Nematologica最新文献_第5页

Descriptions of Filenchus Paravesiculosus Sp. N. and Three Other Species of the Genus Filenchus Andrássy, 1954 (Nemata: Tylenchidae) From Iran 伊朗麻蝇属(Filenchus paravesicullosus Sp. N.)及其它3种麻蝇属Andrássy记述，1954(线虫目:麻蝇科)

Nematologica Pub Date : 1998-01-01 DOI: 10.1163/005425998X00017

A. Karegar, E. Geraert

引用次数: 4

Impact of Clover Cyst Nematode (Heterodera Trifolii) Infection On Soil Microbial Activity in the Rhizosphere of White Clover (Trifolium Repens) - a Pulse-Labelling Experiment 三叶草囊线虫(Heterodera Trifolii)侵染对白三叶草根际土壤微生物活性的影响——脉冲标记试验

Nematologica Pub Date : 1998-01-01 DOI: 10.1163/005225998X00082

G. Yeates, S. Saggar, C. S. Denton, C. Mercer

引用次数: 79

Identification of Meloidogyne naasi Franklin, 1965 from Argentina. 阿根廷melidogyne naasi Franklin鉴定，1965。

Nematologica Pub Date : 1998-01-01 DOI: 10.1163/005325998x00090

M. Echeverría, E. Chaves

引用次数: 6

Trehalose: Its Role in the Anhydrobiotic Survival of Ditylenchus Myceliophagus 海藻糖:在二叉菌菌丝体无水生存中的作用

Nematologica Pub Date : 1998-01-01 DOI: 10.1163/005425998X00044

L. Higa, C. Womersley

{"title":"Trehalose: Its Role in the Anhydrobiotic Survival of Ditylenchus Myceliophagus","authors":"L. Higa, C. Womersley","doi":"10.1163/005425998X00044","DOIUrl":"https://doi.org/10.1163/005425998X00044","url":null,"abstract":"The anhydrobiotic potential of the free-living mycophagous nematode Ditylenchus myceliophagus was examined. Both individuals and small aggregates (mixed larvae and adults) were able to survive anhydrobiotically if dried slowly enough and exhibited those behavioural (swarming) and morphological (coiling) adaptations normally associated with dehydration stress. Comparison of biochemical profiles of nematode aggregates cultured on Agaricus bisporus or Rhizoctonia cerealis mycelia and exposed to 97% rh for three days (preconditioning) showed similar decreases in lipid and glycogen contents but trehalose contents increased to about 3.65% and 9.25% dry wt, respectively. Trehalose content had no effect on the abilities of the nematodes to survive exposure to reduced rh levels following preconditioning, with no nematodes surviving after 24 hr at 0% rh. Nematodes reared on R. cerealis and allowed to dehydrate naturally in culture for 6 weeks post-swarm showed an unexpected increase in lipid during swarming (28% to 42% dry wt), glycogen levels declined and trehalose levels increased from 2.0% to 4.0% dry wt. None of these changes were associated with dehydration stress. After 3 weeks nematodes began to coil and had lipid and trehalose contents of about 32% and 16.65% dry wt, respectively. At the end of the six week period lipid contents declined to 26% dry wt and trehalose contents remained stable. Naturally dehydrated nematodes showed an almost identical pattern of survival to preconditioned ones when exposed to reduced rh levels. The anhydrobiotic capabilities of D. myceliophagus are discussed in relation to other nematode anhydrobiotes and to the importance of trehalose as either a necessity for successful anhydrobiotic survival or a general adaptive response to environmental stress.","PeriodicalId":18988,"journal":{"name":"Nematologica","volume":"8 1","pages":"269-291"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80233619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 24

Description De Deux Nouvelles Especes De Rotylenchus Et Deux Populations De R. Agnetis Szczygiel, 1968 (Nematoda: Hoplolaimidae) Rotylenchus的两个新种和R. Agnetis Szczygiel的两个种群的描述，1968(线虫:Hoplolaimidae)

Nematologica Pub Date : 1998-01-01 DOI: 10.1163/005225998X00046

G. Germani, C. S. L. Massèse

引用次数: 4

New and Known Species of Xiphinema (Nematoda: Longidoridae) From Kenya 标题肯尼亚刺线虫属新知种(线虫纲:刺线虫科)

Nematologica Pub Date : 1997-01-01 DOI: 10.1163/004725997X00052

A. Coomans, J. Heyns

引用次数: 1

Comparison of the head patterns in the Tylenchoidea (Nematoda). 标题线虫总科头部形态的比较。

Nematologica Pub Date : 1997-01-01 DOI: 10.1163/005025997X00049

E. Geraert

{"title":"Comparison of the head patterns in the Tylenchoidea (Nematoda).","authors":"E. Geraert","doi":"10.1163/005025997X00049","DOIUrl":"https://doi.org/10.1163/005025997X00049","url":null,"abstract":"The first comparative study of head patterns in tylenchs was that of Sher & Bell (1975). De Grisse (1911) and Coomans & De Grisse (1981) srudied rhe underlying nervous system. The new information added since then is reviewed in this paper to see if the various patterns are characteristic of higher groupings (e.,9. families) within the Tylenchoidea. Therefore I used published and unpublished scanning electron micrographs (sEM) to produce schematized drawings. Comparing the photographs it was obvious that variation was found in the expression of pattems and sensilla. The schematized drawings give the maximum infbrmation obtained: e.g. whatever sensillum, distinct on a single photograph of a species or genus, was added on the drawing. In contrast to other nematodes there are no distinct lips in tylenchs. The head is an amalgamated lip region, internally strengthened by a cephalic framework and often including annuli, perhaps derived from ones formerly part of the body. The head can be continuous with the body, or variously offset but is always small to very small and unspectacular. It bears the mouth opening, which is nlinute and situated apically and centrally. There are two consecutive openings: the mouth opening seen at the outside is the prestoma opening: small, rounded to oval in Tylenchoidea and Aphelenchina, dorso-ventral slit to I-shaped slit in Criconematoidea. The stoma opening is found less than a micrometer to the","PeriodicalId":18988,"journal":{"name":"Nematologica","volume":"27 1","pages":"283-294"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79337996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 15

Tem Observations On the Body Cuticle of Trichodoridae Thorne, 1935 (Nematoda: Enoplia) 索恩毛线虫科体角质层的Tem观察，1935(线虫目:线虫目)

Nematologica Pub Date : 1997-01-01 DOI: 10.1163/005025997X00012

D. Mounport, P. Baujard, B. Martiny

引用次数: 2

Plant Parasitic Nematodes From the Solomon Islands With a Description of Boleodorus Solomonensis 所罗门群岛植物寄生线虫及所罗门Boleodorus Solomonensis的描述

Nematologica Pub Date : 1997-01-01 DOI: 10.1163/005125997X00048

W. Ye, E. Geraert

{"title":"Plant Parasitic Nematodes From the Solomon Islands With a Description of Boleodorus Solomonensis","authors":"W. Ye, E. Geraert","doi":"10.1163/005125997X00048","DOIUrl":"https://doi.org/10.1163/005125997X00048","url":null,"abstract":"Morphology and taxonomy of 14 species in 11 genera of plant parasitic nematodes collected from the Solomon Islands, are presented and discussed. Besides Eutylenchus vitiensis, Cephalenchus daisuce, Helicotylenchus erythrinae, H. hydrophilus, Criconema longulum, Ogma decalineatum, O. melanesicum, Discocriconemella limitanea, D. mauritiensis, Hemicriconemoides strictathecatus, Hemicycliophora litoralis, Xiphinema ensiculiferum and Aphelenchus isomerus, an undescribed species of Boleodorus was found, which is described here. All the species except O. decalineatum and X. ensiculiferum are new records for the Solomon Islands and four of them (Eutylenchus vitiensis, Helicotylenchus hydrophilus, Ogma melanesicum and Hemicycliophora litoralis) are rare and were found for the first time after their original descriptions. Boleodorus (Neobasiria) solomonensis n. sp. is characterized by its almost straight body, 550-650 μm long, head conical, lightly sclerotized, stylet 12.0-14.5 μm long, ovary with oocytes in one row, vulva at 53-58% of body length and tail elongate with rounded tip. Cephalenchus chilensis is synonymized with C. daisuce and Discocriconemella discolabia with D. mauritiensis. Scanning electron microscopy studies of Discocriconemella mauritiensis, Ogma melanesicum and Hemicycliophora litoralis are also included.","PeriodicalId":18988,"journal":{"name":"Nematologica","volume":"17 1","pages":"431-454"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87421132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Modelling the effect of random genetic drift on the virulence of potato cyst nematodes 随机遗传漂变对马铃薯囊线虫毒力影响的模拟

Nematologica Pub Date : 1997-01-01 DOI: 10.1163/004825997X00042

H. Schouten

{"title":"Modelling the effect of random genetic drift on the virulence of potato cyst nematodes","authors":"H. Schouten","doi":"10.1163/004825997X00042","DOIUrl":"https://doi.org/10.1163/004825997X00042","url":null,"abstract":"If only a few cysts are sampled from a large population and reproduced elsewhere, then the new isolated population may not be genetically representative of the original population. This phenomenon is called random genetic drift. The susceptibility of a cultivar to the new population could be significantly different from that to the original population. This deviation has been quantified for potato cyst nematodes via derivation of statistical equations. The standard deviation σ, caused by random genetic drift, is inversely proportional to the square root of the number of cysts sampled, decreases at increasing mating frequency per female, and attains its highest values at intermediate levels of cultivar susceptibility to the original population. Relative susceptibility of a cultivar is the reproduction factor P 1/P 2 on this cultivar relative to that on a susceptible reference cultivar, at a low inoculum density. If only one cyst is taken, then σ- equals 20-30% at a relative susceptibility to the original population of 20-80%, under assumptions given in the text. If more than 10 cysts are drawn, then σ is lower than 9%. Increasing the mating frequency from one to 25 decreases the random genetic drift by approximately the same extent as doubling the number of cysts per sample. Virulence based on two independent genes hardly changes drift compared to monogenic virulence. If the number of eggs per cyst is lower than 15, then additional random genetic drift arises. The results of this study may be used to judge how many cysts are needed in a sample to keep the sampling error sufficiently small, and for investigations on founder effects.","PeriodicalId":18988,"journal":{"name":"Nematologica","volume":"53 1","pages":"173-184"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74924362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4