Analyses of Interactions Between Soybean and Phialophora Gregata

Resistance to the fungal pathogen, Phialophora gregata (Allington and Chamberlain) W. Gams, the cause of brown stem rot (BSR) in soybean (Glycine max (L.) Merr.), is critical to prevent yield losses in the northern USA. The objective of the first phase of this study was to determine the effect of P. gregata source on aggressiveness and physiologic specialization. Isolates were derived after two cycles of infection from four host cultivars in ten sites. Out of twenty-seven isolates, two were virulent on PI 437833. BSR 201 was resistant to all isolates. Isolates derived from BSR 201 had lower aggressiveness. The data showed a high level of variability for aggressiveness and the first report of physiologic specialization in P. gregata.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Agronomy

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2014

Author dc:creator

• Willmot, David Brett

Contributors dc:contributor

• Nickell, Cecil D.

• Agriculture, Agronomy

Identifier

(UMI)AAI8823291

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/71655