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- Dey, Estera, et al.
(författare)
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Alkylresorcinols isolated from rye bran by supercritical fluid of carbon dioxide and suspended in a food-grade emulsion show activity against Penicillium expansum on apples
- 2013
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Ingår i: Archives of Phytopathology and Plant Protection. - : Informa UK Limited. - 1477-2906 .- 0323-5408. ; 46:1, s. 105-119
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Tidskriftsartikel (refereegranskat)abstract
- Apple cultivars are attacked by many fungal diseases, both on the tree and during storage. One of the most serious is blue mould, caused by Penicillium expansum. In this study, 5-(n)-alkylresorcinols (AR) were isolated from rye bran by the supercritical fluid of carbon dioxide and were used for the preparation of bioactive emulsions. These emulsions were applied to harvested fruit of five apple varieties to determine the levels of antifungal activity. A significant inhibition of disease symptoms was obtained after spraying some of the prepared AR emulsions on fruits that had been experimentally infected with Penicillium expansum. The most effective emulsions consisted of 0.025% (m/v) ARs, 0.1% (m/v) xanthan gum, 0.5% (m/v) Synperonic 91/6 or PDMs-copolymer, 0.2% (m/v) Tween 20, 1% (m/v) Trioleate, 2% (m/v) oleylalcohol, 2% (m/v) PEG 400, 5% (m/v) CaCl2 or NaCl suspended in water.
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- Gustavsson, Larisa, et al.
(författare)
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Do we preserve unique apple germplasm?
- 2011
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Ingår i: Acta Horticulturae. - 0567-7572 .- 2406-6168. ; 918, s. 661-666
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Konferensbidrag (refereegranskat)
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- Gustavsson, Larisa, et al.
(författare)
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Screening of Apple Cultivars for Resistance to European Canker, Neonectria ditissima
- 2013
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Ingår i: Acta Horticulturae. - 0567-7572 .- 2406-6168. ; 976, s. 529-536
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Konferensbidrag (refereegranskat)abstract
- European canker, caused by the fungus Neonectria ditissima, is a severe problem in apple production both in Sweden and in many other northern European countries. Even when applying fungicides and good horticultural practices, canker damage occurs almost yearly in nurseries and orchards. Some years, devastating outbreaks destroy numerous trees. To date, complete resistance to N. ditissima is not known in apple. For further research and plant breeding, heritable variation in quantitative resistance should be investigated by phenotyping large sets of cultivars. In the present project, 55 apple cultivars were screened for resistance to N. ditissima. One-year-old shoots from mature trees were inoculated in the greenhouse with a standardized volume and concentration of conidia suspension using different inoculation methods. Two-year-old trees of five cultivars were inoculated in the field. Length of the occurring cankers was measured at regular intervals throughout a period of up to three months. The investigated cultivars showed considerable differences in colonization rate. In cultivars known to be highly resistant, i.e., 'Santana', lesions progressed much slower compared to susceptible cultivars like 'Cox's Orange Pippin' and 'James Grieve'. Since the inoculation-based phenotyping is demanding in labour and time (duration), especially when the test is performed on grafted trees, qPCR-based assessment of fungal biomass at early stages of infection was explored as an alternative or complementary approach for phenotyping.
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- Gustavsson, Larisa, et al.
(författare)
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Varför äpplen på banken?
- 2011
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Ingår i: Pomologen. - 1650-9455. ; 11, s. 10-15
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Tidskriftsartikel (populärvet., debatt m.m.)
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