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ARS Home » Midwest Area » West Lafayette, Indiana » Crop Production and Pest Control Research » Research » Publications at this Location » Publication #132252
Title: COMPARISON OF SOYBEAN DIFFERENTIAL REACTIONS FOLLOWING INOCULATION WITH FOUR RACES OF PHYTOPHTHORA SOJAE FROM OHIO AND INDIANA

Author
item JIA, H - OHIO STATE UNIVERSITY
item DORRANCE, A - OHIO STATE UNIVERSITY
item RICHARDS, THOMAS
item ABNEY, THOMAS

Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: 3/21/2002
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Hypocotyl inoculation is commonly used to determine races or pathotypes of Phytophthora sojae isolates and to identify Rps genes. Differences in reactions for isolates have been reported. This may be due to changes in virulence in the pathogen or to different sources of resistance in a differential. Isolates of P. sojae representing races 1, 3, 4, 7 and 25 from IN and OH were compared on soybean differentials from three separate seed sources. Races 1, 3, 4, 7, and 25 had the expected reaction on all differentials for Rps1b, Rps1c, Rps1k, Rps2, Rps3a, Rps4, Rps5, and Rps7 butt nor for all cultivars used as Rps1a and Rps1d differentials. Differentials L88-8470 for Rps1a and L93-3302 for Rps1d did not have the expected response. Additional races are needed to differentiate reactions on Rpa3b, Rps3c, and Rps6. Utilizing different sources of resistance for Rps alleles may account for some of the differences in reactions of P. sojae isolates.