Journal of Nematology
نویسندگان
چکیده
Entomopathogenic nematodes (EPNs) in the genera Steinernema and Heterorhabditis and their associated bacteria (Xenorhabdus spp. and Photorhabdus spp., respectively) are lethal parasites of soil dwelling insects. We collected 168 soil samples from five provinces, all located in southern Thailand. Eight strains of EPNs were isolated and identified to species using restriction profiles and sequence analysis. Five of the isolates were identified as Heterorhabditis indica, and one as Heterorhabditis baujardi. Two undescribed Steinernema spp. were also discovered which matched no published sequences and grouped separately from the other DNA restriction profiles. Behavioral tests showed that all Heterorhabditis spp. were cruise foragers, based on their attraction to volatile cues and lack of body-waving and standing behaviors, while the Steinernema isolates were more intermediate in foraging behavior. The infectivity of Thai EPN strains against Galleria mellonella larvae was investigated using sand column bioassays and the LC50 was calculated based on exposures to nematodes in 24-well plates. The LC50 results ranged from 1.99-6.95 IJs/insect. Nine centimeter columns of either sandy loam or sandy clay loam were used to determine the nematodes’ ability to locate and infect subterranean insects in different soil types. The undescribed Steinernema sp. had the greatest infection rate in both soil types compared to the other Thai isolates and three commercial EPNs (Heterorhabditis bacteriophora, Steinernema glaseri and Steinernema riobrave).
منابع مشابه
Nematology-Status and Prospects: Let's Take Off Our Blinders and Broaden Our Horizons.
Some aspects of current fundamental nematological research and teaching in agriculture, soil zoology, biology and medicine, and parasitology are explored as they relate to the Society of Nematologists and the science of nematology in its broadest sense.
متن کاملWhat Every Author and Reviewer Should Know about the Publication Process in the Journal of Nematology.
The Journal of Nematology is a publication of the very highest quality for communicating the most recent discoveries in the science of nematology. The authors of this Viewpoint article desire to maintain the status of the journal while lessening the burden placed on the editorial staff. A few simple steps taken by authors during the manuscript preparation phase can greatly improve the quality o...
متن کاملApplications of geostatistics in plant nematology.
The application of geostatistics to plant nematology was made by evaluating soil and nematode data acquired from 200 soil samples collected from the A(p) horizon of a reed canary-grass field in northern Minnesota. Geostatistical concepts relevant to nematology include semi-variogram modelling, kriging, and change of support calculations. Soil and nematode data generally followed a spherical sem...
متن کاملIntroduction to Nematode Genome and Transcriptome Announcements in the Journal of Nematology.
The Journal of Nematology now offers publication of Nematode Genome Announcements (NGA) and Nematode Transcriptome Announcements (NTA). These brief reports announce the sequencing and assembly of a nematode genome or transcriptome resource, along with basic technical information on DNA sequencing and bioinformatic methods used. This publishing initiative offers a new avenue to openly and concis...
متن کامل