The invention belongs to the technical field of corn
gene mapping, in particular to a new method for mapping a corn S-type
cytoplasm male
sterility fertility restoring
gene Rf3. According to a conventional method for mapping a qualitative character
gene, a backcross or
selfing population is constructed, the
gene type of an individual is inferred through
phenotype identification,
molecular marker detection is performed, and the position of the gene is determined through two-point and three-point tests. When the Rf3 gene is mapped with the conventional method, the
phenotype identification is affected by human and environmental factors easily, the
workload is large and the size of the
population to be mapped is limited. The mapping method aims to overcome the defects of the conventional method for mapping the Rf3 gene and does not need the
phenotype identification. The new method is characterized in that due to the fact that the
gene type of the utilized
population to be mapped is already known, the phenotype does not need to be identified, a
large population can be constructed, and enough recombined individuals can be found in one generation to fine map the Rf3 gene. The method for mapping the Rf3 gene is effective and promotes three-line
sterility seed production by the utilization of the Rf3 gene in production.