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.

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

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