 - 661
Available at: http://works.bepress.com/gregory-tylka/180/