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Investigation of the basis behind selection of superior and inferior garlic lines from uniformly virus-infected cultivars

Nurulita, S., Geering, A., Crew, K. S., Harper, S. and Thomas, J. (2019) Investigation of the basis behind selection of superior and inferior garlic lines from uniformly virus-infected cultivars. In: Australasian Plant Pathology Society Conference APPS 2019 Strong Foundations, Future Innovations, 25-28 November 2019, Melbourne, Australia.

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Viruses infecting garlic and shallot are economically important in many countries, including Australia and Indonesia. These viruses are transmitted through planting material and by insect vectors. Infected planting material is the primary source of inoculum, as garlic and shallot are vegetatively propagated by farmers. Worldwide, garlic is infected by a complex of viruses, including potyviruses, carlaviruses and allexiviruses, and the majority have been identified on garlic in Australia. Chronically infected garlic plants show symptoms of yellow stripes, mosaic, stem lesions, and leaf deformation. The objective of this study was to investigate why inferior and superior lines of garlic can be selected and maintained from a uniformly, chronically-infected garlic crop and whether improvements are associated with the loss of one or more viruses. As an indexing tool, ten virus-specific PCR primer pairs for the main viruses infecting garlic in Australia have been developed. Field trials were conducted in two successive seasons, in which the second trial was planted with cloves that derived from either mildly or severely diseased plants in the first trial. Second-generation plants from severely diseased plants had significantly lower yields than those from mildly diseased plants. The severe-disease phenotype was highly heritable, although there were some reversions, mild to severe and severe to mild. No consistent association was found between the severity of disease symptoms and the profile of viruses but there were some instances where a virus species was lost during the vegetative propagation process. We speculate that differences in disease severity may related to differences in virus titre, which may be associated with RNAi silencing mechanisms. During the course of virus indexing, we detected garlic virus E in some plants, which is the first detection of this allexivirus in Australia.

Item Type:Conference or Workshop Item (Paper)
Business groups:Horticulture and Forestry Science
Subjects:Science > Botany > Genetics
Plant culture > Food crops
Plant culture > Field crops
Plant culture > Field crops > Root and tuber crops
Plant pests and diseases
Plant pests and diseases > Plant pathology
Live Archive:09 Dec 2019 23:52
Last Modified:11 Apr 2022 22:47

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