Campus Units
Plant Pathology and Microbiology, Agronomy
Document Type
Article
Publication Version
Published Version
Publication Date
8-2003
Journal or Book Title
Plant Disease
Volume
87
Issue
8
First Page
970
Last Page
976
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.
Copyright Owner
The American Phytopathological Society
Copyright Date
2003
Language
en
File Format
application/pdf
Recommended Citation
Tabor, G. M.; Tylka, G. L.; Cianzio, S. C.; and Bronson, C. R., "Resistance to Phialophora gregata Is Expressed in the Stems of Resistant Soybeans" (2003). Plant Pathology and Microbiology Publications. 116.
https://lib.dr.iastate.edu/plantpath_pubs/116
Included in
Agricultural Science Commons, Agriculture Commons, Agronomy and Crop Sciences Commons, Plant Breeding and Genetics Commons, Plant Pathology Commons
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.