Quantification of Yield Loss Caused by Triticum mosaic virus and Wheat streak mosaic virus in Winter Wheat Under Field Conditions

Plant Disease - Tập 98 Số 1 - Trang 127-133 - 2014
Emmanuel Byamukama1, Stephen N. Wegulo1, T. Satyanarayana2, Gary L. Hein3, Shawn M. Kaeppler4, P. Stephen Baenziger5, Ron French2
1Department of Plant Pathology, University of Nebraska-Lincoln, Lincoln, NE 68583
2USDA-ARS and Department of Plant Pathology, University of Nebraska-Lincoln
3Department of Entomology, University of Nebraska-Lincoln
4USDA-ARS and Department of Agronomy and Horticulture, University of Nebraska-Lincoln
5Department of Agronomy and Horticulture, University of Nebraska-Lincoln

Tóm tắt

Triticum mosaic virus (TriMV) and Wheat streak mosaic virus (WSMV) infect winter wheat (Triticum aestivum) in the Great Plains region of the United States. The two viruses are transmitted by wheat curl mites (Aceria tosichella), which also transmit High Plains virus. In a field study conducted in 2011 and 2012, winter wheat cultivars Millennium (WSMV-susceptible) and Mace (WSMV-resistant) were mechanically inoculated with TriMV, WSMV, TriMV+WSMV, or sterile water at the two-leaf growth stage. Chlorophyll meter (soil plant analysis development [SPAD]) readings, area under the SPAD progress curve (AUSPC), grain yield (=yield), yield components (spikes/m2, kernels/spike, 1,000-kernel weight), and aerial dry matter were determined. In Millennium, all measured variables were significantly reduced by single or double virus inoculation, with the greatest reductions occurring in the double-inoculated treatment. Among the yield components, the greatest reductions occurred in spikes/m2. In Mace, only AUSPC was significantly reduced by the TriMV+WSMV treatment in 2012. There was a significant (P ≤ 0.05), negative linear relationship between SPAD readings and day of year in all inoculation treatments in Millennium and in the TriMV+WSMV treatment in Mace. There were significant (P ≤ 0.05), positive linear relationships between yield and SPAD readings and between yield and aerial dry matter in Millennium but not in Mace. The results from this study indicate that under field conditions, (i) Mace, a WSMV-resistant cultivar, is also resistant to TriMV, and (ii) double inoculation of winter wheat by TriMV and WSMV exacerbates symptom expression and yield loss in a susceptible cultivar.

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Tài liệu tham khảo

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Plant Disease

Tập 98 Số 1

127-133

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