Reference Report for IND23212479
| Title: | Resistance to frogeye leaf spot in maturity groups VI and VII of soybean germplasm. |
| Authors: | Yang, W., Weaver, D.B. |
| Source: | Crop Sci. 2001, 41(2):549-552 |
| Abstract: | Frogeye leaf spot (FLS) (caused by Cercospora sojina Hara) is an important foliar disease in many soybean [Glycine max (L.) Merr.] production areas of the world. It can cause severe yield losses, but can be completely managed with genetic resistance. Three dominant genes for resistance have been reported. However, the fungus is known to be genetically variable, and in the past, new races have developed that were capable of infecting previously resistant genotypes. Finding additional sources of resistance may reduce the impact of new virulent races. The objective of this study was to evaluate all available soybean plant introductions in maturity groups VI and VII for resistance to FLS. Plants were inoculated with C-32, an isolate of C. sojina, in the greenhouse. Genotypes were rated on a scale of 0 to 6 on the basis of percent leaf area infected with lesions. Six hundred sixty (39.3%) of the accessions received a rating of 3 or lower, and were identified as resistant. Twelve accessions remained completely disease free after repeated inoculation, thus were considered highly resistant or immune. There appears to be adequate resistance to FLS within the germplasm collection, and many of these may have unique resistance genes. |
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