Nematologica最新文献

Synonymisation of Rotylenchus Filipjev, 1936 and Pararotylenchus Baldwin & Bell, 1981 (Nematoda: Hoplolaimidae)

Nematologica Pub Date : 1998-01-01 DOI: 10.1163/005225998X00055

M. Brzeski, Y. Choi

引用次数: 3

Detection of Chitinases in Potato Plants Following Infection With the Potato Cyst Nematodes, Globodera Rostochiensis and G. Pallida 马铃薯包囊线虫、罗斯托氏弧菌和白斑线虫侵染马铃薯植株几丁质酶的检测

Nematologica Pub Date : 1998-01-01 DOI: 10.1163/005325998X00063

S. Rahimi, R. Perry, D. Wright

引用次数: 5

Evidence for a sex pheromone in Steinemema carpocapsae 豆科植物中存在性信息素的证据

Nematologica Pub Date : 1998-01-01 DOI: 10.1163/005225998X00109

J. Neves, N. Simões, M. Mota

引用次数: 10

Redescription of the root-knot nematode Meloidogyne maritima Jepson, 1987 (Nematoda: Heteroderidae), a parasite of Ammophila arenaria (L.) Link. 根结线虫的重新描述(线虫纲:异线虫科)，沙芽线虫(L.)链接。

Nematologica Pub Date : 1998-01-01 DOI: 10.1163/005425998X00026

G. Karssen, A. V. Aelst, R. Cook

引用次数: 13

A Comparison of the Spatial Distributions of Three Plant-Parasitic Nematode Species At Three Different Scales 三种不同尺度植物寄生线虫的空间分布比较

Nematologica Pub Date : 1998-01-01 DOI: 10.1163/005425998X00062

B. Marshall, B. Boag, J. McNicol, R. Neilson

引用次数: 19

Virulence of Populations of Potato Cyst Nematodes (Globodera Spp.) From Europe and Bolivia Towards Differential Potato Clones Frequently Used for Pathotype Classification 欧洲和玻利维亚马铃薯囊肿线虫种群对常用病型分类的马铃薯差异无性系的毒力

Nematologica Pub Date : 1998-01-01 DOI: 10.1163/005725998X00078

I. F. Bendezu, M. Russell, K. Evans

{"title":"Virulence of Populations of Potato Cyst Nematodes (Globodera Spp.) From Europe and Bolivia Towards Differential Potato Clones Frequently Used for Pathotype Classification","authors":"I. F. Bendezu, M. Russell, K. Evans","doi":"10.1163/005725998X00078","DOIUrl":"https://doi.org/10.1163/005725998X00078","url":null,"abstract":"European populations of Globodera pallida (ten from the UK, two from Iceland, one from the Netherlands) and G. rostochiensis (nine from the UK, two from Italy and one each from Germany, Iceland and the Netherlands) and a Bolivian population of the latter species were reared on three commercial potato cultivars and five differential potato clones. Using Principal Component Analysis and the results of two Hierarchical Cluster Analyses, even populations from the same place (e.g. two from the same farm at Woburn and two from Feltwell) were shown to differ in virulence. Differences were also found between a population selected on potato clone Solanum vernei (VT n)2 62.33.3 and its unselected parent population (Cadishead). Cultivar Morag is partially resistant to G. rn.stochiensis but showed less resistance to G. pallida than reported previously. The virulence bioassay clearly distinguished the two PCN species but failed to classify populations into 'pathotypes'. The arbitrarily designated Pf/Pi value of 1.5 was not necessarily appropriate for distinguishing virulent from avirulent populations. Since virulence appears to be very much a quantitative biological trait (particularly with respect to G. pallida populations), and therefore impossible to classify in a scheme with the logical alternatives of false (does not reproduce) or true (reproduces), its value as a concept probably resides in the future design of decision making software for forecasting population development based on recorded Pf/Pi values.","PeriodicalId":18988,"journal":{"name":"Nematologica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90740154","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

Studies On an Artificially Fragmented Population of Potato Cyst Nematode Globodera Pallida 马铃薯球孢囊线虫人工破碎种群的研究

Nematologica Pub Date : 1998-01-01 DOI: 10.1163/005725998X00069

M. Phillips, V. Blok, A. Ploeg, B. Harrower

{"title":"Studies On an Artificially Fragmented Population of Potato Cyst Nematode Globodera Pallida","authors":"M. Phillips, V. Blok, A. Ploeg, B. Harrower","doi":"10.1163/005725998X00069","DOIUrl":"https://doi.org/10.1163/005725998X00069","url":null,"abstract":"A series of sub-populations was produced from a population of Globodera pallida by raising single cyst progenies on three susceptible potato cultivars. After completion of each generation, single cysts were taken to produce the next generation. Six generations were completed and then the resulting sub-populations were multiplied on the susceptible cultivar Ddsir6e. A sample of these sub-populations was then used to conduct a virulence test and to investigate the genetic variation among the sub-populations. The virulence test showed that the susceptible cultivar used in the generation of these sub-populations had a marked effect on the general reproductive capability of the sub-populations and that there was a range of variation in virulence on partially resistant clones. A RAPD study revealed that the range of genetic variation among these sub-populations was comparable to that shown between field populations in other studies and that there was a tendency for the sub-populations to be grouped in relation to the susceptible cultivar they were reared on. These results from an artificially fragmented population are discussed in relation to the introduction and spread of potato cyst nematodes in Europe.","PeriodicalId":18988,"journal":{"name":"Nematologica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74043582","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: 9

The Influence of the Host Plant On Lipid Reserves of Globodera Rostochiensis 寄主植物对罗斯托氏Globodera Rostochiensis脂质储备的影响

Nematologica Pub Date : 1998-01-01 DOI: 10.1163/005325998X00045

R. A. Holz, D. Wright, R. Perry

{"title":"The Influence of the Host Plant On Lipid Reserves of Globodera Rostochiensis","authors":"R. A. Holz, D. Wright, R. Perry","doi":"10.1163/005325998X00045","DOIUrl":"https://doi.org/10.1163/005325998X00045","url":null,"abstract":"Up to 16 fatty acids were detected in total lipids from roots and leaves of two potato cultivars, Desiree and Maris Piper, and one tomato cultivar, Pixie. The fatty acid profiles from roots were similar for all three cultivars and were dominated by C18 : 2 (30-40%) and C 16 : 0 (about 22%). The fatty acid profiles from leaves were similar for all three cultivars and were dominated by C18 : 3 (about 52%). Both root and leaf lipids contained mainly C18 fatty acids. The lipid content found in dry cysts of Globodera rostochiensis rcared on different cultivars was 11.0%, 12.8% and 9.6% for potato cvs Desiree and Foremost and tomato cv. Pixie, respectively. The total lipid comprised 74-82% neutral lipid, 14-19% non-acidic phospholipid and 4-7% free fatty acid in the three samples. Hatched juveniles (J2) from cysts cultured on cvs Desiree and Foremost contained 26.1% and 24.3% lipid, respectively. The total lipid comprised 77% neutral lipid, 17-18% non-acidic phospholipid and 6-7% free fatty acid in the two samples. The fatty acid profiles of the main lipid classes of cysts of G. rostochiensis cultured on the three different cultivars were similar. The fatty acid composition of the main lipid classes of freshly hatched J2 from cysts of G. rostochiensis cultured on the two potato cultivars differed only in their free fatty acid fractions. A comparison of the fatty acid profiles of the total lipid of potato roots, cv. Desiree, and the total lipid of cysts of G. rostochiensis showed major differences. Root fatty acids and nematode fatty acids were 38% and 22% saturated, 10% and 44% monounsaturated and 52% and 35% polyunsaturated, respectively. The fatty acid profile of root lipids was dominated by C16: 0, C18: 2 and C18 : 3 but the nematode lipids consisted of mainly C18: 1, C20: 1 and C20: 4. The differences in the fatty acids of host and nematodes indicate that G. rostochiensis is capable of fatty acid chain elongation and/or desaturation.","PeriodicalId":18988,"journal":{"name":"Nematologica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84576869","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

Bursaphelenchus hofmanni sp. n. (Nematoda, Aphelenchoididae) from spruce wood in Germany. 德国云杉木线虫属(线虫纲，线虫科)。

Nematologica Pub Date : 1998-01-01 DOI: 10.1163/005725998X00023

H. Braasch

引用次数: 17

Cultivation of axenic Heterorhabditis spp. dauer juveniles and their response to non-specific Photorhabdus luminescens food signals 异habditis spp.dauer的培养及其对非特异性光habdius食物信号的响应

Nematologica Pub Date : 1998-01-01 DOI: 10.1163/005525998X00089

R. Ehlers, R. Han

{"title":"Cultivation of axenic Heterorhabditis spp. dauer juveniles and their response to non-specific Photorhabdus luminescens food signals","authors":"R. Ehlers, R. Han","doi":"10.1163/005525998X00089","DOIUrl":"https://doi.org/10.1163/005525998X00089","url":null,"abstract":"A method is described for the production of bacteria-free Heterorhabditis bacteriophora and H. indica dauer juveniles by culturing these nematodes on Photorhabdus luminescens symbionts isolated from H. megidis and from H. bacteriophora, respectively. The nematodes develop and reproduce, feeding on the bacterial cells, but the symbionts are not retained by the dauer juveniles. Through surface sterilisation of the resulting dauer juveniles, axenic dauer juveniles could be produced, which were used for compatibility tests. The tests showed that H. bacteriophora did not reproduce on the symbionts of H. indica and that H. indica did not reproduce on the symbiont isolated from an undescribed Heterorhabditis species (Q6). Dauer juveniles of Heterorhabditis species start development (recover) in response to food signals excreted into the culture by P. luminescens. The recovery inducing signal may be produced by strains on which the nematode cannot reproduce. In cultures of such incompatible bacterial strains, developing dauer juveniles take up the bacteria in the intestine but die after 3 days, probably because they lack the enzymes needed to digest the bacterial cells. Food signals produced by Xenorhabdus species, the symbionts of Steinernema species, do not induce recovery of H. bacteriophora. Currently, bacteria isolated from different Heterorhabditis species are all assigned to the species P. luminescens. The specificity of the nutritive function supports the subdivision of the taxon P. luminescens into several species.","PeriodicalId":18988,"journal":{"name":"Nematologica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81292468","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: 45