Chávez-Medina, J.A. and Leyva-López, N.E. and Pataky, J.K. (2007) Resistance to puccinia polysora in maize accessions. Plant Disease, 91 (11). pp. 1489-1495.
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Abstract
A number of potential sources of general and specific resistance to southern corn rust were identified from 1,890 plant introduction accessions that were screened for reactions to Puccinia polysora race 9. Resistance appeared to differ among four accessions on which uredinia were not observed in initial screenings. Resistance to P. polysora in PI 186215 (Argentine inbred 2-687) was a chlorotic fleck, hypersensitive reaction that was conditioned by a single, dominant gene that was allelic with or very closely linked to the Rpp9 gene based on tests of allelism. All but 3 of 2,357 testcross progeny, (inbred 2-687 × Rpp9) × PS were resistant. Resistance in Ames 19016 (Va59) was effective in F1 progeny and appeared to be dominant and simply inherited; however, this resistance appeared to be a slow-rusting or incomplete resistance that was effective in adult plants but not in young seedlings. Severity of southern rust was less than 10% on resistant progeny from crosses with Va59 compared with severity exceeding 70% on susceptible progeny. Resistance in plant introduction (PI) 186209 (Venezuelan flint) and NSL 75976 (IA DS61) were not effective in F1 hybrid combination and, thus, probably have limited value in commercial maize. Resistance in PI 186209 may be conditioned by a single recessive gene and resistance in NSL 75976 may be co-dominant.
| Item Type: | Article |
|---|---|
| Author Affiliation: | Departamento de Agropecuario, Centro Interdisciplinario de Investigación para el Desarrollo Integral Regional-IPN, Unidad Sinaloa, Guasave, Sinaloa, Mexico |
| Subjects: | Plant Protection |
| Divisions: | Maize |
| Depositing User: | David T |
| Date Deposited: | 07 Feb 2011 15:51 |
| Last Modified: | 07 Feb 2011 15:51 |
| Official URL: | http://apsjournals.apsnet.org/doi/pdf/10.1094/PDIS... |
| URI: | http://eprints.icrisat.ac.in/id/eprint/1477 |
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