ISHS Acta Horticulturae 860: IV International Symposium on Breeding Research on Medicinal and Aromatic Plants - ISBMAP2009
SELECTION OF BASIL (OCIMUM BASILICUM) BREEDING MATERIAL RESISTANT AGAINST DOWNY MILDEW (PERONOSPORA SP.) AND TOLERANT TO LOW TEMPERATURE |
| Authors: | P. Römer, R. Grosch, A. Kofoet, R. Djalali Farahani-Kofoet |
| Keywords: | fresh herbs, downy mildew, energy saving, "Genovese"-type basil, screening methods, conditions for pathogenesis |
| DOI: | 10.17660/ActaHortic.2010.860.21 |
| Abstract:
Downy mildew (Peronospora sp.) on basil can cause tremendous damages and financial losses in fresh herb production. Chemical control is crucial due to the risk of chemical residues in the plant matter. In a joint project between the German herb breeding company GHG Saaten GmbH and the Institute of Vegetable and Ornamental Crops (IGZ) the conditions for optimal infection with Peronospora sp. on basil have been successfully identified and resistant genotypes have been found. However, these belong to wild Ocimum species. A long term cross breeding programme is necessary to combine both downy mildew resistance and basil of the “Genovese” type which is required by the consumers. The second part of the project is the search for basil genotypes tolerant to cold temperatures. Producing at lower temperatures could save a lot of energy costs. Breeding lines and varieties of different basil types have been grown at 17°C instead of 20°C to 22°C in growth chamber. One breeding line of the “Genovese” type has been found to be tolerant against lower temperature conditions. However, this line needed about 17 days longer to reach the stage of marketability at 17°C. Recent trials at 18°C including new breeding lines revealed genotypes with similar growth compared to the check varieties grown in the warm glasshouse. | |
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