Journal of nematology最新文献

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Aqueous Extracts of Organic Mulch Materials Have Nematicide and Repellent Effect on Meloidogyne incognita Infective Juveniles: A Laboratory Study. 有机地膜材料的水提取物对南方根结线虫感染的青少年具有杀线虫和驱避作用:一项实验室研究。
IF 1.4 4区 生物学
Journal of nematology Pub Date : 2023-09-01 eCollection Date: 2023-02-01 DOI: 10.2478/jofnem-2023-0037
Renáta Petrikovszki, Ferenc Tóth, Péter I Nagy
{"title":"Aqueous Extracts of Organic Mulch Materials Have Nematicide and Repellent Effect on <i>Meloidogyne incognita</i> Infective Juveniles: A Laboratory Study.","authors":"Renáta Petrikovszki, Ferenc Tóth, Péter I Nagy","doi":"10.2478/jofnem-2023-0037","DOIUrl":"10.2478/jofnem-2023-0037","url":null,"abstract":"<p><p>While the nematicidal effectiveness of mulching against root-knot nematodes (<i>Meloidogyne</i> spp.) is calculated within organic crop protection, underlying mechanisms are not yet fully explored. Laboratory experiments were set up to determine whether mulch-derived substances cause mortality directly, or repel <i>Meloidogyne</i> juveniles from crop rhizosphere. Mortality and area choice tests were conducted with mulch-derived extracts, supported by the measurements on tannic acid content and the pH values of extracts as supplementary examinations. In our study, leaf litter and straw extracts were generally found lethal to the juveniles, which is in line with the results from area preference tests. However, compost extract had no effect on <i>Meloidogyne incognita</i> juveniles. Tannic acid content showed positive correlation with mortality only in the case of straw and sycamore leaf litter extracts. Tannic acid and pH weakly correlated with repellent effect of the applied extracts generally. Our results have inspired further experiments to explore nematicidal components of leaf litters, contributing to the development of a new approach in crop protection based on the repellent effect of these materials.</p>","PeriodicalId":16475,"journal":{"name":"Journal of nematology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10473840/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10230446","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
Evaluation of Solanaceous Species as Nonhost Trap Crops for Globodera pallida. 茄属植物作为白球蛾非寄主诱捕作物的评价
IF 1.4 4区 生物学
Journal of nematology Pub Date : 2023-09-01 eCollection Date: 2023-02-01 DOI: 10.2478/jofnem-2023-0036
Paige Hickman, Louise-Marie Dandurand
{"title":"Evaluation of Solanaceous Species as Nonhost Trap Crops for <i>Globodera pallida</i>.","authors":"Paige Hickman, Louise-Marie Dandurand","doi":"10.2478/jofnem-2023-0036","DOIUrl":"10.2478/jofnem-2023-0036","url":null,"abstract":"<p><p><i>Globodera pallida</i>, the pale cyst nematode (PCN), is a quarantine pest of potato posing a serious threat to the Idaho potato industry. <i>Globodera pallida</i> only hatches in the presence of a hatching stimulus produced by a host plant or closely related species. In the absence of this hatching stimulus, <i>G. pallida</i> can remain viable in the soil for decades. A trap crop stimulates hatch of <i>G. pallida</i> but is a nonhost, which means the nematode cannot develop or reproduce. This study evaluated the trap crop potential of several solanaceous species by determining <i>G. pallida</i> host status and hatching effect of each species. The species under investigation included <i>Solanum aethiopicum</i>, <i>S. macrocarpon</i>, <i>S. quitoense</i>, <i>S. retroflexum</i>, and <i>S. douglasii</i>. All species were determined to be nonhosts of <i>G. pallida</i>. The most promising trap crop candidates with a hatching stimulatory effect comparable to potato were <i>S. quitoense</i> and <i>S. retroflexum.</i> Further research is needed to assess whether these species could be effective <i>G. pallida</i> trap crops under Idaho field conditions.</p>","PeriodicalId":16475,"journal":{"name":"Journal of nematology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10152465/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47582879","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
Chemical Profiles of Heterodera glycines Suppressive Soils in Double Cropping Soybean Production. 双季大豆生产中抑制大豆缩氨酸异菌土壤的化学剖面。
IF 1.4 4区 生物学
Journal of nematology Pub Date : 2023-08-29 eCollection Date: 2023-02-01 DOI: 10.2478/jofnem-2023-0030
Leonardo F Rocha, Mary E Kinsel, Jason P Bond, Ahmad M Fakhoury
{"title":"Chemical Profiles of <i>Heterodera glycines</i> Suppressive Soils in Double Cropping Soybean Production.","authors":"Leonardo F Rocha, Mary E Kinsel, Jason P Bond, Ahmad M Fakhoury","doi":"10.2478/jofnem-2023-0030","DOIUrl":"10.2478/jofnem-2023-0030","url":null,"abstract":"<p><p>We previously reported soybean fields double-cropped with winter wheat having reduced soybean cyst nematode (SCN) (<i>Heterodera glycines</i>) counts compared to fallow. A follow-up metagenomics study identified several fungal and bacterial taxa enriched in wheat fields, and some were reported to parasitize SCN. Knowing that phytocompounds with potential nematicidal activity are released via wheat roots and stubble, we implemented a dichloromethane-based extraction method and a gas chromatography-mass spectrometry (GCMS) system to investigate soil chemical profiles of samples collected from these fields and review the potential nematicidal activity of compounds with higher concentration in double cropping fields. 51 compounds were detected during the GCMS analysis, eight with unknown identification. Several compounds, including multiple fatty acids, had larger relative peak areas when double-cropped, compared to fallow samples. This study, along with our previously published one, provided a better understanding of the mechanisms that govern the effect of wheat on SCN populations. Rather than driven by a single mechanism, the suppression of SCN in soybean fields double-cropped with winter wheat was potentially linked to enriched microbial communities, increased populations of beneficial organisms, and higher concentrations of chemicals with potential nematicidal activity. To our knowledge, this is the first study using GCMS to characterize soil chemical profiles in soybean fields double-cropped with winter wheat regarding the suppression of SCN populations.</p>","PeriodicalId":16475,"journal":{"name":"Journal of nematology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10561077/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41203487","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
Nematicidal Properties of Chitosan Nanoformulation. 壳聚糖纳米制剂的向列性质。
IF 1.4 4区 生物学
Journal of nematology Pub Date : 2023-08-24 eCollection Date: 2023-02-01 DOI: 10.2478/jofnem-2023-0033
R Mouniga, B Anita, A Lakshmanan, A Shanthi, G Karthikeyan
{"title":"Nematicidal Properties of Chitosan Nanoformulation.","authors":"R Mouniga, B Anita, A Lakshmanan, A Shanthi, G Karthikeyan","doi":"10.2478/jofnem-2023-0033","DOIUrl":"10.2478/jofnem-2023-0033","url":null,"abstract":"<p><p>Chitosan is the second most abundant bio-polymer available in the world, second only to cellulose. It is found in crustaceous shells, e.g., those of crabs, shrimps, prawns, and fungi, as well as insect exoskeletons. The use of nanoformulations for the management of pests and diseases is receiving increased interest with the advancement of nanotechnology. Here, chitosan nanospheres were obtained from chitosan using the ionic gelation technique. The nanoformulations obtained were characterized using a particle size analyzer, Fourier transform infrared spectroscopy, and a transmission electron microscope. The efficacy of chitosan nanospheres in suppressing the root-knot nematode <i>Meloidogyne incognita</i> was studied. The particle size of nanospheres formulated for this study was 380.2 nm, with a polydispersity index (PI) of 0.4 and Zeta potential of 45.7 or 50.9 mV at pH 5.2. The chitosan nanospheres were spherical and the particles did not agglomerate. FTIR spectra of the chitosan nanospheres peaked at 3334 cm<sup>-1</sup>, thereby indicating the stretching of the OH and NH group. In In-vitro studies, chitosan nanospheres showed significant nematicidal activity against <i>M. incognita</i>. Under pot culture conditions, chitosan nanospheres (1%- active compound chitosan) at 2ml/plant decreased the nematode population in roots or soil. Compared to the control, the number of galls was reduced by 83.68%, the number of egg masses by 83.85%, the number of adult females by 66.56%, and the number of second-stage juveniles by 73.20%. In a field experiment, application of chitosan nanospheres (1%) was followed by a 18.75% increase in fruit yield compared to the non-treated control.</p>","PeriodicalId":16475,"journal":{"name":"Journal of nematology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10446853/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10229424","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
Seed Treatments for Management of Soybean Cyst Nematode, Heterodera glycines, in Mid-Atlantic Soybean Production. 大西洋中部大豆生产中大豆囊性线虫(Heterodera glycines)的种子处理。
IF 1.4 4区 生物学
Journal of nematology Pub Date : 2023-08-01 eCollection Date: 2023-02-01 DOI: 10.2478/jofnem-2023-0026
Alexandra C Kessler, Alyssa M Koehler
{"title":"Seed Treatments for Management of Soybean Cyst Nematode, <i>Heterodera glycines</i>, in Mid-Atlantic Soybean Production.","authors":"Alexandra C Kessler, Alyssa M Koehler","doi":"10.2478/jofnem-2023-0026","DOIUrl":"10.2478/jofnem-2023-0026","url":null,"abstract":"<p><p>Soybean Cyst Nematode (SCN), <i>Heterodera glycines</i> Ichinohe, is the most important pathogen of soybean in the Mid-Atlantic region. In recent decades, a decline in the effectiveness of genetic resistance has been observed and additional management approaches are needed. Seed treatments are of rising interest, but no local data on product response exists for the region. In 2020-2021, two experiments were conducted to observe the effects of chemical and biological seed treatment options. In one experiment, chemical seed treatments pydiflumetofen (Saltro®) and fluopyram (ILEVO®) were screened against nontreated plain seed for SCN suppression. In a second experiment, pydiflumetofen, fluopyram and four biological nematode-protectant seed treatments with a standard base insecticide and fungicide treatment were compared to nontreated plain seed and seed with only the standard base treatment to test product efficacy against SCN. Seed treatments increased the percent emergence over plain seed. Nematode reproductive factors and female counts from roots were collected, but did not statistically differ between seed treatments or plain seed. Yield differences were observed in one of the five trials, where pydiflumetofen + base seed treatment yielded the highest (<i>p</i> < 0.001) at 3813.1 kg/ha. Response from seed treatments varied, with no specific seed treatment consistently reducing SCN populations or increasing yield across trials. Seed treatments may have potential as an element of an integrated management approach for SCN.</p>","PeriodicalId":16475,"journal":{"name":"Journal of nematology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10390846/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10603234","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
Multigene Sequence-Based and Phenotypic Characterization Reveals the Occurrence of a Novel Entomopathogenic Nematode Species, Steinernema anantnagense n. sp. 基于多基因序列和表型特征的研究揭示了一种新的昆虫病原线虫Steinerma anantnagense n.sp.的发生。
IF 1.3 4区 生物学
Journal of nematology Pub Date : 2023-07-13 eCollection Date: 2023-02-01 DOI: 10.2478/jofnem-2023-0029
Aashaq Hussain Bhat, Ricardo A R Machado, Joaquín Abolafia, Tarique Hassan Askary, Vladimír Půža, Alba Nazaret Ruiz-Cuenca, Aasha Rana, Samy Sayed, Laila A Al-Shuraym
{"title":"Multigene Sequence-Based and Phenotypic Characterization Reveals the Occurrence of a Novel Entomopathogenic Nematode Species, <i>Steinernema anantnagense</i> n. sp.","authors":"Aashaq Hussain Bhat, Ricardo A R Machado, Joaquín Abolafia, Tarique Hassan Askary, Vladimír Půža, Alba Nazaret Ruiz-Cuenca, Aasha Rana, Samy Sayed, Laila A Al-Shuraym","doi":"10.2478/jofnem-2023-0029","DOIUrl":"10.2478/jofnem-2023-0029","url":null,"abstract":"<p><p>Three entomopathogenic nematode populations were isolated from agricultural fields in the Anantnag district of Jammu and Kashmir (India). Sequences of multiple gene regions and phenotypic features show that they are conspecific and represent a novel species. Molecular and morphological features provided evidence for placing the new species into the \"<i>Kushidai</i>\" clade. Within this clade, analysis of sequence data of the internal transcribed spacer (ITS) gene, the D2D3 region of the 28S rRNA gene, the mitochondrial cytochrome oxidase I (<i>mtCOI</i>) gene, and the mitochondrial 12S (<i>mt12S</i>) gene depicted the novel species as a distinctive entity closely related to <i>Steinernema akhursti</i>, <i>S. kushidai</i>, and <i>S. populi</i>. Phylogenetic analyses also show that the new species is a sister species to <i>S. akhursti</i>, and these two species are closely related to <i>S. kushidai</i> and <i>S. populi</i>. Additionally, the new species does not mate or produce fertile progeny with any of the closely related species, reinforcing its uniqueness from a biological species concept standpoint. The new species is further characterized by the third-stage infective juveniles with almost straight bodies (0.7-0.8 mm length), poorly developed stoma and pharynx, and conoid-elongate tail (49-66 µm) with hyaline posterior part. Adult females are characterized by short and conoid tails bearing a short mucron in the first generation and long conoid tails with thin mucron in the second generation. Adult males have ventrally curved spicules in both generations. Moreover, the first-generation male has rounded manubrium, fusiform gubernaculum, conoid and slightly ventrally curved tails with minute mucron, and the second generation has rhomboid manubrium anteriorly ventrad bent, and tails with long and robust mucron. The morphological, morphometrical, molecular, and phylogenetic analyses support the new species status of this nematode, which is hereby described as <i>Steinernema anantnagense</i> n. sp. The bacterial symbiont associated with <i>S. anantnagense</i> n. sp. represents a novel species, closely related to <i>Xenorhabdus japonica</i>. These findings shed light on the diversity of entomopathogenic nematodes and their symbiotic bacteria, providing valuable information for future studies in this field.</p>","PeriodicalId":16475,"journal":{"name":"Journal of nematology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2023-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10341053/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10236988","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
Plant-Parasitic Nematodes Associated with Cannabis sativa in Florida. 佛罗里达州与大麻相关的植物寄生线虫。
IF 1.3 4区 生物学
Journal of nematology Pub Date : 2023-07-06 eCollection Date: 2023-02-01 DOI: 10.2478/jofnem-2023-0018
J Desaeger, J Coburn, J Freeman, Z Brym
{"title":"Plant-Parasitic Nematodes Associated with <i>Cannabis sativa</i> in Florida.","authors":"J Desaeger, J Coburn, J Freeman, Z Brym","doi":"10.2478/jofnem-2023-0018","DOIUrl":"10.2478/jofnem-2023-0018","url":null,"abstract":"<p><p>The subtropical climate of Florida allows for a wide range of crops to be grown. With the classification of hemp (<i>Cannabis sativa</i> L., <0.3% delta-9-tetrahydrocannabinol) as an agricultural commodity, hemp has become a potential alternative crop in Florida. Hemp cultivars of different geographies (Europe, China, and North America), and uses (fiber, oil and CBD), were evaluated in three field experiments. The field experiments evaluated a total of 26 cultivars and were conducted for two consecutive seasons at three different locations (soil types) in North (sandy loam), Central (fine sand), and South Florida (gravelly loam). Nematode soil populations were measured at the end of each season. A diverse population of plant-parasitic nematodes was found, with reniform nematodes (RN, <i>Rotylenchulus reniformis</i>) the dominant species in North and South Florida (up to 27.5 nematodes/cc soil), and RKN (<i>Meloidogne javanica</i>) the main species in central Florida (up to 4.7 nematodes/cc soil). Other nematodes that were commonly found in south Florida (and to a lesser extent north Florida) were spiral (<i>Helicotylenchus</i> spp.), stunt (<i>Tylenchorhynchus</i> spp.) and ring nematodes (Criconemoids), while in central Florida, stubby root (<i>Nanidorus minor</i>) and sting nematodes (<i>Belonolaimus longicaduatus</i>) were found. No significant difference among hemp cultivars was noted at any of the locations. RKN were found in all three regions and soils, while RN were only found in North and South Florida. This is the first report on plant-parasitic nematodes associated with hemp in Florida fields. Natural nematode populations varied greatly, depending on where in Florida hemp was grown. Growers who wish to include hemp in their crop rotation need to be aware of potential pest pressure from nematodes. More research is needed to determine to what extent nematodes, especially RKN and RN, can reduce hemp growth and yield.</p>","PeriodicalId":16475,"journal":{"name":"Journal of nematology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2023-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10324118/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10602744","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
Belonolaimus longicaudatus management using metam potassium and fluensulfone in potato. 在马铃薯中使用超镁钾和氟磺酮管理长尾贝洛诺赖鼠。
IF 1.4 4区 生物学
Journal of nematology Pub Date : 2023-07-06 eCollection Date: 2023-02-01 DOI: 10.2478/jofnem-2023-0028
Zane J Grabau, Chang Liu, Pablo A Navia Gine
{"title":"<i>Belonolaimus longicaudatus</i> management using metam potassium and fluensulfone in potato.","authors":"Zane J Grabau, Chang Liu, Pablo A Navia Gine","doi":"10.2478/jofnem-2023-0028","DOIUrl":"10.2478/jofnem-2023-0028","url":null,"abstract":"<p><p><i>Belonolaimus longicaudatus</i> (sting nematode) is an important pest in Florida potato production and is managed primarily by fumigation using 1,3-dichloropropene (1,3-D). Other effective nematicides are needed for more flexibility in managing this pest. The objective of this study was to evaluate fluensulfone, metam potassium, and mixtures of the two products, relative to 1,3-D and untreated control, for efficacy at managing sting nematode, and for non-target effects on free-living nematodes in potato. To test this objective, a small-plot field experiment was conducted in northeast Florida in 2020 and repeated in 2021. Metam potassium fumigation (390 kg a.i./treated ha)-with or without fluensulfone-managed sting nematode soil abundances but was phytotoxic to potato. Strategies that mitigate metam potassium phytotoxicity, such as reduced application rates, are needed before efficacy of metam potassium in this system can be determined. As a preplant soil spray, fluensulfone alone (403 g a.i./treated ha) did not manage sting nematode abundances and had an inconsistent effect on yield. Fumigation with 1,3-D (88.3 kg a.i./treated ha) was the only treatment that consistently managed sting nematode and increased potato yield. Nematicides did not consistently affect free-living nematodes.</p>","PeriodicalId":16475,"journal":{"name":"Journal of nematology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10324121/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10602746","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
Virulence of Two Isolates of Meloidogyne enterolobii (Guava Root-Knot Nematode) from North Carolina on Cotton Lines Resistant to Southern Root-Knot Nematode (M. incognita) and Reniform Nematode (Rotylenchulus reniformis). 来自北卡罗来纳州的两个瓜根结线虫分离株对棉花抗南方根结线虫(M.incognita)和肾形线虫(Rotylenchulus reniformis)的毒力。
IF 1.3 4区 生物学
Journal of nematology Pub Date : 2023-06-23 eCollection Date: 2023-02-01 DOI: 10.2478/jofnem-2023-0021
Amanda G Gaudin, Martin J Wubben, Jack C McCarty, Johnie N Jenkins
{"title":"Virulence of Two Isolates of <i>Meloidogyne enterolobii</i> (Guava Root-Knot Nematode) from North Carolina on Cotton Lines Resistant to Southern Root-Knot Nematode (<i>M. incognita</i>) and Reniform Nematode (<i>Rotylenchulus reniformis</i>).","authors":"Amanda G Gaudin, Martin J Wubben, Jack C McCarty, Johnie N Jenkins","doi":"10.2478/jofnem-2023-0021","DOIUrl":"10.2478/jofnem-2023-0021","url":null,"abstract":"<p><p><i>Meloidogyne enterolobii</i> [the guava root-knot nematode (RKN)] is an emerging plant-parasitic nematode that poses a threat to Upland cotton (<i>Gossypium hirsutum</i>) production in the southeastern United States. Like other RKN spp., <i>M. enterolobii</i> has a wide host range and proven ability to overcome resistance sources that have helped protect crops from other <i>Meloidogyne</i> spp., including the southern RKN (<i>Meloidogyne incognita</i>). In this study we evaluated the virulence of two North Carolina <i>M. enterolobii</i> isolates on Upland cotton germplasm lines having resistance quantitative trait loci (QTL) to RKN (M240 RNR, MRk-Rn-1) and/or reniform nematode (<i>Rotylenchulus reniformis</i>) (M713 Ren1, MRk-Rn-1) in comparison to their susceptible recurrent parents (DPL61, SG747). Multiple assays using eggs or J2 as inoculum demonstrated that both isolates reproduced equally well on all germplasm lines, producing reproductive factor (RF) values ≥ 6 on the otherwise nematode-resistant lines. Measurements of seedling growth in control and inoculated containers suggested that existing nematode-resistance QTL may offer a level of tolerance to <i>M. enterolobii</i> infection that should be further explored in greenhouse and field environments. <i>Meloidogyne enterolobii</i> infection of SG747 and MRk-Rn-1 showed nearly identical stages of symptom and nematode development over a time-course of 24 days. These data demonstrate that existing RKN and RN resistance QTL available in elite cotton varieties to producers are most likely insufficient in preventing yield loss due to <i>M. enterolobii</i> and that future research should focus on (i) understanding the <i>M. enterolobii</i>-cotton interaction at the molecular level, and (ii) screening novel germplasm collections to identify resistance loci.</p>","PeriodicalId":16475,"journal":{"name":"Journal of nematology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2023-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10288305/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10602706","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 Reports and Morphological and Molecular Characterization of Pratylenchus delattrei and Quinisulcius capitatus Associated with Chickpea in Ethiopia. 埃塞俄比亚与鹰嘴豆相关的Pratylenchus delattrei和Quinisulcius capitatus的首次报道及其形态学和分子特征。
IF 1.3 4区 生物学
Journal of nematology Pub Date : 2023-06-11 eCollection Date: 2023-02-01 DOI: 10.2478/jofnem-2023-0027
Habtamu Kefelegn, Beira Hailu Meressa, Sunheng Yon, Marjolein Couvreur, Wim M L Wesemael, Misghina G Teklu, Wim Bert
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