Abstract
Some plants of corn (Zea mays L.) inbreds resistant to maize dwarf mosaic virus (MDMV) develop symptoms when mechanically inoculated with the virus in the field. The objective of this study was to determine if variability for occurrence of maize dwarf mosaic (MDM) symptoms among plants of resistant inbreds could be attributed to genetic variability within that inbred. Eight plants with and eight without MDM symptoms in each of three inbreds (Tx601, Mo18W, and T220A) were self‐pollinated and the progenies from symptomless plants were compared with progenies from diseased plants for their reaction to inoculation with MDMV. Comparisons were made in three field tests and one greenhouse test. In the four environments, the average incidences of plants with MDM symptoms were 5, 12, 2, and 68% for the progenies from symptomless plants and 5, 12, 3, and 71% for progenies from diseased plants. Thus, whether plants of these three resistant inbreds develop symptoms or remain symptomless is not conditioned by genetic variability within the inbred.
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