Comparison of disease resistance of maize varieties from the 1950s to the 2000s in China


The objective of this investigation was to analyze trends in diseases resistance along with genetic gain. Experimental materials consisted of maize varieties selected from each decade beginning with the 1950s. These varieties were evaluated for resistance to maize dwarf mosaic virus (MDMV), maize rough dwarf virus (MRDV), common smut disease (CSD) and head smut disease (HSD) in several different locations. Artificial inoculation was adopted for infection with MDMV and HSD, whereas natural infection was used for infection MRDV and CSD. Results indicated that resistance of the newer varieties to MDMV, CSD, and HSD was greater than that of older varieties, but the correlation to decades was not significant. To date, no variety tested in China has shown resistance to MRDV, which is likely due to a lack of maize germplasm resources resistant to MRDV in China. So the next goal will be to import new germplasm resources and select resistant germplasm as the basis of breeding resistant varieties.


maize (Zea mays L); variety; disease resistance; era

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