Natural and Mass Selection Estimates of Relative Fitness for the Soybean rps Gene1
- R. I. Buzzell and
- Jerry H. Haas2
Relative-fitness estimates were obtained for the rps gene that controls susceptibility to phytophthora rot in the soybean [Glycine max (L.) Merr.] Composites of resistant and susceptible varieties carrying phenotypic markers were used. With natural selection under epiphytotic conditions, rpsrps was 75% as reproductive as RpsRps in 2 years and only 35% as reproductive in another year. Mass selection through sieving for larger seed further reduced the relative fitness of rpsrps. The estimates were applied to a theoretical bulk-hybrid population segregating for Rps and rps to show the probable effects of natural and mass selection in increasing the proportion of resistant plants.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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