Selection of virulent Meloidogyne individuals within mixed isolates by continuous cultivation on a Mi gene resistant tomato genotype

Tzortzakakis, Emmanuel A.; Conceição, Isabel Luci; Santos, Maria Clara Vieira dos; Abrantes, Isabel

doi:10.1007/bf03356269

Cited by 5 publications

(7 citation statements)

References 6 publications

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“…However, although this gene has been an excellent example of the use of host resistance to effectively reduce the need for pesticide application (Sorribas et al 2005), the lack of diversity in the resistance sources exploited explains in part the emergence and spread of Mi-1-virulent nematode populations able to overcome it (Castagnone-Sereno 2002). Indeed, natural virulent isolates have been reported in many areas of the world where tomato is a major crop, and this trend has been increasing recently (e.g., Tzortzakakis et al 2005Tzortzakakis et al , 2008VerdejoLucas et al 2009;Devran and Söğüt 2010), which could significantly reduce the duration of the commercial exploitation of the Mi-1 gene in tomato. Moreover, the artificial selection of virulent lineages from progenies of avirulent Meloidogyne isolates, was demonstrated by repeated inoculations onto Mi-1-resistant tomato genotypes under laboratory and greenhouses conditions (Jarquin- Barberena et al 1991;Castagnone-Sereno et al 1994b;Meher et al 2009).…”

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confidence: 97%

The reproductive potential of the root-knot nematode Meloidogyne incognita is affected by selection for virulence against major resistance genes from tomato and pepper

Djian-Caporalino¹,

Molinari²,

Palloix

et al. 2011

Eur J Plant Pathol

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The emergence of virulent root-knot nematode populations, able to overcome the resistance conferred by some of the resistance genes (R-genes) in Solanaceous crops, i.e., Mi(s) in tomato, Me(s) in pepper, may constitute a severe limitation to their use in the field. Research has been conducted to evaluate the durability of these R-genes, by comparing the reproduction of several laboratory-selected and wild virulent Meloidogyne incognita isolates, on both susceptible and resistant tomatoes and peppers. We first show that the Me1 R-gene in pepper behaves as a robust R-gene controlling avirulent and virulent Me3, Me7 or Mi-1 isolates. Although the reproductive potential of the virulent isolates was highly variable on susceptible and resistant plants, we also confirm that virulence is highly specific to a determined Rgene on which selection has occurred. Another significant experimental result is the observation that a reproductive fitness cost is associated with nematode virulence against Mi-1 in tomato and Me3 and Me7 in pepper. The adaptative significance of trade-offs between selected characters and fitness-related traits, suggests that, although the resistance can be broken, it may be preserved in some conditions if the virulent nematodes are counter-selected in susceptible plants. All these results have important consequences for the management of plant resistance in the field.

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mentioning

confidence: 97%

The reproductive potential of the root-knot nematode Meloidogyne incognita is affected by selection for virulence against major resistance genes from tomato and pepper

Djian-Caporalino¹,

Molinari²,

Palloix

et al. 2011

Eur J Plant Pathol

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“…arenaria collected from balm) and one from Crete (M. incognita collected from susceptible tomato), were unable to reproduce on resistant tomato in pot tests, when six egg masses were inoculated per plant. However, when resistant tomatoes were inoculated with 30 egg masses per plant, a virulent M. javanica was revealed in both cases, composing a minor percentage in the original population which was undetected in the identifi cation process (Tzortzakakis et al, 2008). The only two resistance-breaking popu-5.…”

Section: Resultsmentioning

confidence: 98%

“…The experiment was conducted once. M. javanica and M. incognita) and one from Peloponissos (M. javanica), collected from heavily infected roots of nematode resistant tomato, reproduced at high rates on resistant tomatoes in pot tests (Tzortzakakis et al, 1999(Tzortzakakis et al, , 2005(Tzortzakakis et al, , 2008. Seven populations, two from Crete ( 3.…”

Section: Rkn Population Virulence Testsmentioning

confidence: 99%

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An update on the occurrence of resistance-breaking populations of root-knot nematodes (Meloidogyne spp.) on resistant tomato in Greece with six new records from Crete

Tzortzakakis

Santos

Conceição

2016

Hellenic Plant Protection Journal

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Summary The available published information on the occurrence of resistance-breaking populations of root-knot nematodes (Meloidogyne spp.) on resistant tomato in Greece is updated. Within the period 1994-2013, 13 populations (11 M. javanica and 2 M. incognita) able to reproduce on resistant tomato had been recorded in the regions of Crete, Epirus, Thrace, Peloponissos and Macedonia. In the present study six more resistance-breaking populations, four M. javanica and two M. incognita, were detected in the period 2013-2014, all originating from greenhouse vegetables in Crete. Four of these populations, two M. javanica and two M. incognita, originated from the region of Ierapetra. This is the first time that such populations are found in this major area of greenhouse vegetable production of Crete.

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“…A further population of M. incognita capable to reproduce on resistant tomato but not on several susceptible pepper (Capsicum annuum) cultivars, including California Wonder, was found in the region of Crete (Tzortzakakis et al 1999, 2005, 2008, Tzortzakakis & Blok 2007.…”

Section: Introductionmentioning

confidence: 99%

Occurrence of a new resistant breaking pathotype of Meloidogyne incognita on tomato in Greece

et al. 2014

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In a pot assay, a population of Meloidogyne incognita from Northern Greece, reproduced on the resistant tomato cv. Silvana carrying the Mi gene and on three susceptible pepper cultivars. Its ability to reproduce on the resistant tomato and on pepper cv. California Wonder was sustainable for several generations. Till now, the only resistant breaking population of M. incognita on resistant tomato found in Greece was a distinct one from Crete which did not reproduce on susceptible pepper cultivars. Thus, the population of M. incognita from Northern Greece represents a new type of a resistant breaking pathotype, reported for the first time in the country, and a potential threat for both resistant tomato crops and susceptible peppers in the field.

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Selection of virulent Meloidogyne individuals within mixed isolates by continuous cultivation on a Mi gene resistant tomato genotype

Cited by 5 publications

References 6 publications

The reproductive potential of the root-knot nematode Meloidogyne incognita is affected by selection for virulence against major resistance genes from tomato and pepper

The reproductive potential of the root-knot nematode Meloidogyne incognita is affected by selection for virulence against major resistance genes from tomato and pepper

An update on the occurrence of resistance-breaking populations of root-knot nematodes (Meloidogyne spp.) on resistant tomato in Greece with six new records from Crete

Occurrence of a new resistant breaking pathotype of Meloidogyne incognita on tomato in Greece

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