Nematology最新文献_第7页

New pattern of nematode spermatogenesis revealed by ultrastructural observation of Anaplectus granulosus (Plectidae, Plectida) 颗粒无刺线虫超微结构观察揭示线虫精子发生的新模式（Plectidae，Plectida）

IF 1.2 4区生物学

Nematology Pub Date : 2023-08-25 DOI: 10.1163/15685411-bja10275

V. V. Yushin, M. Claeys, W. Bert

{"title":"New pattern of nematode spermatogenesis revealed by ultrastructural observation of Anaplectus granulosus (Plectidae, Plectida)","authors":"V. V. Yushin, M. Claeys, W. Bert","doi":"10.1163/15685411-bja10275","DOIUrl":"https://doi.org/10.1163/15685411-bja10275","url":null,"abstract":"\u0000This paper presents the first comprehensive detailed transmission electron microscope observations of sperm development and structure of a plectid nematode. Sperm development of Anaplectus granulosus resembles that of nematodes of the order Rhabditida, known as the rhabditid pattern of spermatogenesis. It includes formation of complexes of fibrous bodies (FB) with membranous organelles (MO), which appear in spermatocytes; the complexes dissociate in the spermatids. The mature spermatozoa are bipolar cells subdivided into a pseudopod and a main cell body containing a nucleus with nine singlet centrioles, peripheral mitochondria and MOs. However, the development and structure of sperm in A. granulosus deviates remarkably from the common rhabditid pattern by an unusual early transformation of FBs into large amorphous masses in the spermatids; the subsequent formation of a concentric structure of immature spermatozoa with a predominant amorphous mass around the central nucleus and thin peripheral cytoplasm with organelles (MOs and mitochondria); and by the transformation of MO in mature spermatozoa into simple cisterns. Thus, the pattern of spermatogenesis of A. granulosus supports the close relations of Plectida and Rhabditida, but specific peculiarities of the sperm development delineate Plectida from Rhabditida and other orders.","PeriodicalId":18928,"journal":{"name":"Nematology","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43158670","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ecto- and endo-parasitism of Ditylenchus destructor on garlic roots 大蒜根上双烯虫的外寄生和内寄生

IF 1.2 4区生物学

Nematology Pub Date : 2023-08-25 DOI: 10.1163/15685411-bja10276

Kazuki Tadamura, Dai Mori, A. Torada, T. Yoshiga

引用次数: 0

Dynamics of Aphelenchoides besseyi in different rice cultivars 不同水稻品种贝氏蚜的动态

IF 1.2 4区生物学

Nematology Pub Date : 2023-08-21 DOI: 10.1163/15685411-bja10274

Fang Yang, Jialian Xie, Mei Zhang, Hanlin Wu, Yun-liang Peng, H. Ji

{"title":"Dynamics of Aphelenchoides besseyi in different rice cultivars","authors":"Fang Yang, Jialian Xie, Mei Zhang, Hanlin Wu, Yun-liang Peng, H. Ji","doi":"10.1163/15685411-bja10274","DOIUrl":"https://doi.org/10.1163/15685411-bja10274","url":null,"abstract":"\u0000Aphelenchoides besseyi is among the most devastating plant-parasitic nematodes and causes severe loss, mainly on japonica rice in China. Recently the nematode has been found to be present in the seeds of indica rice and the hybrid rice cultivars also show symptoms of the nematode damage. To understand the variations in different rice cultivars against A. besseyi, the dynamics of nematode population, the incidence of symptoms and the effects on plant yield were investigated in field experiments during 2017-2018 by inoculation of mixed stages of A. besseyi onto the seeds and seedlings of different types of rice cultivars. The results showed few nematodes could be recovered from the plants at the seedling and the end of tillering stages in all the cultivars. After flowering, the number of nematodes per panicle increased and the highest number was found in ‘Zheyou 18’ in 2017 (1050.2) and 2018 (732.1). The average incidence of the inoculated plants showing white-tip symptoms ranged from 0.5 to 10.3% and from 0.0 to 75.7% at the tillering stage in 2017 and 2018, respectively. The incidences of white-tip symptoms in the indica cultivars, including ‘9311’, ‘Minghui 63’ and ‘Nei 5 you 39’, were significantly lower than in ‘Xingxiang’, a japonica cultivar and ‘Zheyou 18’, a hybrid rice cultivar, both at the flowering stage in 2017 and at the end of the tillering stage in 2018. A strong interaction of the treatments and cultivars on the 1000-grain weight and panicle length was evident.","PeriodicalId":18928,"journal":{"name":"Nematology","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64643753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Potential of cavalcade, Centrosema pascuorum, leaves for controlling Meloidogyne javanica and quantification of active phytochemicals 马心花楸叶片防治爪哇木结线虫的潜力及活性化学物质的定量研究

IF 1.2 4区生物学

Nematology Pub Date : 2023-08-15 DOI: 10.1163/15685411-bja10273

N. Beesa, B. Chinnasri, A. Sasnarukkit, T. Dethoup, K. Jindapunnapat, A. Kiriga, K. Saikai, S. Haukeland, D. Coyne

{"title":"Potential of cavalcade, Centrosema pascuorum, leaves for controlling Meloidogyne javanica and quantification of active phytochemicals","authors":"N. Beesa, B. Chinnasri, A. Sasnarukkit, T. Dethoup, K. Jindapunnapat, A. Kiriga, K. Saikai, S. Haukeland, D. Coyne","doi":"10.1163/15685411-bja10273","DOIUrl":"https://doi.org/10.1163/15685411-bja10273","url":null,"abstract":"\u0000The legume cavalcade, Centrosema pascuorum, is used extensively as a cover crop and as a component of conservation agriculture systems. It is also an attractive rotation or cover crop for the management of root-knot nematodes (RKN; Meloidogyne spp.) as it is a non-host. RKN are persistent pests that are well known to be difficult to control. However, the mechanisms governing the non-host status of cavalcade is unknown. The current study established that cavalcade leaves are toxic to RKN as either aqueous extracts or soil amendments. Bioassays conducted using Meloidogyne javanica showed that a 90% concentration of aqueous extract derived from 1-month-old cavalcade leaves (89 mg crude extract ml−1) suppressed nematode hatch (82.9%) and killed infective second-stage juveniles of M. javanica (85.3%). Soil amendments with 1% (w/w) of 1-month-old cavalcade leaves (0.99 mg crude extract g−1 soil) also provided effective control of M. javanica in the glasshouse on okra. One-month-old leaves appeared more effective than 2- or 3-month-old leaves. The soil amendments had no adverse phytotoxic effect on okra seed germination. Our study demonstrates the potential for using cavalcade leaves or extracts to manage RKN. This may be due to the nematicidal activity of the various compounds in the leaves, such as flavonoids, phenols and terpenoids, which should be further assessed.","PeriodicalId":18928,"journal":{"name":"Nematology","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45317712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparison of transmission of the pine wood nematode, Bursaphelenchus xylophilus, via two different pathways from Monochamus alternatus to host trees 松材线虫松材线虫通过两种不同途径从松毛虫传播到寄主树木的比较

IF 1.2 4区生物学

Nematology Pub Date : 2023-08-14 DOI: 10.1163/15685411-bja10271

Yusuke Nakayama, K. Togashi

{"title":"Comparison of transmission of the pine wood nematode, Bursaphelenchus xylophilus, via two different pathways from Monochamus alternatus to host trees","authors":"Yusuke Nakayama, K. Togashi","doi":"10.1163/15685411-bja10271","DOIUrl":"https://doi.org/10.1163/15685411-bja10271","url":null,"abstract":"\u0000Bursaphelenchus xylophilus causes pine wilt disease and is transmitted to host trees by cerambycid adults of the genus Monochamus. There are two primary transmission pathways: via vector feeding wounds to healthy trees and via the oviposition wounds to dying or recently dead trees. To determine the ratio of nematodes transmitted via the different pathways, M. alternatus female adults were reared on Pinus densiflora fresh twig sections and wood pieces with the bark made favourable for oviposition. Transmission curves of B. xylophilus to twig sections were similar in shape to the nematode departure curves for each vector, whereas the transmission curves to wood pieces were dissimilar to the departure curves because of different age classes at the peak between the curves. Consequently, there was no similarity in shape between two transmission curves to twig sections and wood pieces. Of B. xylophilus transmitted to twig sections and wood pieces after vectors constructed the first oviposition wound, 38.7% was transmitted to twig sections and 61.3% to wood pieces. Using the results of present and previous studies, GLM analysis indicated that the probability of B. xylophilus transmission to twig sections was 0.481 and that B. xylophilus had a 9.7 times higher likelihood of feeding-related transmission to oviposition-related transmission than non-pathogenic B. mucronatus. Thus, the reproductively mature vectors are considered to be related to the incidence of pine wilt disease and dispersal studies on mature vectors would help to predict the expansion rate of areas affected by the disease in the current year.","PeriodicalId":18928,"journal":{"name":"Nematology","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41990595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Description of Devibursaphelencus lordeganensis sp. n. (Ektaphelenchinae) from Iran 来自伊朗的Devibursphelencus lordeganensis sp.n（Ektaphelenchinae）的描述

IF 1.2 4区生物学

Nematology Pub Date : 2023-08-14 DOI: 10.1163/15685411-bja10272

F. Aliramaji, A. Taheri, E. Shokoohi

{"title":"Description of Devibursaphelencus lordeganensis sp. n. (Ektaphelenchinae) from Iran","authors":"F. Aliramaji, A. Taheri, E. Shokoohi","doi":"10.1163/15685411-bja10272","DOIUrl":"https://doi.org/10.1163/15685411-bja10272","url":null,"abstract":"\u0000A population of the genus Devibursaphelenchus was collected from the inner part of the decaying Persian oak tree (Quercus brantii) from Lordegan city of Chaharmahal va Bakhtiari Province, Iran. The morphological and molecular characters confirmed the new species, namely D. lordeganensis sp. n. The new species is characterised by female body length (768-1026 μm), lip region separated from the rest of the body by a slight constriction, obscure lines on lateral fields, stylet length long, slender, wide-lumened, tripartite, composed of a conus with an aperture about half its length, a conophore about equal with the conus, and a shaft, taller than (conus + conophore) length, lacking basal knobs or swelling, excretory pore ca three metacorpal lengths posterior to the base of the metacorpus, post-uterine sac (PUS) (36-67 μm long; 1.3-3.7 times longer than vulval body diam.), absence or vestigial of rectum and anus, posterior end of the body conical with a rounded tip (in some specimens with a spherical protruded projection at tail tip), males 668 to 815 μm long, presence of two pairs of caudal papillae (P2 and P3), spicule length (15-17 μm) with long and wide bladed condylus, triangular rostrum with a blunt tip and small bursa flap ending at the tail tip. The molecular phylogeny based on 28S rDNA revealed that the new species stands close to D. alienae (LC629160) and D. lini (FJ768944, AM396570). The measurements, line illustrations, light microscopy photographs and phylogenetic analysis are given for the new species. In addition, a key to the species of Devibursaphelenchus is given.","PeriodicalId":18928,"journal":{"name":"Nematology","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48991869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ficophagus pisocarpae n. sp. (Nematoda: Aphelenchoididae), an associate of Ficus pisocarpa in China 中国松果榕的一种近缘种(线虫纲:松果榕科)

IF 1.2 4区生物学

Nematology Pub Date : 2023-08-08 DOI: 10.1163/15685411-bja10268

Yongsan Zeng, Dayuan Zhang, R. Giblin-Davis, J. Roberts

{"title":"Ficophagus pisocarpae n. sp. (Nematoda: Aphelenchoididae), an associate of Ficus pisocarpa in China","authors":"Yongsan Zeng, Dayuan Zhang, R. Giblin-Davis, J. Roberts","doi":"10.1163/15685411-bja10268","DOIUrl":"https://doi.org/10.1163/15685411-bja10268","url":null,"abstract":"\u0000A new species of the genus Ficophagus was recovered from the syconia of Ficus pisocarpa from Xishuangbanna, Yunnan province, China. It is described herein as Ficophagus pisocarpae n. sp. and is characterised by possessing the combined characters of a short PUS (6.4-9.3 μm or 0.3-0.4 VBD long), an excretory pore near the head, presence of crustaformeria, amoeboid sperm, three pairs of subventral papillae on the male tail (one pair just adcloacal (P2), one pair halfway between cloacal aperture and tail terminus (P3a), and one pair near tail tip (P4)), rounded male tail tip without mucron, absence of gubernaculum and rose-thorn-shaped spicule with conical rostrum. Ficophagus pisocarpae n. sp. was differentiated from other sequenced species by the partial small subunit (SSU) rRNA gene and D2-D3 expansion segments of the large subunit (LSU) rRNA gene. Phylogenetic analysis with the LSU D2-D3 expansion segment sequence suggested that F. pisocarpae n. sp. is clustered in the same highly supported monophyletic clade with F. annulatae, F. benjamina, F. curtipes and F. microcarpus. It differs morphologically from these species in lateral incisure number, EP position, spicule and uterus morphology and some morphometric characters.","PeriodicalId":18928,"journal":{"name":"Nematology","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48901301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Temporal dynamics of soil nematode population in an Acacia saligna invaded Mediterranean sand dune ecosystem 入侵地中海沙丘生态系统的金合欢土壤线虫种群的时间动态

IF 1.2 4区生物学

Nematology Pub Date : 2023-08-08 DOI: 10.1163/15685411-bja10270

Itaii Applebaum, T. Doniger, Y. Steinberger

引用次数: 0

Effect of short-term growth of mung bean and its incorporation with nitrogen fertiliser on the density of the root-knot nematode, Meloidogyne incognita, in soil 绿豆短期生长及其配施氮肥对土壤根结线虫密度的影响

IF 1.2 4区生物学

Nematology Pub Date : 2023-08-03 DOI: 10.1163/15685411-bja10265

Yayun Zeng, R. Perry, K. Toyota

{"title":"Effect of short-term growth of mung bean and its incorporation with nitrogen fertiliser on the density of the root-knot nematode, Meloidogyne incognita, in soil","authors":"Yayun Zeng, R. Perry, K. Toyota","doi":"10.1163/15685411-bja10265","DOIUrl":"https://doi.org/10.1163/15685411-bja10265","url":null,"abstract":"\u0000Soybean is attacked by multiple plant-parasitic nematodes and the major ones are soybean cyst nematode (SCN) and root-knot nematodes. Our previous study reported that 2 weeks growth of mung bean and its soil incorporation markedly reduced SCN density in soil via hatching stimulation by mung bean residue. This study aimed: i) to evaluate whether incorporation of mung bean in combination with N fertiliser decreased the density of Meloidogyne incognita, which attacks both soybean and mung bean; and ii) to determine the direct effect of ammonium solutions on M. incognita J2 and hatching. The results showed that after the growth period of mung bean for 2 weeks and 4 weeks of its incorporation, the density of M. incognita was significantly reduced by 54 and 72% in the mung bean treatment with and without N fertiliser (140 mg N (kg soil)−1), respectively, compared with the control. Soil urease activity was significantly higher in the mung bean with N fertiliser than in the control. Meloidogyne incognita second-stage juveniles were less mobile in NH4Cl solutions with 100-250 mg N l−1 than in 0 mg N l−1. Moreover, NH4Cl solutions with 140 mg N l−1 and 250 mg N l−1 significantly inhibited the hatching of M. incognita. This study demonstrated that 2 weeks growth of mung bean may be a potential trap crop for M. incognita and N metabolism might be involved to a certain extent in the suppression of M. incognita.","PeriodicalId":18928,"journal":{"name":"Nematology","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42218965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Aphelenchoides tenuis n. sp. (Tylenchina: Aphelenchoididae) found in loblolly pine logs imported from the USA 从美国进口火炬松原木中发现的火炬松类昆虫(火炬松属:火炬松科

IF 1.2 4区生物学

Nematology Pub Date : 2023-08-01 DOI: 10.1163/15685411-bja10267

J. Gu, Yiwu Fang, Xinxin Ma, A. Sánchez-Monge

{"title":"Aphelenchoides tenuis n. sp. (Tylenchina: Aphelenchoididae) found in loblolly pine logs imported from the USA","authors":"J. Gu, Yiwu Fang, Xinxin Ma, A. Sánchez-Monge","doi":"10.1163/15685411-bja10267","DOIUrl":"https://doi.org/10.1163/15685411-bja10267","url":null,"abstract":"\u0000Aphelenchoides tenuis n. sp. found in loblolly pine (Pinus taeda L.) logs imported from the USA, is described. It is characterised by a very slim body (a = 56.8 (45.8-67.2) and 49.1 (42.2-54.2) in males and females, respectively), three incisures in the lateral field, short stylet (9-12 μm), the excretory pore located at the level of nerve ring, the vagina is not sclerotised, the vulva has slightly protruding lips and lacks a flap and the post-uterine sac is well developed, forming ca 36.2 (28.4-48.2)% of the vulva to anus distance. The spicules are smoothly arcuate, the apex and rostrum are rounded and well developed, and the dorsal limb is 23.3 (21.1-25.5) μm long, without a hook-like structure at the distal tip. The male tail bears three pairs (2 + 2 + 2) of caudal papillae. The tail of both sexes is sub-cylindrical, the terminus bearing a bluntly pointed mucron with tiny nodular protuberances. The new species belongs to the Group 2 category of Aphelenchoides species sensu Shahina and is defined as A2-B1/2-C1-D1/2-E2-F2/3 according to the categorisation codes of OEPP/EPPO. Phylogenetic analysis based on 18S and 28S D2-D3 of rDNA, along with ITS and mtCOI, confirmed its status as a new species.","PeriodicalId":18928,"journal":{"name":"Nematology","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44951176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0