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Chilean Journal of Agricultural Research
Instituto de Investigaciones Agropecuarias, INIA
ISSN: 0718-5820
EISSN: 0718-5820
Vol. 79, No. 2, 2019, pp. 174-180
Bioline Code: cj19017
Full paper language: English
Document type: Research Article
Document available free of charge

Chilean Journal of Agricultural Research, Vol. 79, No. 2, 2019, pp. 174-180

 en Resistance of lettuce downy mildew’s differential cultivars to root-knot nematodes
Vidal, Roberta L.; Soares, Renato S.; Kobayashi, Bruna F.; Franco, Carolina A.; Marin, Marcus V.; Soares, Pedro L.M.; Maldonado-Junior, Walter & Braz, Leila T.

Abstract

Due to the harmful potential and existence of numerous races of lettuce downy mildew (Bremia lactuca check for this species in other resources e Regel), several countries carry out the monitoring of these races through the use of differential cultivars of lettuce ( Lactuca sativa check for this species in other resources L.) The identification of resistance to other important diseases in these cultivars would be of great value for the lettuce’s breeding, allowing the simultaneous selection for diseases. Among soil pathogens, the most important are the root-knot nematodes (Meloidogyne spp.) due their damage and difficulty of control. Thus, the present work evaluated the resistance of these differential cultivars (C-Set) against the two most important nematode species for the crop, M. javanica and M. incognita. The experiment was conducted in a completely randomized design, with eight replicates and initial population of 1000 eggs and juveniles. The evaluations were performed by the criteria of reproduction factor and reproduction index, 75 d after inoculation. Data were submitted to ANOVA and averages were compared by the Scott-Knott test (p < 0.05). All cultivars are considered susceptible to M. incognita by the reproduction factor, ߵArgelès’, ߵBedford’, ߵDesign’ and ߵGrand Rapids’ are considered as slightly resistant by the reproduction index. However, to M. javanica ߵArgelès’, ߵKibrille’, ߵBalesta’, ߵColorado’, ߵDesign’, ߵBartoli’, and ߵNunD/m15’ are classified as resistant by the reproduction factor and very resistant by the reproduction index, and can be used as resistance source for simultaneous selection to downy mildew and this species of nematode.

Keywords
Breeding; Bremia lactucae; Lactuca sativa; Meloidogyne spp.; resistance genes.

 
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