A Population of <i>Meloidogyne javanica</i> in Spain Virulent to the <i>Mi</i> Resistance Gene in Tomato

Ornat, C.; Verdejo-Lucas, Soledad; Sorribas, Francisco Javier

doi:10.1094/pdis.2001.85.3.271

Cited by 77 publications

(64 citation statements)

References 6 publications

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“…However, root gall index is not a satisfactory indicator of the durability of root-knot nematode resistance (Hussey and Boerma, 1981;Reed and Schneider, 1992;Zhou et al, 2000). Whereas the parameters viz., number of females, number of egg masses and number of eggs per gram of root recorded in tomato genotypes are the better indicators of nematode reproduction than root gall index (Ornat et al, 2001). …”

Section: Resultsmentioning

confidence: 99%

Screening of Tomato Genotypes for Root Knot Nematode (Meloidogyne incognita Kofoid and White Chitwood)

Vethamoni¹,

Sivakumar²

2017

Int.J.Curr.Microbiol.App.Sci

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Section: Resultsmentioning

confidence: 99%

Screening of Tomato Genotypes for Root Knot Nematode (Meloidogyne incognita Kofoid and White Chitwood)

Vethamoni¹,

Sivakumar²

2017

Int.J.Curr.Microbiol.App.Sci

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“…Rossol as on susceptible cv. Easypeel suggests an incomplete virulence of the nematode or that the resistant cultivar retain some of their capability to limit nematode development and reproduction (Ornat et al 2001). At 33.6±1.2°C, the plants of tomato cv.…”

Section: Discussionmentioning

confidence: 99%

Host status of cultivated plants to Meloidogyne hispanica

et al. 2011

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The reproduction of a Meloidogyne hispanica isolate from Portugal was evaluated in 63 plant species/cultivars, in pot assays at 25±2.0°C, on the basis of root gall index (GI) and reproduction factor (Rf0final/initial egg density) at 60 days after inoculation. Cultivars of aubergine, bean, beetroot, broccoli, carnation, corn, cucumber, French garlic, lettuce, melon, onion, parsley, pea, potato, spinach, and tobacco and two of cabbage were susceptible (3≤GI≤5; 1.15≤ Rf≤262.86). Cabbage cv. Bacalan, cauliflower cv. Temporão and pepper cv. Zafiro R2 were hypersusceptible or poor hosts (Rf<1; GI>2) and pepper cvs. Aurelio and Solero were resistant (0.0 ≤ GI ≤ 0.4; 0.00≤Rf≤0.03). The response of the pepper cultivars and the Mi-1 resistant tomato cv. Rossol was also conducted in pots using two inoculum levels and four temperatures, three growth chamber (25±2.7°C, 29.3±1.8°C and 33.6±1.2°C) and one outdoors (24.4±8.2°C). At 24.4±8.2°C and 25±2.7°C, the reproduction on the resistant tomato was significantly lower compared to the susceptible cv. Easypeel. At all temperatures, resistance was evident for the pepper cultivars, despite the fact they were not found to contain any of the Me1, Me3, Me7 and N genes. The eggs obtained on cv. Aurelio at 33.6± 1.2°C were used to get a selected resistance breaking isolate of M. hispanica that was able to reproduce on the three pepper cultivars. Our results suggest that the initial M. hispanica isolate is a mixture of virulent and avirulent individuals. The pepper cultivars tested, have potential to reduce M. hispanica populations in agro-ecosystems under certain conditions, but they should be used as a part of an integrated management strategy in order to prevent the development of virulent populations.

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“…The nematode is considered to be one of their major phytopathological soil problems . Fumigant and non-fumigant nematicides are used to control Meloidogyne on vegetable crops, but increasing environmental concerns and government regulations have contributed to a greater emphasis on other control measures (Ornat et al, 2001). Researchers have been investigating alternative ways to control nematodes and other soil-born pests.…”

Section: Introductionmentioning

confidence: 99%

“…Examples of such populations have been found in some European countries such as France, Greece (Crete) and Spain (Castagnone-Sereno et al, 1991, 1999Tzortzakakis et al, 1998;Ornat et al, 2001;Jacquet et al, 2005;Verdejo-Lucas et al, 2009, 2012. The selection of Meloidogyne populations virulent to tomato cultivars carrying the Mi gene may occur naturally or arise from repeated cultivation of resistant rootstocks over three consecutive years .…”

Section: Introductionmentioning

confidence: 99%

Development of virulence to Meloidogyne incognita on resistant pepper rootstocks

Ibañez

Robertson

Martinez-Lluch

et al. 2014

Span. j. agric. res.

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The root-knot nematode (RKN) Meloidogyne incognita is a major soil parasite of pepper crops in greenhouses in Southeast Spain. Due to the limitations of the use of soil fumigants, grafting plants on resistant rootstocks (R-rootstocks) has become an important alternative to chemical nematicides. The repeated use of R-rootstocks can bring about the selection of virulent populations capable of overcoming resistance. We carried out a six-year investigation on resistant rootstocks in a naturally M. incognita infested greenhouse, and found that two successive years of growing plants grafted on R-rootstocks Atlante (ATL) were sufficient to overcome resistance (galling index 1.5 and 5.6 in the first and second years respectively). A large variability was observed between several R-rootstocks. Two R-rootstocks (C19 and Snooker) behaved like ATL while two others (Terrano and DRO 8801) were not infected by RKN. Laboratory studies with the same R-rootstocks, inoculated with two nematode isolates (avirulent and virulent against ATL) confirmed the greenhouse results, indicating that some rootstocks may be infested by virulent populations and others may not. It suggests that different R-genes, which are differentially overcome by RKN, have been introgressed into the rootstocks. This may have consequences for the management of resistant rootstocks in the field.

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A Population of Meloidogyne javanica in Spain Virulent to the Mi Resistance Gene in Tomato

Cited by 77 publications

References 6 publications

Screening of Tomato Genotypes for Root Knot Nematode (Meloidogyne incognita Kofoid and White Chitwood)

Screening of Tomato Genotypes for Root Knot Nematode (Meloidogyne incognita Kofoid and White Chitwood)

Host status of cultivated plants to Meloidogyne hispanica

Development of virulence to Meloidogyne incognita on resistant pepper rootstocks

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