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There are differences among soybean [Glycine max (L.) Merr.] genotypes for tolerance to water-saturated soil conditions. Phytophthora root rot caused by Phytophthora sojae (M.J. Kaufmann and J.W. Gerdemann) is problematic for soybean when the soil is excessively wet. Our objectives were (i) to determine if genotype-by-environment (G x E) interactions existed for yield between water-saturated (irrigated) vs. control (nonirrigated) environments using 37 soybean genotypes; and (ii) to determine whether resistance and/or partial resistance to P. sojae was associated with tolerance to water-saturated soil conditions. The G x E was significant between the water-saturated treatment and control. Some genotypes that yielded well under control conditions did not yield well under saturated conditions. Based on yield, we identified eight genotypes that were tolerant and eight genotypes that lacked tolerance to water-saturated soil conditions. These 16 genotypes were evaluated for resistance and partial resistance to Phytophthora using three virulence phenotypes. Those genotypes that were tolerant to water-saturated soil conditions possessed either a major gene or good partial resistance to P. sojae. We concluded that resistance to P. sojae was an important factor that increased tolerance to water-saturated soil, but that unknown other genetic factors were also important. [ABSTRACT FROM AUTHOR]

The article reports on the registration of Pembina soybean, developed by the North Dakota State University. It has resistance to lodging and race 3 and 4 of Phytophthora root and has high yield for its early maturity. It seems to contain a major allele that offers resistance to Phytophthora sojae. It serves as a replacement for cultivar Jim on field. It also has an intermediate growth habit with purple flower, gray pubescence, brown pod color, shiny seed coat and yellow hila. The soybean is generally adapted as a full-season cultivar.