| 【Objective】The resistance of fresh corn germplasm resources to southern corn rust was explored with
a view to provide materials and theoretical references for resistant varieties.【Method】Investigation was conducted to
analyze the resistance of different inbred lines to southern corn rust with the method of visual observation under field natural
conditions and artificial inoculation.【Result】There were significant differences between different inbred lines of fresh
corn. Under field natural conditions, only 1.11% of 710 tested inbred lines showed highly resistant level, and 8.34% of which
showed resistant level. About 77.75% of inbred lines showed middle resistant and susceptible levels, while the rest showed
highly susceptible level. After artificial inoculation, 5 inbred lines of fresh corn that highly resistant to the southern corn rust
were screened out, including three of waxy corn, one of sweet corn and one of waxy-sweet corn. Preliminary genetic analysis
of the resistant inbred line 09N1-1-1 showed that the separation ratios of F2
and BC1F1
populations were 3 ∶ 1（χ2
=2.473，
P=0.116）and 1 ∶ 1（χ2
=0.084，P=0.772）respectively, revealing the resistance of inbred line 09N1-1-1 was probably
controlled by a single dominant gene.【Conclusion】The study demonstrated that the current fresh corn resources have
high resistance to southern corn rust. Therefore, the selection and utilization of disease resistant germplasm has potential
application in variety breeding currently. |
