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Somaclonal selection in potato for resistance to common scab provides concurrent resistance to powdery scab
Citation
Tegg, RS and Thangavel, T and Aminian, H and Wilson, CR, Somaclonal selection in potato for resistance to common scab provides concurrent resistance to powdery scab, Plant Pathology, 62, (4) pp. 922-931. ISSN 0032-0862 (2012) [Refereed Article]
Copyright Statement
Copyright 2012 The Authors Plant Pathology & BSPP
DOI: doi:10.1111/j.1365-3059.2012.02698.x
Abstract
Variant somaclones of potato cultivar Russet Burbank, selected for resistance to common scab using in vitro cell selection techniques, were tested for resistance to powdery scab, another important disease of potato caused by Spongospora subterranea. This pathogen also invades roots, producing root galls. Most variants consistently showed increased resistance to powdery scab, both in field and glasshouse challenge, when compared to the parental cultivar, several significantly so. On average, the best variant reduced powdery scab incidence by 51% and severity (tuber surface coverage) by 64%. In contrast, no improvement in the extent of root infection and root galling was seen. These results suggest host interactions during root and tuber infection are distinct. Correlation analyses of disease indices amongst the selected variants showed no association between Sp. subterranea root infection and gall scores, nor between root infection and tuber disease severity. However, a weak positive association was found between root gall score and tuber disease, and a strong correlation between tuber disease incidence and severity scores. Interestingly, positive correlations were also found between the extent of powdery and common scab resistance expressed and both incidence and severity of these diseases within the variants, suggesting a common defence mechanism. The role of thaxtomin A in selecting for concurrent resistance to both diseases is discussed.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Keywords: | root disease, Russet Burbank, Spongospora subterranea, tuber disease |
| Research Division: | Agricultural and Veterinary Sciences |
| Research Group: | Horticultural Production |
| Research Field: | Horticultural Crop Protection (Pests, Diseases and Weeds) |
| Objective Division: | Plant Production and Plant Primary Products |
| Objective Group: | Horticultural Crops |
| Objective Field: | Vegetables |
| Author: | Tegg, RS (Dr Robert Tegg) |
| Author: | Thangavel, T (Dr Tamil Thangavel) |
| Author: | Wilson, CR (Associate Professor Calum Wilson) |
| ID Code: | 79824 |
| Year Published: | 2012 |
| Deposited By: | Agricultural Science |
| Deposited On: | 2012-10-04 |
| Last Modified: | 2015-06-25 |
| Downloads: | 1 View Download Statistics |
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