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- Title
A STANDARDIZED METHOD TO EVALUATE THE RESISTANCE TO FUSARIUM OXYSPORUM f. sp. LACTUCAE IN LETTUCE.
- Authors
Sigillo, L.; Senape, V.; Serratore, G.; Bravi, R.
- Abstract
Fusarium oxysporum f. sp. lactucae (Fol) is the causal agent of fusarium wilt of lettuce. The widespread distribution of the disease is increasing especially in the fourth range productions. Three pathogen races are known but in Italy only race 1 affects cultivations. Traditional control methods are not effective and the use of resistant varieties can reduce yield losses. The characteristic "resistance to Fol" is becoming more and more important in commercial varieties. However its evaluation is not included in the official technical protocol of lettuce varieties for listing in National and European Catalogues and granting of Plant Breeders' Rights. A method to evaluate lettuce variety resistance to Fol was developed on demand of seed companies. The test is based on the dipping root inoculation method and is performed in climatic room conditions. The observation of symptoms was reported according to a disease scale and the symptoms developing on the samples were compared with those observed in reference varieties. After statistical analyses, results showed that variety behaviour vary from resistant to intermediate resistant to susceptible. Therefore, considering several experimental conditions, a standardized simple and rapid test was established. The inoculation plant stage and the choice of the reference varieties seems to be the critical control points for a reliable evaluation. Recently, the characteristic "resistance to Fol race 1" was proposed for DUS lettuce test for granting of Plant Breeders' Rights and UPOV (Union for the Protection of new Varieties of Plants) has been evaluating the analytical protocol reported in this work.
- Subjects
FUSARIUM oxysporum; LETTUCE diseases &; pests; WILT diseases; PLANT diseases; CROP yields; DISEASE resistance of plants
- Publication
Journal of Plant Pathology, 2012, Vol 94, Issue 4, pS4.80
- ISSN
1125-4653
- Publication type
Article