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  • 1 Research Institute for Fodder Plants Troubsko, Ltd. 664 41 Troubsko Czech Republic
  • 2 Mendel University of Agriculture and Forestry Brno Czech Republic
  • 3 Plant Breeding and Plant Medicine Department of Crop Science 61300 Brno Czech Republic
  • 4 CEZEA — Breeding Station, JSC. 696 14 Čejč Czech Republic
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The heritability of maize resistance to one Czech isolate of Sugarcane mosaic virus (SCMV) was determined. Parental maize lines with different degree of resistance or susceptibility, their F 1 and F 2 progeny were mechanically inoculated by this virus and symptom development were observed during 63 days. The analysis of resistance of F 1 hybrids, derived from resistant lines and lines with a different degree of susceptibility, suggests that there was no hybrid found which would not exhibit any symptom of infection induced by SCMV, but the symptoms appeared one or two weeks later, compared with the susceptible line, the onset of infection was very gradual and the percentage of infection never reached 100 percent. Heritability of this trait, determined on the basis of the variances of parents, F 1 hybrids, and the development of infection in F 2 populations was relatively high and ranged from 0,70 to 0,91. From these results we can assume that the resistance of tested lines to SCMV detected in the greenhouse is not inherited completely dominantly but it may be controlled partially dominantly or polygenically.

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