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Identification of resistance to Maize rayado fino virus in maize inbred lines
- JOSE Luis ZAMBRANO, DAVID M. FRANCIS, MARGARET G. REDINBAUGH
- Plant disease 2013 v.97 no.11 pp. 1418-1423
- Dalbulus maidis, Maize rayado fino virus, Zea mays, corn, cultivars, disease incidence, disease resistance, disease transmission, dominance (genetics), gene segregation, genes, genotype, inbred lines, insect vectors, landraces, plant breeding, viruses
- Maize rayado fino virus (MRFV) is one of the most important virus diseases of maize in America. Severe yield losses, ranging from 10 to 50% in landraces to nearly 100% in contemporary cultivars, have been reported. Resistance has been reported in populations, but few inbred lines have been identified with resistance. Maize inbred lines representing the range of diversity in the cultivated types and selected lines known to be resistant to other viruses were evaluated to identify novel sources of resistance to MRFV. Virus was transmitted using the vector Dalbulus maidis, and disease incidence and severity were evaluated beginning seven days post inoculation. Most of the 36 lines tested were susceptible to MRFV, with mean disease incidence ranging from 21 to 96%, and severity from 1.0 to 4.3 (using a 0 to 5 severity scale). A few genotypes, including CML333 and Ki11, showed intermediate levels of resistance, with 14% and 10% incidence, respectively. Novel sources of resistance, with incidence of less than 5% and severity ratings of 0.4 or less, included the inbred lines Oh1VI, CML287, and Cuba. Resistance carried by Oh1VI was dominant, and F2 segregation was consistent with one or two resistance genes. The discovery of novel sources of resistance in maize inbred lines will facilitate the identification of virus resistance genes and their incorporation into breeding programs.