Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 27:78-79 (1987)
© 1987 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Variable Reaction within Corn Inbreds to Maize Dwarf Mosaic Virus not Genetically Controlled1

Gene E. Scott and Eugen Rosenkranz2

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.

Key Words: Maize • Zea mays L. • Plant resistance • Disease genetic variability

1 Contribution from the Crop Science Research Lab., Mid-South Area, USDA-ARS and the Mississippi Agric. and Forestry Exp. Stn., Mississippi State, MS 39762. Published as Journal Paper no. 6173.

2 Research agronomist, USDA-ARS and professor of agronomy, Mississippi State University and research plant pathologist, USDA-ARS and professor of plant pathology, Mississippi State University, respectively.

Received for publication February 10, 1986.




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