Short Life of Peach Trees Induced by<i>Criconemella xenoplax</i>

Nyczepir, A. P.; Zehr, E. I.; Lewis, S. A.; Harshman, David

doi:10.1094/pd-67-507

Cited by 44 publications

(32 citation statements)

References 5 publications

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“…Some of the disagreements are merely nomenclatural in nature. For example, the economically important criconematid species known for its association with Peach Tree Shortlife (Nyczepir et al, 1983) and global distribution, has been referred to as Mesocriconema xenoplax (Raski, 1952) Loof, 1989 in the classifications of Brzeski et al (2002b), Subbotin et al (2005), Andr assy (2007), and Geraert (2010). The same species has also been called Macroposthonia xenoplax by Siddiqi (2000) and Wouts (2006), Criconemella xenoplax by Xiang et al (2010) and Mitchum et al (2013), and Criconemoides xenoplax by Decraemer and Geraert (2006), Decraemer and Hunt (2006), and Cid Del Prado Vera and Talavera (2012).…”

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confidence: 99%

An 18S rDNA Perspective on the Classification of Criconematoidea

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Harris

Higgins

et al. 2017

Journal of Nematology

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In the nematode family Criconematidae, a taxonomy primarily based on cuticle characters has created classifications that are notoriously volatile. Molecular characters may lead to their stabilization. A phylogenetic tree of Criconematoidea was constructed using 166 new near full-length 18S rDNA sequences and 58 sequences from GenBank. Bayesian and maximum likelihood (ML) analyses produced trees with similar topologies. Major features include a strongly supported clade that includes Criconematidae and Hemicycliophoridae, excluding Paratylenchidae and Tylenchulidae. Another well-supported clade groups Criconema, Ogma, Crossonema, and Hemicriconemoides plus Xenocriconemella, combining nematodes with cuticular scales with those without scales at any life stage. Mesocriconema, Discocriconemella limitanea, Hemicaloosia, and Lobocriconema are recognized as monophyletic groups, but Criconemoides is paraphyletic. Both trees support an unexpected sister relationship between Bakernema and Hemicycliophora. The 18S rDNA dataset was insufficient for distinguishing genus boundaries between Criconema, Ogma, and Crossonema. The relationships depicted by the 18S rDNA phylogeny suggest that key morphological characters used in the classification of Criconematidae are not homologous.

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confidence: 99%

An 18S rDNA Perspective on the Classification of Criconematoidea

Powers

Harris

Higgins

et al. 2017

Journal of Nematology

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“…PTSL occurs due to a complex combination of biotic and abiotic factors that lead to rapid tree decline and death. The ring nematode [Criconemoides xenoplax (Raski) = Mesocriconema xenoplax (Raski) Loof and de Grisse] is known to be the primary factor in PTSL syndrome (Nyczepir et al, 1983). Ring nematode also has been reported to be present in other regions of the world such as Europe, Brazil and South Africa (Liskova et al, 2004;Nyczepir & Becker, 1998).…”

Section: Discussionmentioning

confidence: 99%

Simple Sequence Repeat Markers for Detecting Sources of Tolerance to PTSL Syndrome in Prunus Persica Rootstocks

et al. 2006

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Peach tree short life (PTSL) is a severe and complex disease syndrome in the Southeast of the United States that causes significant damage to peach orchards and affects more than 70% of the peach acreage in the region. The ring nematode is known to be one of the major factors strongly associated with the PTSL syndrome. A peach rootstock (Guardian R Brand BY520-9, also referred to as Guardian R or BY520-9), which is tolerant to ring nematode and PTSL, was released in 1994. To investigate the genetic relatedness of PTSL tolerant genotypes and identify possible parents of Guardian R selections as sources of the PTSL tolerance trait, 98 genotypes derived from the BY520-9 pedigree, and others showing different degrees of field resistance or susceptibility to PTSL, were selected for simple sequence repeat analysis. Nineteen of 32 microsatellite loci were polymorphic. Allele number averaged 2.7 per locus with heterozygosity levels ranging from 0.07 to 0.60. Cluster analysis of these genotypes produced a dendrogram in agreement with their putative pedigrees. Thirty-eight F 4 genotypes from Guardian pedigree were used for the parental identification analyses. Of those, nine most likely parental genotypes were identified for 10 field tested F 5 genotypes produced from open-pollinated selections of BY520-9.

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“…The resulting injury and physiological response to nematode feeding is thought to increase the vulnerability of peach trees to bacterial canker (Pseudomonas syringae pv. syringae van Hall) and/or to cold injury by the stimulation of indole-3-acetic acid production that interferes with dormancy (Nyczepir et al 1983). Symptoms of PTSL appear in early spring as a wilting or sudden collapse of new growth.…”

Section: Introductionmentioning

confidence: 99%