Natuurlijke weerbaarheid tegen meeldauw
Plant resilience is an important part of sustainable crop protection. In this project, natural resilience to powdery mildew,an economically important disease problem in greenhouse horticulture, was investigated. Plant resilience is based on morphological properties such as leaf hairs or wax layers on the leaf. In addition, plants are rich in plant compounds ,especially secondary metabolites that are involved in the defense of plants against diseases and pests. By comparing susceptible and less susceptible plants of the same species, metabolite patterns, involved in plant resilience, can be identified. Gerbera and rose were used as model crops for this research. In gerbera, 4 compounds have been found that are related to resistance to mildew in both young and old leaves: gerberin, gerberinside, parasorboside and5-hydroxyhexanolzuur. For this purpose, a total of 50 different mini and standard varieties of different origins were tested. A predictive model, based on compounds, has been created and validated. With an accuracy of 72%, it ispossible to predict the resilience of a gerbera variety to mildew on the basis of a metabolite profile. Because no chemical differences have been observed for roses, it was decided to look at morphological differences. For this purpose, the composition and strength of the wax layer of young and old leaves was investigated. The young leaves of mildew susceptible varieties showed a more extensive wax layer compared to the mildew susceptible varieties. Subsequently,tests were carried out to strengthen the wax layer of susceptible rose varieties. This has been done by means of UV-B treatments. Compared to the untreated control, which showed strong mildew infestation, the UV-B treated plants were free of mildew. The spraying with wax was also successful: spraying with 2 % beeswax (animal wax) or with 2 %carnauba wax (plant wax) led to significantly less mildew compared to the untreated control.
| Main Authors: | , , , |
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| Format: | External research report biblioteca |
| Language: | Dutch |
| Published: |
Wageningen Plant Research
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| Subjects: | Life Science, |
| Online Access: | https://research.wur.nl/en/publications/natuurlijke-weerbaarheid-tegen-meeldauw |
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| Summary: | Plant resilience is an important part of sustainable crop protection. In this project, natural resilience to powdery mildew,an economically important disease problem in greenhouse horticulture, was investigated. Plant resilience is based on morphological properties such as leaf hairs or wax layers on the leaf. In addition, plants are rich in plant compounds ,especially secondary metabolites that are involved in the defense of plants against diseases and pests. By comparing susceptible and less susceptible plants of the same species, metabolite patterns, involved in plant resilience, can be identified. Gerbera and rose were used as model crops for this research. In gerbera, 4 compounds have been found that are related to resistance to mildew in both young and old leaves: gerberin, gerberinside, parasorboside and5-hydroxyhexanolzuur. For this purpose, a total of 50 different mini and standard varieties of different origins were tested. A predictive model, based on compounds, has been created and validated. With an accuracy of 72%, it ispossible to predict the resilience of a gerbera variety to mildew on the basis of a metabolite profile. Because no chemical differences have been observed for roses, it was decided to look at morphological differences. For this purpose, the composition and strength of the wax layer of young and old leaves was investigated. The young leaves of mildew susceptible varieties showed a more extensive wax layer compared to the mildew susceptible varieties. Subsequently,tests were carried out to strengthen the wax layer of susceptible rose varieties. This has been done by means of UV-B treatments. Compared to the untreated control, which showed strong mildew infestation, the UV-B treated plants were free of mildew. The spraying with wax was also successful: spraying with 2 % beeswax (animal wax) or with 2 %carnauba wax (plant wax) led to significantly less mildew compared to the untreated control. |
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