Reference Report for CAIN759050391
| Title: | Inheritance of reaction to race 4 of soybean-cyst nematode [Heterodera glycines] |
| Authors: | Thomas, J.D., Caviness, C.E., Riggs, R.D., Hartwig, E.E. |
| Source: | Crop Sci. 1975, 15(2):208-210. |
| Abstract: | Five soybean (Glycine max L. Merr.) crosses involving parents that differed in reaction to race 4 of soybean-cyst nematode (SCN) (Heterodera glycines Ichinohe) were studied in F1, F2, and backcross populations. Reaction of the parents to race 4 was: PI 88788, resistant; PI 90763, moderately resistant; ‘Peking,’ susceptible; ‘Mack’ and ‘Hill,’ very susceptible. Frequency distributions from three crosses involving parents that were resistant, moderately resistant, and susceptible indicated that three alleles at a single locus conditioned reaction to SCN. Resistance possessed by PI 88788 was recessive to PI 90763 and the moderately resistant reaction of PI 90763 was recessive to the susceptible Peking cultivar. Backcross data also appeared to confirm this inheritance pattern. Segregation in the F2 generation gave a good fit for a ratio of three resistant and 61 susceptible plants from two crosses; Hill PI 90763 and Mack PI 90763 which involved very susceptible and moderately resistant parents. This ratio indicated one dominant and two recessive genes conditioned resistance in these crosses. Apparently two additional loci with two alleles at each locus, also are necessary for resistance to race 4. |
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