Peroxidase Activity in Maize Inbred Lines Resistant or Susceptible to Maize Dwarf Mosaic Virus

Maize inbred lines, derived from both Australian and exotic sources, and used in a breeding programme at Kairi, Qld, were screened for resistance to a Johnson grass strain of sugarcane mosaic virus (SCMV-Jg). There was a good correlation between ratings made following manual inoculation in a glasshouse and those following exposure to natural field infection. Seven lines were highly resistant in both glasshouse and field ratings. A further nine lines showed an intermediate level of resistance following manual inoculation and developed from 0 to 7 % infection under field conditions when a susceptible line developed 99 % infection. Data obtained following the manual inoculation of plants in segregating generations of crosses between resistant KL 57 and susceptible KL 9 were consistent with resistance being controlled by a single dominant gene. Six lines (Pa 405, CI 44, Tx 601, Oh 07, Oh 7B, 38-11) that were used as sources of resistance to maize dwarf mosaic virus, strain A (MDMV-A) in the U.S.A. developed natural infection levels of less than 15% with SCMV-Jg. Only Pa 405 was highly resistant to manual inoculation. Four of 11 SCMV-Jg resistant lines were also highly resistant to manual inoculations with the sugarcane, Sabi grass and Queensland blue couch grass strains.

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Genetics of Reaction to Maize Dwarf Mosaic Virus Strain A in Several Maize Inbred Lines

Phytopathology ◽

10.1094/phyto-79-1364 ◽

1989 ◽

Vol 79 (12) ◽

pp. 1364 ◽

Cited By ~ 7

Author(s):

C. W. Roane

Keyword(s):

Mosaic Virus ◽

Virus Strain ◽

Inbred Lines ◽

Maize Dwarf Mosaic Virus ◽

Maize Inbred Lines

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Determination of the Number of Genes for Resistance to Maize Dwarf Mosaic Virus Strain A in Five Corn Inbred Lines

Phytopathology ◽

10.1094/phyto-74-71 ◽

1984 ◽

Vol 74 (1) ◽

pp. 71 ◽

Cited By ~ 17

Author(s):

Eugen Rosenkranz

Keyword(s):

Mosaic Virus ◽

Virus Strain ◽

Inbred Lines ◽

Maize Dwarf Mosaic Virus ◽

Number Of Genes ◽

Corn Inbred

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The Mdm1 Locus and Maize Resistance to Maize dwarf mosaic virus

Plant Disease ◽

10.1094/pdis-91-2-0185 ◽

2007 ◽

Vol 91 (2) ◽

pp. 185-190 ◽

Cited By ~ 28

Author(s):

M. W. Jones ◽

M. G. Redinbaugh ◽

R. Louie

Keyword(s):

Mosaic Virus ◽

Fragment Length Polymorphism ◽

Bulked Segregant Analysis ◽

Inbred Lines ◽

Maize Dwarf Mosaic Virus ◽

Resistant Parent ◽

Resistant Lines ◽

The Family ◽

Maize Resistance ◽

Symptom Type

Previously, Mdm1, a gene controlling resistance to Maize dwarf mosaic virus (MDMV), was identified in the inbred line Pa405. The gene was tightly linked to the restriction fragment length polymorphism marker umc85 on the short arm of chromosome 6. This chromosomal region is also the location of resistance genes to two other viruses in the family Potyviridae, Sugarcane mosaic virus (SCMV) and Wheat streak mosaic virus (WSMV). A diverse collection of 115 maize inbred lines was evaluated for resistance to MDMV and SCMV, and for MDMV resistance loci on chromosome 6S. Forty-six resistant inbred lines were crossed to three MDMVsusceptible inbred lines to develop F2 populations. The F2 populations were inoculated with MDMV and scored for infection and symptom type. Environmental factors influenced both the rate and type of symptom development. Bulked segregant analysis of each F2 population indicated that, in 42 of 43 MDMV-resistant lines, chromosome 6S markers found in the resistant parent also were present in the bulked resistant but not the susceptible tissue. Markers previously associated with resistance to both SCMV and WSMV on chromosome 3 and to WSMV on chromosome 10 were associated with resistance in nine and seven of the F2 populations, respectively. These data suggest that Mdm1 or closely linked genes on chromosome 6S are associated with MDMV resistance in most germplasm, but that other loci also may affect resistance.

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Genetic Variability Among Maize Inbred Lines for Resistance to the High Plains Virus-Wheat Streak Mosaic Virus Complex

Plant Disease ◽

10.1094/pdis.1997.81.2.195 ◽

1997 ◽

Vol 81 (2) ◽

pp. 195-198 ◽

Cited By ~ 13

Author(s):

A. Marçon ◽

S. M. Kaeppler ◽

S. G. Jensen

Keyword(s):

Genetic Variability ◽

Mosaic Virus ◽

Mixed Infection ◽

Severe Disease ◽

Virus Titer ◽

Inbred Lines ◽

Wheat Streak Mosaic Virus ◽

Enzyme Linked Immunosorbent Assay ◽

High Plains ◽

Maize Inbred Lines

High plains virus (HPV) is a pathogen that causes a severe disease, especially in susceptible corn genotypes. The virus is transmitted by the eriophyid mite Aceria tosichella, which also transmits wheat streak mosaic virus (WSMV). This often results in a mixed infection by these two viruses. Genetic variability for resistance to the HPV exists among maize inbred lines but has not been characterized. The disease reaction of 30 maize inbred lines to the mixed infection and to WSMV alone was characterized in this study. Evaluation was based on symptom expression and virus titer (HPV and WSMV), as measured by enzyme-linked immunosorbent assay. All lines showed some HPV symptoms, which ranged from a few visible spots to rapid plant death. HPV-resistant inbreds include B73 and B14. Susceptible inbreds include W64A, Wf9, H100, N213, N215, and N194. Five of the six inbreds most severely affected by HPV also had a high WSMV titer, although they displayed few symptoms when inoculated with WSMV alone. Inbred N194 was one of the genotypes most susceptible to HPV, but it showed no detectable WSMV titer. Seedlings of highly susceptible genotypes often died within 2 weeks of infection.

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