Reference Report for IND22010990
| Title: | Genetic analysis of frogeye leaf spot resistance in PI54610 and Peking soybean. |
| Authors: | Baker, W.A., Weaver, D.B., Qiu, J., Pace, P.F. |
| Source: | Crop Sci. 1999, 39(4):1021-1025 |
| Abstract: | Frogeye leaf spot (FLS) of soybean [Glycine max (L.) Merr.] 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 Rcs(3). 'Lee' soybean was used as a susceptible parent for crosses and control in all experiments. Parents and F(2) 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 Rcs(3). We also found, based on nonsegregation of resistance within the Davis x PI54610 population, that PI54610 has the same gene as in Davis (Rcs(3)). Resistance in Peking should be considered unique for the purpose of race differentiation and as a commercial source of resistance to FLS should Rcs(3) fail. |
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