Comparative root colonisation of strawberry cultivars Camarosa and Festival by Fusarium oxysporum f. sp. fragariae |
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Authors: | Xiangling Fang John Kuo Ming Pei You Patrick M. Finnegan Martin John Barbetti |
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Affiliation: | 1. School of Plant Biology, Faculty of Natural Agricultural Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia 2. The Centre for Microscopy, Characterisation and Analysis, The University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia 3. The UWA Institute of Agriculture, Faculty of Natural Agricultural Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia
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Abstract: | Background and aims Strawberry (Fragaria x ananassa) is a high-value crop worldwide. Fusarium oxysporum f. sp. fragariae causes rapid wilting and death of strawberry plants and severe economic losses worldwide. To date, no studies have been conducted to determine colonisation of either susceptible or resistant strawberry plants by F. oxysporum f. sp. fragariae, or whether plant colonisation by F. oxysporum f. sp. fragariae differs between susceptible and resistant cultivars. Methods Colonisation of strawberry plants by a pathogenic isolate of F. oxysporum f. sp. fragariae was examined both on the root surface and within root tissue of one resistant cv. Festival and one susceptible cv. Camarosa using light and scanning electron microscopy from 4?h to 7?d post inoculation (pi). Results Resistant cv. Festival significantly impeded the spore germination and penetration from 4 to 12 hpi and subsequent growth and colonisation by this pathogen until 7 dpi compared with susceptible cv. Camarosa. At 7 dpi, fungal colonisation in resistant cv. Festival remained mainly confined to the epidermal layer of the root, while in susceptible cv. Camarosa, hyphae not only had heavily colonised the cortical tissue throughout but had also colonised vascular tissues. Conclusions This study demonstrates for the first time that resistance of a strawberry cultivar to F. oxysporum f. sp. fragariae is a result of impedance of pathogen growth and colonisation both on the plant surface and within host tissues. Resistance mechanisms identified in this study will be of high value for breeding programmes in developing new disease-resistant cultivars to manage this serious strawberry disorder. |
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