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ARS Home » Midwest Area » West Lafayette, Indiana » Crop Production and Pest Control Research » Research » Publications at this Location » Publication #198056
Title: RESPONSE OF SOYBEAN ISOLINES DIFFERING IN PHYTOPHTHORA ROOT ROT RESISTANCE TO FIELD FLOODING

Author
item SHANNON, J - UNIV. MISSOSURI
item EDDY, R - UNIV. MISSOURI
item LEE, J - UNIV. MISSOURI
item SHUMWAY, C - ARKANSAS STATE UNIV.
item Abney, Thomas
item SMITH, D - PURDUE UNIV.

Submitted to: American Society of Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 8/15/2006
Publication Date: 11/12/2006
Citation: Shannon, J.G., Eddy, R.W., Lee, J.D., Shumway, C., Abney, T.S., Smith, D.A. 2006. Response of soybean isolines differing in phytophthora root rot resistance to field flooding. [abstract] American Society of Agronomy Abstracts. Abstract number not yet known.

Interpretive Summary:

Technical Abstract: Phytophthora root rot (PRR) and flooding in soybeans is often a problem on heavy clays or poorly drained soils. Phytophthora root rot (PRR) resistance could decrease losses due to flooding? Alleles for PRR resistance in soybean have been found at eight loci with some loci having more than one allele. Yields of Williams (rps), susceptible to PRR, and 13 Williams isolines differing in alleles for resistance were grown on Sharkey clay under severe flooding and under normal irrigation. Flooding reduced yield 10 bushels per acre for Williams-rps versus no flooding. Yields were also reduced for Williams Rps1-a. Rps2, Rps3-a, Rps4 Rps5, Rps6 and Rps7. On the other hand, Williams with the genes Rps1-k and Rps3-b yielded the same or higher under flooding compared to non-flood treatments, showing that PRR resistance genes can protect soybeans grown under conditions of excess water. Combinations of PRR resistance genes at different loci could provide even greater benefit. More than 50 races of Phytophthora sojae cause PRR, and different resistance genes protect against specific races. Thus, the effectiveness of PRR resistance genes under conditions of excess water will likely depend on races of the pathogen present in the field. However, because other factors are obviously involved, PRR resistance will not entirely eliminate soybean losses due to flooding.