Journal of nematology最新文献

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":"https://doi.org/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":"https://doi.org/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

Morphological and molecular characterization of Paractinolaimus uljinensis n. sp. (Nematoda: Actinolaimidae) from Korea, with an updated compendium of the genus. Morphological and molecular characterization of Paractinolaimus uljinensis n. sp. (Nematoda: Actinolaimidae) from Korea, with an updated compendium of the genus.

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-2024-0040

Abraham Okki Mwamula, Yi Seul Kim, Dong Woon Lee

{"title":"Morphological and molecular characterization of Paractinolaimus uljinensis n. sp. (Nematoda: Actinolaimidae) from Korea, with an updated compendium of the genus.","authors":"Abraham Okki Mwamula, Yi Seul Kim, Dong Woon Lee","doi":"10.2478/jofnem-2024-0040","DOIUrl":"10.2478/jofnem-2024-0040","url":null,"abstract":"A new species of the genus Paractinolaimus isolated from the bark of a dead red pine tree was characterized using morphometric data and molecular DNA barcodes. Paractinolaimus uljinensis n. sp. was characterized by its medium sized body 2.50 to 2.98 mm long; lip region truncate, angular and offset by a depression; odontostyle 23.5 to 27.0 μm long; basal shield of pharynx present; vulval opening wide and longitudinal, positioned slightly anteriorly (V = 42.5-47.7); several advulval papillae; female tail long and filiform (324.0-435.0 μm long, c' = 10.1-14.2); a clearly visible copulatory hump; spicules 60.0 to 70.5 μm long; 12 to 15 (mostly 12-14) large contiguous ventromedian supplements, and male tail conoid to broadly rounded. The new species was morphologically compared with P. intermedius, P. sahandi, P. decraemerae, P. acutus, P. macrolaimus, and P. tuberculatus. The phylogenetic relationships among species were reconstructed using 18S- and 28S-rRNA gene sequences. The phylogenies showed well-supported sister relations of Paractinolaimus uljinensis n. sp. with P. sahandi, P. macrolaimus, and P. decraemerae. In addition, the ITS-rRNA gene sequences of Paractinolaimus uljinensis n. sp. were supplied, representing the first characterization of the gene for the genus.","PeriodicalId":16475,"journal":{"name":"Journal of nematology","volume":"56 1","pages":"20240040"},"PeriodicalIF":1.4,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11498934/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142502312","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

Response of Origanum dictamnus L. (Cretan dittany) to Five Species of Root-Knot Nematodes (Meloidogyne spp.). 牛至（Origanum dictamnus L.）对五种根结线虫（Meloidogyne spp.）

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-2024-0037

Emmanuel A Tzortzakakis, Carolina Cantalapiedra-Navarrete, Pablo Castillo, Juan E Palomares-Rius, Antonio Archidona-Yuste

引用次数: 0

Evaluating Vacuum and Steam Heat to Eliminate Pinewood Nematodes in Naturally Infested Whole Pine Logs. 评估用真空和蒸汽加热消除受自然侵染的整根松树原木中的松材线虫。

IF 1.4 4区生物学

Journal of nematology Pub Date : 2024-10-05 eCollection Date: 2024-03-01 DOI: 10.2478/jofnem-2024-0038

J D Eisenback, Z Chen, M White

{"title":"Evaluating Vacuum and Steam Heat to Eliminate Pinewood Nematodes in Naturally Infested Whole Pine Logs.","authors":"J D Eisenback, Z Chen, M White","doi":"10.2478/jofnem-2024-0038","DOIUrl":"10.2478/jofnem-2024-0038","url":null,"abstract":"Pinewood nematodes threaten forest health and continue to interfere with international trade because they can be spread around the globe via nematode-infested wood. International Standards for Phytosanitary Measure (ISPM-15) requires that all pine wood be treated at 56°C for 30 min to ensure that all pests and pathogens are killed within sawn wood, whereas fumigation with methyl bromide is the currently approved practice and widely used in treating whole logs. A method of treatment that uses less energy and time or does not rely on environmentally damaging gases is urgently needed. Because vacuum with steam has shown promise in treating several different commodities, the purpose of this study was to use it to eradicate pinewood nematodes in whole logs. Three protocols were applied: 1) 48°C for 15 min., 2) 56°C for 30 min., and 3) 60°C for 60 min. The third protocol reduced the population to statistically zero; however, some samples contained at least 1 survivor. Unfortunately, these surviving nematodes increased in number one month after treatment, and one year later, they continued to reproduce in the wood. Therefore, this protocol needs to be further refined to remove pinewood nematodes completely. Explanation of the survival of individual nematodes within whole logs remains a matter for conjecture: 1) certain portions of the wood were somehow insulated from the heat and did not achieve the lethal temperature, and 2) survival stages may be able to survive temperatures that are deadly to the normal life stages.","PeriodicalId":16475,"journal":{"name":"Journal of nematology","volume":"56 1","pages":"20240038"},"PeriodicalIF":1.4,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11456328/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142381083","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 two new Pristionchus species from South Korea. 描述来自韩国的两个 Pristionchus 新种。

IF 1.4 4区生物学

Journal of nematology Pub Date : 2024-10-04 eCollection Date: 2024-03-01 DOI: 10.2478/jofnem-2024-0032

Matthias Herrmann, Natsumi Kanzaki, Christian Weiler, Penghieng Theam, Christian Rödelsperger, Ralf Sommer

引用次数: 0

Description and Molecular Characterization of a New Dorylaimid Nematode, Mesodorylaimus pini n. sp. (Nematoda: Dorylaimidae) from Korea. 来自韩国的一种新的Dorylaimid线虫Mesodorylaimus pini n. sp.（线虫纲：Dorylaimidae）的描述和分子特征。

IF 1.4 4区生物学

Journal of nematology Pub Date : 2024-09-30 eCollection Date: 2024-03-01 DOI: 10.2478/jofnem-2024-0028

Abraham Okki Mwamula, Sang Myeong Lee, Young Hak Jung, Yi Seul Kim, Dong Woon Lee

{"title":"Description and Molecular Characterization of a New Dorylaimid Nematode, Mesodorylaimus pini n. sp. (Nematoda: Dorylaimidae) from Korea.","authors":"Abraham Okki Mwamula, Sang Myeong Lee, Young Hak Jung, Yi Seul Kim, Dong Woon Lee","doi":"10.2478/jofnem-2024-0028","DOIUrl":"10.2478/jofnem-2024-0028","url":null,"abstract":"Mesodorylaimus pini n. sp., a new species isolated from the bark and cambium layer of a dead black pine tree is characterized herein using integrative taxonomy, considering both morphological and molecular phylogenetic analyses of the 18S- and 28S-rRNA genes. Mesodorylaimus pini n. sp. is characterized by having a medium-sized body 1.50-1.89 mm long; lip region angular and offset by a depression; a relatively long odontostyle (17.0-19.0 μm); vulval opening a transverse slit, positioned slightly posteriorly; pars refringens vaginae with two elongated drop-shaped to spindle-shaped sclerotizations; an intestine-prerectum junction with a long anteriorly directed conical or tongue-like projection; a relatively long female tail (115-187 μm); spicules 48.0-57.0 μm long; and regularly spaced 7-8 ventromedian supplements. It is closest to M. subtilis, especially in having similar body length and number of ventromedian supplements but can be differentiated from M. subtilis by the longer odontostyle, tongue-like projection, and longer spicules. The phylogenies based on the 18S- and 28S-rRNA sequences showed a well-supported sister relation of M. pini n. sp. with M. subtilis, M. japonicus, M. bastiani, M. pseudobastiani, Calcaridorylaimus castaneae, C. heynsi, and other member species of the group.","PeriodicalId":16475,"journal":{"name":"Journal of nematology","volume":"56 1","pages":"20240028"},"PeriodicalIF":1.4,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11441914/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142348376","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

Nematode genome announcement: A chromosome-scale genome assembly for the Pristionchus pacificus reference mapping strain PS1843. 线虫基因组公告：Pristionchus pacificus 参考制图菌株 PS1843 的染色体级基因组组装。

IF 1.4 4区生物学

Journal of nematology Pub Date : 2024-09-11 eCollection Date: 2024-03-01 DOI: 10.2478/jofnem-2024-0063

Waltraud Röseler, Ralf J Sommer, Christian Rödelsperger

{"title":"Nematode genome announcement: A chromosome-scale genome assembly for the Pristionchus pacificus reference mapping strain PS1843.","authors":"Waltraud Röseler, Ralf J Sommer, Christian Rödelsperger","doi":"10.2478/jofnem-2024-0063","DOIUrl":"10.2478/jofnem-2024-0063","url":null,"abstract":"Pristionchus pacificus is a free-living nematode that shares many features with Caenorhabditis elegans, such as its short generation time and hermaphroditism, but also exhibits novel traits, i.e., a mouth-form dimorphism that enables predation. The availability of various genetic tools and genomic resources make it a powerful model organism for comparative studies. Here, we present an updated genome of the P. pacificus strain PS1843 (Washington) that is most widely used for genetic analysis. Assembly of PacBio reads together with reference-guided scaffolding resulted in a chromosome-scale genome spanning 171Mb for the PS1843 strain. Whole genome alignments between the P. pacificus PS1843 genome and the genome of the P. pacificus reference strain PS312 (California) revealed megabase-sized regions on chromosomes III, IV, and X that explain the majority of genome size difference between both strains. The improved PS1843 genome will be useful for future forward genetic studies and evolutionary genomic comparisons at the intra-species level.","PeriodicalId":16475,"journal":{"name":"Journal of nematology","volume":"56 1","pages":"20240063"},"PeriodicalIF":1.4,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11406906/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142289442","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