ARS | Publication request: THE EFFECT OF RBS2 ON YIELD OF SOYBEAN

Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: July 21, 1996
Publication Date: N/A

Technical Abstract: Brown stem rot, caused by Phialophora gregata, is a vascular/foliar soybean disease of the north central United States. Although yield comparisons have been made between susceptible and resistant lines at infested and noninfested sites, none have evaluated the advantage associated with resistance. In this study, five pairs of near-isogeneic lines for the Rbs2 resistance gene were grown at six locations in Illinois in 1994, relying on natural infection of the disease. Lines were evaluated for disease incidence (% of infected plants) and severity (degree of infection) in late August and harvested in September. At four locations with greater than 20% incidence of brown stem rot, a 10.1% yield advantage was associated with the Rbs2 resistance gene. At two locations with less than 2% incidence of brown stem rot, a 1.5% yield advantage was associated with the Rbs2 resistance gene.