Reduction of disease incidence in small field plots by isolate-specific resistance to barley yellow dwarf virus

Gray, S. M. and Smith, D. and Sorrells, M. (1994) Reduction of disease incidence in small field plots by isolate-specific resistance to barley yellow dwarf virus. Phytopathology, 84 (7). pp. 713-718.

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Epidemics of 2 isolates, RMV and MAV, of barley yellow dwarf luteovirus (BYDV) were studied in 3 spring oat genotypes in Ithaca, New York, USA. Two of the genotypes were previously found to possess varying levels of resistance expressed as a reduction in the accumulation of virus antigen titre in plants. The reduced virus antigen titre contributed to reduced virus acquisition and transmission efficiencies by aphid vectors. The third genotype was susceptible to the 2 BYDV isolates. Resistance was expressed at high levels against the RMV isolate; and in 1990 and 1991, the final disease incidence of RMV and rate of disease progress were significantly reduced in the resistant genotypes relative to the susceptible genotype. The resistance reduced both rate of disease progress and final disease incidence of the MAV isolate during both years of study. The magnitude of the reduction in final MAV incidence relative to the susceptible genotype varied between the 2 years and could be related to vector population intensity and environmental factors. It is suggested that resistance expressed as reduced or suppressed virus accumulation in plants can be easily identified by serological or nucleic acid-based assays. The lower virus titre may reduce disease impact on plant growth and can reduce the efficiency with which aphid vectors acquire and transmit virus among resistant plants.

Item Type: Article
Additional Information: Dr S N Nigam research collection - Box No:17
Uncontrolled Keywords: Reduction of disease, Small field plots, Barley yellow dwarf virus
Author Affiliation: USDA, ARS, Department of Plant Pathology, Cornell University, Ithaca, USA.
Subjects: Crop Improvement
Divisions: Other Crops
Depositing User: Mr Arbind Seth
Date Deposited: 29 Mar 2013 06:09
Last Modified: 29 Mar 2013 06:09
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