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Genetic Analysis of Frogeye Leaf Spot Resistance in PI54610 and Peking Soybean

Dep. of Agronomy and Soils, Auburn, AL 36849;

Jiansheng Qui and Patrick F. Pace

Dep. of Plant Pathology, Auburn, AL 36849;
DEKALB Genetics Corporation, 3100 Sycamore Road, DeKalb, IL 60115.

^* Corresponding author (dweaver{at}acesag.auburn.edu).

Frogeye leaf spot (FLS) of soybean [Glycine max (L.) Men.] is caused by the fungus Cercospora sojina Hara. The fungus is ubiquitous, but only problematic in hot humid soybean-producing regions such as Brazil, China, Nigeria, and the southern USA. Significant yield losses (10–50%) are commonly associated with FLS epidemics. The quantification of unique alleles for resistance within the southern germplasm pool is an essential step toward developing a more usable set of differential genotypes and thereby clarifying the race situation within the C. sojina-soybean interaction. Our objective was to determine the inheritance of resistance to FLS in PI54610 and Peking and their allelic relationship to Res. ‘Lee’ soybean was used as a susceptible parent for crosses and control in all experiments. Parents and F₂ seedlings were inoculated with a C. sojina spore suspension in the greenhouse or field and then rated for disease development 14 to 21 d later. On the basis of segregation ratios (3:1 resistant/susceptible in Peking x Lee and PI54610 x Lee, and 15:1 in ‘Davis’ x Peking and PI54610 x Peking), we found resistance in Peking was determined by a single dominant gene nonallelic to Rcs₃. We also found, based on nonsegregation of resistance within the Davis x PI54610 population, that PI54610 has the same gene as in Davis (Rcs₃). Resistance in Peking should be considered unique for the purpose of race differentiation and as a commercial source of resistance to FLS should Rcs₃ fail.

Received for publication August 3, 1998.

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