Differences Between ITS Regions of Isolates of Root-knot Nematodes<i>Meloidogyne hapla</i>and<i>M. chitwoodi</i>

Zijlstra, C.; Lever, A. E. M.; Uenk, B. J.; Silfhout, C.H. van

doi:10.1094/phyto-85-1231

Cited by 105 publications

(66 citation statements)

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“…In addition to the present study, polymorphisms within the ITS region in the same individual have been reported in plants (reviewed in Baldwin et al, 1995), beetles (Vogler and DeSalle, 1994), and nematodes (Zijlstra et al, 1995). Nonorthologous ITS sequences that have been maintained in plants typically span the entire ITS region (Suh et al, 1993;Ritland et al, 1993), but in Bubba (Winteraceae) polymorphisms are restricted to the ITS1 rDNA (Suh et al, 1993).…”

Section: Discussionsupporting

confidence: 59%

Two Divergent Intragenomic rDNA ITS2 Types within a Monophyletic Lineage of the FungusFusariumAre Nonorthologous

O’Donnell

Cigelnik

1997

Molecular Phylogenetics and Evolution

1,856

674

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Section: Discussionsupporting

confidence: 59%

Two Divergent Intragenomic rDNA ITS2 Types within a Monophyletic Lineage of the FungusFusariumAre Nonorthologous

O’Donnell

Cigelnik

1997

Molecular Phylogenetics and Evolution

1,856

674

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“…Polymorphisms in the ITS region in the same individual have been reported in plants (Baldwin et al 1995), beetles (Vogler & DeSalle 1994), and nematodes (Zijlstra et al 1995). rDNA polymorphisms in multinucleate fungi, such as members of the Glomales, have been reported by Lloyd MacGilp et al (1996), Lanfranco, Delpero & Bonfante (1999), Pringle, Moncalvo & Vilgalys (2000), and Redecker et al (1999).…”

Section: Nature Of the Polymorphismmentioning

confidence: 87%

A widely distributed ITS polymorphism within a biological species of the ectomycorrhizal fungus Hebeloma velutipes

Aanen

Kuyper

Hoekstra

2001

Mycological Research

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“…All isolates were maintained and propagated on Lycopersicon esculentum L. 'Moneymaker' in glass-house compartments at 20 ± 2°C and 70 to 80% relative humidity (RH). During maintenance, the isolates were tested regularly for possible contamination with other species by observing isozyme phenotypes of esterase and malate dehydrogenase (12,23) and analysis of internal transcribed spacer (ITS) regions of ribosomal DNA (46,47). Additionally, during the experiment, samples of the inocula of the isolates were collected and verified for absence of contamination by analysis of ITS regions.…”

mentioning

confidence: 99%

Variation in Virulence Within Meloidogyne chitwoodi, M. fallax, and M. hapla on Solanum spp.

Beek¹,

Poleij²,

Zijlstra³

et al. 1998

Phytopathology®

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Van der Beek, J. G., Poleij, L. M., Zijlstra, C., Janssen, R., and Janssen, G. J. W. 1998 The root-knot nematode species Meloidogyne chitwoodi Golden et al. and M. hapla Chitwood can cause growth and yield reductions and quality loss in a large number of crops. In potato (Solanum tuberosum L.), these root-knot nematodes are able to reproduce on roots, causing yield reduction (21). M. fallax Karssen, which was described recently (22), is allopatric with M. chitwoodi in the Netherlands, and its host range is similar to that of M. chitwoodi. M. hapla causes little quality damage due to gall formation on the outside of tubers, in contrast to M. chitwoodi (7). Recent observations indicate that M. chitwoodi and M. fallax reproduce similarly on tubers, and both result in quality loss (J. G. van der Beek, unpublished data). In addition to yield reduction and quality loss, an increase in the nematode population due to cultivation of a susceptible host makes these pathogens a potential threat to agriculture in Western Europe, because many crops in the current rotation schemes are good hosts (33). However, M. hapla does not reproduce on monocotyledonous crops, which may be used in rotation with dicotyledons as an effective control measure.The introduction of resistant potato cultivars also would improve the efficiency of crop rotation in reducing this threat. However, in current potato cultivars, no desirable level of resistance to M. chitwoodi and M. hapla has been identified (7,17).Thus far, intraspecific variation in M. chitwoodi has been described by the occurrence of three host races that can be distinguished on alfalfa cv. Thor (nonhost for race 1 and host for races 2 and 3), carrot cv. Red Cored Chantenay (host for race 1 and nonhost for races 2 and 3), and S. bulbocastanum Dun. SB22 (nonhost for races 1 and 2 and host for race 3) (26,27,36).Resistance to M. chitwoodi and M. fallax has been identified in accessions of wild tuber-bearing Solanum species, originating mainly from Central America, such as S. bulbocastanum and S. hougasii Corr. (5,6,18). Resistance to M. chitwoodi has been transferred from a resistant genotype of S. bulbocastanum to the gene pool of the cultivated potato by somatic hybridization (1,7), and a single gene has been localized on chromosome 11 that appears to control this resistance (8). Also, various levels of resistance to M. hapla have been reported (9,15,18). Recent investigations indicated the presence of variation in host responses to different M. hapla isolates on some genotypes of S. bulbocastanum, S. hougasii, S. chacoense Bitt., S. gourlayi, S. sparsipilum, and S. spegazzinii that were selected for resistance (19).In general, the efficacy of resistance depends largely on genetic variation in the virulence of the pathogen and factors involved in the durability of resistance. Often the presence of resistance is concluded from experiments with one or a few isolates. The current study focused on the variation in virulence within M. chitwoodi, M. fallax, and M. hapla by testing s...

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Differences Between ITS Regions of Isolates of Root-knot NematodesMeloidogyne haplaandM. chitwoodi

Cited by 105 publications

References 0 publications

Two Divergent Intragenomic rDNA ITS2 Types within a Monophyletic Lineage of the FungusFusariumAre Nonorthologous

Two Divergent Intragenomic rDNA ITS2 Types within a Monophyletic Lineage of the FungusFusariumAre Nonorthologous

A widely distributed ITS polymorphism within a biological species of the ectomycorrhizal fungus Hebeloma velutipes

Variation in Virulence Within Meloidogyne chitwoodi, M. fallax, and M. hapla on Solanum spp.

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