Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 26:665-667 (1986)
© 1986 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Relationship between Greenhouse and Field Ratings for Brown Stem Rot Reaction in Soybean1

S. A. Sebastian, C. D. Nickell and L. E. Gray2

To justify greenhouse selection for disease resistance, greenhouse disease reactions should be indicative of disease reactions under field conditions. Field and greenhouse tests were conducted to determine the relationship between field and greenhouse reactions of soybean [Glycine max (L.) Merr.] lines to Phialophora gregata (Allington and Chamberlain) W. Gams, the muse of brown stem rot (BSR). Twenty-five soybean lines of Maturity Group 111 and 20 soybean lines of Maturity Group IV were rated for BSR reaction in field and greenhouse tests. The BSR ratings included counts of nodes showing leaf and stem symptoms in both field plots and greenhouse pots. Visual estimates of leaf symptom incidence in field plots were also recorded. Greenhouse leaf symptoms were highly correlated with the reactions of soybean lines under field conditions where susceptible standards showed obvious leaf symptoms. Selection based on greenhouse leaf symptoms identified soybean lines with field resistance to BSR. Resistance was associated with a 12 to 16% yield advantage when disease developed to the point of causing leaf symptoms in susceptible soybean lines.

Key Words: Phialophora gregata • Glycine max (L.) Merr. • Disease resistance • Disease screening • Soybean breeding • Yield

1 Contribution from Dep. of Agronomy, USDA-ARS, and Dep. of Plant Pathology, Univ. of Illinois at Urbana-Champaign, IL 61801. Research supported in part by Illinois Soybean Program Operating Board and Illinois Crop Improvement Association. This research was from a thesis by the senior author in partial fulfillment of requirements for the Ph.D. degree at the Univ. of Illinois at Urbana-Champaign

2 Former graduate research assistant, professor of plant genetics, Dep. of Agronomy, and research plant pathologist, USDA-ARS, Dep. of Plant Pathology, Univ. of Illinois at Urbana-Champaign, IL 61801.

Received for publication May 20, 1985.




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Environmental Quality		 The Plant Genome
Copyright © 1986 by the Crop Science Society of America.