New generation maize inbred lines resistant to diplodia ear rot, caused by Stenocarpella maydis (Berk) Sutton
| Autor: | J. D. Rossouw, C. S. van Deventer, J. B.J. van Rensburg |
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| Rok vydání: | 2003 |
| Předmět: | |
| Zdroj: | South African Journal of Plant and Soil. 20:127-131 |
| ISSN: | 2167-034X 0257-1862 |
| Popis: | In an attempt to obtain superior levels of resistance to Stenocarpella maydis ear rot, three elite maize inbred lines (DO620Y, E739 and B37) from different genetic backgrounds that had previously been shown to have useful levels of resistance were crossed in all combinations. Additionally, two susceptible experimental maize populations were crossed to a resistant experimental inbred line as donor parent. Progeny in each of the five populations was selfed and selected for resistance over five successive generations, following artificial inoculation of plants at the localities Potchefstroom, Cedara and Hazyview. The five populations progressed from the S1 during 1997/98 to the S5 during 2000/01. A progressive improvement in resistance occurred over seasons in all progenies. After three cycles of selection, approximately 50% of the selections showed less than 10% infected ears, with a total of 84 selections showing no infection. Selections displaying the lowest disease incidence at any one locality were not ... |
| Databáze: | OpenAIRE |
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