Journal of nematology最新文献

Opinions and Suggestions on Nematode Faunal Analysis.

IF 1.4 4区生物学

Journal of nematology Pub Date : 2024-12-24 eCollection Date: 2024-03-01 DOI: 10.2478/jofnem-2024-0049

Howard Ferris, Ingrid Varela Benavides

引用次数: 0

Genetic diversity of the recovered populations of Mesocriconema xenoplax (Nematoda: Criconematidae) from orchards in Fars province, Southern Iran.

IF 1.4 4区生物学

Journal of nematology Pub Date : 2024-12-24 eCollection Date: 2024-03-01 DOI: 10.2478/jofnem-2024-0048

Ali Asghar Dehghan, Reza Ghaderi, Akbar Karegar, Abbas Mokaram Hesar

{"title":"Genetic diversity of the recovered populations of Mesocriconema xenoplax (Nematoda: Criconematidae) from orchards in Fars province, Southern Iran.","authors":"Ali Asghar Dehghan, Reza Ghaderi, Akbar Karegar, Abbas Mokaram Hesar","doi":"10.2478/jofnem-2024-0048","DOIUrl":"https://doi.org/10.2478/jofnem-2024-0048","url":null,"abstract":"In this survey, 14 populations of Mesocriconema xenoplax were collected from the rhizosphere of eight fruit and nut trees in Fars province, Southern Iran. The phylogenetic relationships of these populations with other representatives of the species were investigated using sequences of cytochrome c oxidase subunit 1 mitochondrial gene (COI) and D2-D3 expansion fragments of 28S rDNA. Phylogenetic studies indicated a close relationship of the currently sequenced populations with known haplotype groups (HG) in the COI tree and revealed two separate lineages in the 28S rDNA tree. Moreover, the genetic diversity of the populations was analyzed using seven ISSR primers as molecular markers. The estimated genetic diversity among populations regarding associated trees and geographic regions were low values of 3.3% and 5.9%, respectively, indicating high gene flow among the recovered nematode populations. On the other hand, the estimated fixation index (FST) was higher for associated plants than for geographic regions (0.611 vs 0.504) indicating that plant-based population segregation better explains genetic diversity in this species. This work expands our knowledge of the genetic structure of this cosmopolitan species of plant-parasitic nematodes.","PeriodicalId":16475,"journal":{"name":"Journal of nematology","volume":"56 1","pages":"20240048"},"PeriodicalIF":1.4,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11668531/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142885932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Morphological Characterization and Assessment of Genetic Variability of Tylenchulus semipenetrans Populations from Southern Iran. 伊朗南部 Tylenchulus semipenetrans 种群的形态特征和遗传变异评估。

IF 1.4 4区生物学

Journal of nematology Pub Date : 2024-12-15 eCollection Date: 2024-03-01 DOI: 10.2478/jofnem-2024-0047

Mohammad Rumiani, Miloslav Zouhar, Akbar Karegar, Habiballah Hamzehzarghani, Ahmad Tahmasebi, Milad Rashidifard

{"title":"Morphological Characterization and Assessment of Genetic Variability of Tylenchulus semipenetrans Populations from Southern Iran.","authors":"Mohammad Rumiani, Miloslav Zouhar, Akbar Karegar, Habiballah Hamzehzarghani, Ahmad Tahmasebi, Milad Rashidifard","doi":"10.2478/jofnem-2024-0047","DOIUrl":"https://doi.org/10.2478/jofnem-2024-0047","url":null,"abstract":"Molecular data should be combined with morphological data to enhance the reliability of phylogenetic and diagnostic studies on nematodes. In this study, the citrus nematode Tylenchulus semipenetrans collected from citrus orchards in different localities in Fars province, southern Iran, was characterized using the partial sequencing of ITS rDNA, D2-D3 of 28S rDNA and COI mtDNA genes. We also morphometrically characterized the second-stage juveniles (J2) and male specimens. The results showed that T. semipenetrans is a genetically homogeneous species, and only minor nucleotide differences were detected among the populations. Phylogenetic studies demonstrated that most Iranian populations were grouped together, and there were no differences among the populations. However, sequence alignment of ITS, D2-D3 of 28S rDNA and COI mtDNA revealed 17, 24, and 16 single nucleotide variations (SNVs) and 11, 12, and 11 single-nucleotide polymorphisms (SNPs), respectively. The results of the morphometric analysis showed slight morphometric differences among and within the populations of T. semipenetrans. The morphometric differences among citrus nematode populations and the haplotype topology of the populations did not correlate with their geographical origin and host type. The constructed phylogenetic trees showed a close relationship between Tylenchulus and Trophotylenchulus. In addition, the phylogenetic relationships showed that T. musicola is the closest taxon to T. semipenetrans. The results of this study provide a better understanding of the diversity of T. semipenetrans populations and may shed light on the genetic variation of citrus nematode.","PeriodicalId":16475,"journal":{"name":"Journal of nematology","volume":"56 1","pages":"20240047"},"PeriodicalIF":1.4,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11658578/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142864566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

First Report of Hemicriconemoides kanayaensis (Nematoda: Criconematidae) on Tea Plantations in Iran. 伊朗茶园中 Hemicriconemoides kanayaensis（线虫纲：Criconematidae）的首次报告。

IF 1.4 4区生物学

Journal of nematology Pub Date : 2024-12-15 eCollection Date: 2024-03-01 DOI: 10.2478/jofnem-2024-0044

Negin Mirghasemi, Elena Fanelli, Alessio Vovlas, Alberto Troccoli, Salar Jamali, Francesca De Luca

引用次数: 0

Meloidogyne marylandi is Involved in, but not the Primary Cause of Creeping Bentgrass Decline of Putting Greens in Southern California. Meloidogyne marylandi 与南加州果岭匍匐翦股颖衰退有关，但不是主要原因。

IF 1.4 4区生物学

Journal of nematology Pub Date : 2024-11-23 eCollection Date: 2024-03-01 DOI: 10.2478/jofnem-2024-0046

A T Ploeg, H Witte, S A Subbotin, I Tandingan De Ley, J Smith Becker, J O Becker

{"title":"Meloidogyne marylandi is Involved in, but not the Primary Cause of Creeping Bentgrass Decline of Putting Greens in Southern California.","authors":"A T Ploeg, H Witte, S A Subbotin, I Tandingan De Ley, J Smith Becker, J O Becker","doi":"10.2478/jofnem-2024-0046","DOIUrl":"10.2478/jofnem-2024-0046","url":null,"abstract":"Root-knot nematodes were discovered in severely declining creeping bentgrass putting greens at a golf course in Indian Wells, Riverside County, California. The exhibited disease symptoms included chlorosis, stunted growth, and dieback. Based on morphological examination and measurements of J2 females and males, it was suggested that the causal pathogen was Meloidogyne marylandi. This identification was confirmed by analysis of the D2-D3 expansion segments of 28S rRNA and COI gene sequences. The host status of 28 plant species was evaluated in greenhouse trials. All tested monocots, except rye and Allium species, were found to be hosts, while no reproduction occurred on dicots. Temperature-tank experiments helped determine that the life cycle of M. marylandi was completed between 17-35 °C, with a base temperature of 8.3 °C and a required heat sum of 493 degree-days (DD). In greenhouse trials in pasteurized soil and near-ideal growing conditions, M. marylandi did not cause significant growth reduction of creeping bentgrass cv. Penn A-4, even at very high J2 inoculation densities. It is highly probable that other biotic and abiotic factors contributed to the observed putting green damage.","PeriodicalId":16475,"journal":{"name":"Journal of nematology","volume":"56 1","pages":"20240046"},"PeriodicalIF":1.4,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11585362/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142709544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Population Dynamics of Mesocriconema xenoplax Parasitizing Sweet Cherry Trees in British Columbia, Canada. 寄生于加拿大不列颠哥伦比亚省甜樱桃树的 Mesocriconema xenoplax 的种群动态。

IF 1.4 4区生物学

Journal of nematology Pub Date : 2024-11-23 eCollection Date: 2024-03-01 DOI: 10.2478/jofnem-2024-0041

Thomas Forge, Paige Munro

{"title":"Population Dynamics of Mesocriconema xenoplax Parasitizing Sweet Cherry Trees in British Columbia, Canada.","authors":"Thomas Forge, Paige Munro","doi":"10.2478/jofnem-2024-0041","DOIUrl":"10.2478/jofnem-2024-0041","url":null,"abstract":"The ring nematode, Mesocriconema xenoplax, has become recognized as a widespread pest of sweet cherry trees in the Okanagan Valley of British Columbia (BC). Understanding the cumulative impacts of M. xenoplax on tree health, interpreting diagnostic sample data, and predicting the impacts of climate change on M. xenoplax population densities all depend on knowledge of the temporal dynamics of M. xenoplax populations and their linkage with soil temperature and moisture regimes. The objective of this study was to measure population densities of M. xenoplax on a monthly basis over five years, in relation to soil temperature and moisture regimes, in a 16-year-old irrigated sweet cherry orchard. We tested the following hypotheses: (i) population densities would start low each spring and increase continuously with soil degree-day heat accumulation during each growing season, and (ii) year-to-year variation in population growth during the growing season would be correlated with year-to-year variation in soil degree-day heat accumulation. The data did not support these hypotheses and indicated that although there were significant differences in population densities among sample dates, there were no regular seasonal cycles of population growth and decline. We suggest that in mature cherry orchards, density-dependent processes mask the influences of annual changes in soil temperature and moisture on population processes. The data indicate that for diagnostic sampling purposes, all seasons would be equally representative of M. xenoplax population densities in irrigated orchards in BC. Furthermore, the lack of any strong linkage between soil temperature regimes and within- or across-year population dynamics indicate that modeling efforts based solely on abiotic drivers of temperature and moisture would not likely represent changes in population dynamics of M. xenoplax that will actually occur with climate change.","PeriodicalId":16475,"journal":{"name":"Journal of nematology","volume":"56 1","pages":"20240041"},"PeriodicalIF":1.4,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11585361/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142709736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Rate of Decline of Sugarbeet Cyst Nematode in Central California Under Nonhost Crops May Impact Biofuel Production. 加州中部非寄主作物下甜菜孢囊线虫的衰退速度可能会影响生物燃料生产。

IF 1.4 4区生物学

Journal of nematology Pub Date : 2024-11-10 eCollection Date: 2024-03-01 DOI: 10.2478/jofnem-2024-0045

B B Westerdahl, E P Caswell-Chen, F R Kegel

{"title":"The Rate of Decline of Sugarbeet Cyst Nematode in Central California Under Nonhost Crops May Impact Biofuel Production.","authors":"B B Westerdahl, E P Caswell-Chen, F R Kegel","doi":"10.2478/jofnem-2024-0045","DOIUrl":"10.2478/jofnem-2024-0045","url":null,"abstract":"Crop rotation has been a commercial practice for managing the sugarbeet cyst nematode (Heterodera schachtii, SBCN) since the 1950s. Research conducted in southern California established that SBCN populations decline at the rate of 49% to 80% per year, leading to estimates that three- to four-year rotations to nonhost crops would be sufficient to reduce SBCN densities to nondamaging levels. Following grower reports that much longer rotations were needed in central California, trials were conducted to establish the rate of decline of SBCN in the San Joaquin Valley. Ten commercial fields with a history of SBCN infestation were sampled periodically for up to 6.3 years. In each field, 10 circular subplots located 30.5 meters apart (each with a 6-m radius) were established with reference to a permanent landmark. On each sampling date, 12 subsamples from each subplot were taken randomly from the top 0 cm to 30 cm of soil and composited into a single sample. Standard techniques were utilized to extract and count cysts and eggs from soil samples. Average yearly rates of population decline in the sampled fields ranged from 11.4% to 25.8%. This finding has implications for SBCN management in California sugarbeets grown for biofuel, as the lower decline rates indicate that longer nonhost rotation periods than previously anticipated may be necessary.","PeriodicalId":16475,"journal":{"name":"Journal of nematology","volume":"56 1","pages":"20240045"},"PeriodicalIF":1.4,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11550871/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142635782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Description of Panagrolaimus namibiensis n. sp. (Rhabditida: Panagrolaimidae), an Anhydrobiotic Nematode from the Namib Desert of Namibia. 描述纳米比亚纳米布沙漠中的一种水生线虫--Panagrolaimus namibiensis n. sp.（Rhabditida: Panagrolaimidae）。

IF 1.4 4区生物学

Journal of nematology Pub Date : 2024-10-31 eCollection Date: 2024-03-01 DOI: 10.2478/jofnem-2024-0039

Christopher J Rawson, London Nemmers, Stacey Criswell, Ashleigh B Smythe, Alison K Burke, Eugene Marais, Gillian Maggs-Kölling, Amy M Treonis

{"title":"Description of Panagrolaimus namibiensis n. sp. (Rhabditida: Panagrolaimidae), an Anhydrobiotic Nematode from the Namib Desert of Namibia.","authors":"Christopher J Rawson, London Nemmers, Stacey Criswell, Ashleigh B Smythe, Alison K Burke, Eugene Marais, Gillian Maggs-Kölling, Amy M Treonis","doi":"10.2478/jofnem-2024-0039","DOIUrl":"10.2478/jofnem-2024-0039","url":null,"abstract":"Panagrolaimus namibiensis n. sp. was recovered and cultured from soils collected under Arthraerua leubnitziae (pencil-bush) in the Namib Desert of Namibia, one of the driest terrestrial habitats on Earth. It is described here based on morphometrics, scanning electron micrographs, light images, line drawings, and molecular data. The new species is distinguished by having a conspicuous posterior deirid, a hook-shaped stegostomal dorsal tooth, and anterior deirids and excretory pore aligned at mid-bulb. It was morphologically compared to eleven well-described species in the genus with which it shared similar labial structure (six distinct rounded lips, and low lip segments separated in pairs), conoid tail, and/or a lateral field with three incisures, including P. labiatus, P. kolymaensis, P. davidi, P. rigidus, and P. superbus. Bayesian phylogenetic analyses using SSU and LSU rDNA each placed P. namibiensis n. sp. within clades of Panagrolaimus species, although the two trees resolved its relationship to previously described species differently. Furthermore, our analyses showed the genus is not monophyletic. In a laboratory experiment, P. namibiensis n. sp. survived exposure to 0% relative humidity for 24 h, demonstrating the anhydrobiotic ability of this species that contributes to its survival in the Namib Desert.","PeriodicalId":16475,"journal":{"name":"Journal of nematology","volume":"56 1","pages":"20240039"},"PeriodicalIF":1.4,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11524677/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142558078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Morphological and Molecular Characterization of Meloidogyne arenaria () Populations Parasitizing Pistachio in Kerman and Khorasan Razavi Provinces, Iran. 伊朗克尔曼省和呼罗珊拉扎维省寄生开心果的 Meloidogyne arenaria （）种群的形态学和分子特征。

IF 1.4 4区生物学

Journal of nematology Pub Date : 2024-10-28 eCollection Date: 2024-03-01 DOI: 10.2478/jofnem-2024-0043

Fatemeh Shekari Mahoonaki, Esmat Mahdikhani Moghadam, Mohammad Zakiaghl, Mohammad Moradi, Majid Pedram

{"title":"Morphological and Molecular Characterization of Meloidogyne arenaria () Populations Parasitizing Pistachio in Kerman and Khorasan Razavi Provinces, Iran.","authors":"Fatemeh Shekari Mahoonaki, Esmat Mahdikhani Moghadam, Mohammad Zakiaghl, Mohammad Moradi, Majid Pedram","doi":"10.2478/jofnem-2024-0043","DOIUrl":"10.2478/jofnem-2024-0043","url":null,"abstract":"Root-knot nematodes (RKNs) are the most destructive nematode species in main pistachio cultivation areas of Iran, and adversely affect crop quality and yield. So far, Meloidogyne incognita and M. javanica have been reported infecting pistachio. In this study, four populations of M. arenaria were found infecting pistachio in Kerman and Khorasan Razavi provinces. The morphology and morphometrics of the recovered populations closely match the data given for other populations of the species. Molecular characterization of the recovered populations was performed by sequencing three genomic and mitochondrial regions, including D2-D3 of LSU rDNA, COII-16S and Nad5 mtDNA. The D2-D3 sequences had more than 99% identity with many sequences of tropical species. The COII-16S sequences had more than 99% identity with sequences of M. arenaria, M. morocciensis and M. thailandica. The Nad5 sequences had 99.81% identity with some sequences of M. arenaria. The D2-D3 and COII-16S sequences of M. arenaria did not form independent clades in corresponding Bayesian trees, but Nad5 sequences formed a monophyletic group in corresponding phylogeny. Based on this study, M. arenaria is present in Iran's pistachio gardens, necessitating appropriate management measures.","PeriodicalId":16475,"journal":{"name":"Journal of nematology","volume":"56 1","pages":"20240043"},"PeriodicalIF":1.4,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11515936/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142522094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Efficacy of Fluorinated Nematicides for Management of Root-knot Nematodes in California Processing Tomatoes. 氟化杀线虫剂对加州加工番茄根结线虫的防治效果。

IF 1.4 4区生物学

Journal of nematology Pub Date : 2024-10-23 eCollection Date: 2024-03-01 DOI: 10.2478/jofnem-2024-0034

Antoon T Ploeg, Scott Edwards, Angelo Loffredo, Jörn Ole Becker

{"title":"Efficacy of Fluorinated Nematicides for Management of Root-knot Nematodes in California Processing Tomatoes.","authors":"Antoon T Ploeg, Scott Edwards, Angelo Loffredo, Jörn Ole Becker","doi":"10.2478/jofnem-2024-0034","DOIUrl":"10.2478/jofnem-2024-0034","url":null,"abstract":"California is the primary US producer of processing tomatoes. After decades-long excellent protection against the common tropical Meloidogyne spp. M. incognita, M. javanica, and M. arenaria (root-knot nematode: RKN) by Mi-resistant tomato cultivars, resistance-breaking RKN populations are spreading throughout the San Joaquin Valley. For some time, nematicidal crop management tools have diminished under CA State regulatory pressure. In recent years, new non-volatile compounds have been developed with novel modes of action. In this project with susceptible processing tomato grown on an M. incognita-infested site, the efficacy of three fluorinated nematicides was evaluated in 10 field trials from 2011 to 2021. Seven trials included fluensulfone, six included fluazaindolizine, and five included fluopyram. On average, tomato root-galling (0 - 10 scale) at harvest was reduced by 3.2, 2.3, and 2.5 by fluazaindolizine, fluensulfone, and fluopyram, respectively, compared to the untreated control. These reductions in root-galling corresponded with estimated yield gains of approximately 21%, 14%, and 15%, respectively, over the untreated control. The reproduction of RKN during the tomato crop was not affected by the nematicides. The tested compounds have a very low acute mammalian toxicity and are more target-specific than previous generations of nematicides. However, there is considerable concern about the persistence of synthetic per- and polyfluoroalkyl substances (PFAS) in the environment, including pharmaceuticals and pesticides containing fluorine with the C-F3 functional group.","PeriodicalId":16475,"journal":{"name":"Journal of nematology","volume":"56 1","pages":"20240034"},"PeriodicalIF":1.4,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11550872/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142622244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0