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Field evaluation of tolerance to Tobacco streak virus in sunflower germplasm, and observations of seasonal disease spread

Sharman, M. and Pagendam, D. E. and Persley, D. M. and Drenth, A. and Thomas, J. E. (2016) Field evaluation of tolerance to Tobacco streak virus in sunflower germplasm, and observations of seasonal disease spread. Annals of Applied Biology, 168 (3). pp. 390-399.

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Article Link(s): http://dx.doi.org/10.1111/aab.12270

Abstract

Strong statistical evidence was found for differences in tolerance to natural infections of Tobacco streak virus (TSV) in sunflower hybrids. Data from 470 plots involving 23 different sunflower hybrids tested in multiple trials over 5 years in Australia were analysed. Using a Bayesian Hierarchical Logistic Regression model for analysis provided: (i) a rigorous method for investigating the relative effects of hybrid, seasonal rainfall and proximity to inoculum source on the incidence of severe TSV disease; (ii) a natural method for estimating the probability distributions of disease incidence in different hybrids under historical rainfall conditions; and (iii) a method for undertaking all pairwise comparisons of disease incidence between hybrids whilst controlling the familywise error rate without any drastic reduction in statistical power. The tolerance identified in field trials was effective against the main TSV strain associated with disease outbreaks, TSV-parthenium. Glasshouse tests indicate this tolerance to also be effective against the other TSV strain found in central Queensland, TSV-crownbeard. The use of tolerant germplasm is critical to minimise the risk of TSV epidemics in sunflower in this region. We found strong statistical evidence that rainfall during the early growing months of March and April had a negative effect on the incidence of severe infection with greatly reduced disease incidence in years that had high rainfall during this period.

Item Type:Article
Business groups:Crop and Food Science
Subjects:Plant culture > Flowers and flower culture. Ornamental plants
Plant pests and diseases
Plant pests and diseases > Plant pathology
Deposited On:09 Feb 2016 00:52
Last Modified:20 Jul 2016 06:11

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