Nematologica最新文献_第2页

Influence of Soil Microorganisms On the Reproduction of Helicotylenchus Dihystera and Its Pathogenicity To Millet 土壤微生物对黄螺杆菌繁殖及其对谷子致病性的影响

Nematologica Pub Date : 1998-01-01 DOI: 10.1163/005325998X00072

R. Duponnois, C. Villenave

{"title":"Influence of Soil Microorganisms On the Reproduction of Helicotylenchus Dihystera and Its Pathogenicity To Millet","authors":"R. Duponnois, C. Villenave","doi":"10.1163/005325998X00072","DOIUrl":"https://doi.org/10.1163/005325998X00072","url":null,"abstract":"Soils were collected from 3 agro-ecosystems in Senegal: a millet cultivated field, a one-year-old fallow field and a 17-year-old fallow field. Microbial biomass was higher in the old fallow soil than in the two other soils; bacteria and fungi were more abundant in the old fallow soil, particularly fungi belonging to the genus Mucor. The soils were autoclaved and inoculated with their own soil filtrates, either sterilised or unsterilised. Millet seedlings were planted in the different soils and Helicotylenchus dihystera was added. Irrespective of the microflora treatment, the reproductive index of H. dihystera was similar in the cultivated and the one-year-old fallow soils (Pf/Pi = 20 for an inoculum of about 800 H. dihystera per dm 3 of soil) and the nematodes had no measurable effect on plant dry weight. The native microorganisms had no effect on the reproductive index of H. dihystera. Reproduction in these sandy loam soils was greater than in the old fallow soil which was a loam (Pf/Pi = 6 for an inoculum of about 800 H. dihystera per dm 3 of soil). Soil texture may explain the difference. In the loam soil of the old fallow, the reproductive index of the plant-parasitic nematodes was doubled (Pf/Pi = 8 versus 4) in the presence of the native soil microorganisms. In this treatment, the dry weight of millet was 15% less than that in the nematode-free control. The pathogenicity of H. dihystera increased in soil with a high microbial status and high population of saprophytic fungi.","PeriodicalId":18988,"journal":{"name":"Nematologica","volume":"143 1","pages":"195-206"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86183866","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: 6

Characterization of the hatching fluid from Heterodera avenae 中华异蚊孵化液的特性研究

Nematologica Pub Date : 1998-01-01 DOI: 10.1163/005325998X00054

S. Ibrahim, Rajan, R. Perry

引用次数: 1

The morphology of Jensenonchus sphagni (brzeski, 1960) n. comb. from Scotland and comments on the taxonomic status and distribution of the species 水蚤(Jensenonchus sphagni, 1960)的形态。本文讨论了该物种在苏格兰的分类学地位和分布

Nematologica Pub Date : 1998-01-01 DOI: 10.1163/005425998X00035

V. Peneva, R. Neilson, B. Boag, Derek J. F. Brown

引用次数: 2

Observations on spear replacement in Xiphinema dentatum (Nematoda: Longidoridae) 齿状剑线虫换矛的观察(线虫纲:长线虫科)

Nematologica Pub Date : 1998-01-01 DOI: 10.1163/005325998X00036

M. Radivojević

{"title":"Observations on spear replacement in Xiphinema dentatum (Nematoda: Longidoridae)","authors":"M. Radivojević","doi":"10.1163/005325998X00036","DOIUrl":"https://doi.org/10.1163/005325998X00036","url":null,"abstract":"The process of spear (odontostyle + odontophore) replacement was determined by studying juveniles of Xiphinema dentatum in different phases of moulting. The process is subdivided into eight distinct phases, each readily identified by characteristic morphological features. The replacement odontostyle takes the functional position by assembling the new stoma behind the lining of the old cheilostoma, at the level where the replacement odontostyle inserts into the old odontophore during early moulting. A new spear is produced by the formation of the new odontophore behind the base of the new functional odontostyle, which was formed either during the previous moulting, or during embryogenesis (spear of the second stage juveniles). The most obvious event during spear replacement is development of a large space, void of tissues, in the region of the old chcilostoma, where a delicate sleeve-like membranous structure, coaxial with the old stoma, was observed. This extends posteriorly from about the old amphids to the lip region border of the newly forming stage. There are two, dorsal and ventral, flap-like cuticular extensions of the base of the cheilostoma lining. In the postlabial region there are, most likely four, sabre blade or carrot-like cuticular extensions.","PeriodicalId":18988,"journal":{"name":"Nematologica","volume":"44 1","pages":"137-151"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85550728","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: 0

Distribution and Sex Ratio of Ethmolaimus Pratensis De Man, 1880 (Nematoda, Chromadorida) in an Oligotrophic Lake 少营养化湖泊中草原田鼠的分布和性别比例(线虫目，线虫目)

Nematologica Pub Date : 1998-01-01 DOI: 10.1163/005525998X00061

W. Traunspurger

{"title":"Distribution and Sex Ratio of Ethmolaimus Pratensis De Man, 1880 (Nematoda, Chromadorida) in an Oligotrophic Lake","authors":"W. Traunspurger","doi":"10.1163/005525998X00061","DOIUrl":"https://doi.org/10.1163/005525998X00061","url":null,"abstract":"The distribution of Ethmolaimus pratensis (n = 1627 individuals), a common nematode species of Konigssee, was studied throughout 1986. E. pratensis comprised 3.5% of all nematodes in the littoral, 3.1% in the littoriprofundal and 5.5% in the profundal. The species contributed to a considerable portion of nematode biomass in Konigssee with mean annual biomass being highest at 1 m depth (0.14 mg/100 cm 2 ww; 17% of total nematode biomass) and 2 m depth (0.13 mg/100 cm 2 ww; 22% of total nematode biomass). At 190 m depth it was 40% of total nematode biomass. Population density of E. pratensis peaked three times a year at 1 m and 2 m water depth (spring, summer, winter) and twice in deeper regions. There was considerable water depth and time dependent variation in sex ratios of E. pratensis. In littoral and littoriprofundal zones the sex ratio was about 1 : 1, while in the profundal males were very rare. About 48% of E. pratensis individuals were found in the top sediment layer and the percentage increased with increasing water depth. Juveniles and adults of E. pratensis were partially segregated in the sediment column. Morphometric data revealed negligible sexual dimorphism in size, body shape and weight.","PeriodicalId":18988,"journal":{"name":"Nematologica","volume":"80 1","pages":"391-408"},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77385242","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: 5

Impact of climatic changes on the distribution of Paratrichodorus minor (Nematoda: Trichodoridae) as estimated using 'CLIMEX' 气候变化对小拟毛线虫分布的影响(基于CLIMEX)

Nematologica Pub Date : 1998-01-01 DOI: 10.1163/005425998X00053

G. Yeates, B. Boag, K. Evans, R. Neilson

引用次数: 4

Plant and Nematode Surfaces: Their Structure and Importance in Host-Parasite Interactions 植物和线虫表面:它们的结构及其在宿主-寄生虫相互作用中的重要性

Nematologica Pub Date : 1998-01-01 DOI: 10.1163/005325998X00018

M. J. Nobre, K. Evans

引用次数: 17

Five New Species of Mononchs From Malnad Tracts of Karnataka, India 标题印度卡纳塔克邦马尔纳德地区单爪鱼五新种

Nematologica Pub Date : 1998-01-01 DOI: 10.1163/005225998X00037

M. S. Jairajpuri, M. Dhanam