Mycoplasma penetrans

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1. ツツガムシ咬傷 chigger bites
2. 帰国者の皮膚病変 skin lesions in the returning traveler

English Journal

Nondestructive imaging of plant-parasitic nematode development and host response to nematode pathogenesis.

Dinh PT, Knoblauch M, Elling AA.AbstractABSTRACT The secluded lifestyle of endoparasitic plant nematodes hampers progress toward a comprehensive understanding of plant-nematode interactions. A novel technique that enables nondestructive, long-term observations of a wide range of live nematodes in planta is presented here. As proof of principle, Pratylenchus penetrans, Heterodera schachtii, and Meloidogyne chitwoodi were labeled fluorescently with PKH26 and used to infect Arabidopsis thaliana grown in microscopy rhizosphere chambers. Nematode behavior, development, and morphology were observed for the full duration of each parasite's life cycle by confocal microscopy for up to 27 days after inoculation. PKH26 accumulated in intestinal lipid droplets and had no negative effect on nematode infectivity. This technique enabled visualization of Meloidogyne gall formation, nematode oogenesis, and nematode morphological features, such as the metacorpus, vulva, spicules, and cuticle. Additionally, microscopy rhizosphere chambers were used to characterize plant organelle dynamics during M. chitwoodi infection. Peroxisome abundance strongly increased in early giant cells but showed a marked decrease at later stages of feeding site development, which suggests a modulation of plant peroxisomes by root-knot nematodes during the infection process. Taken together, this technique facilitates studies aimed at deciphering plant-nematode interactions at the cellular and subcellular level and enables unprecedented insights into nematode behavior in planta.
Phytopathology.Phytopathology.2014 May;104(5):497-506. doi: 10.1094/PHYTO-08-13-0240-R.
ABSTRACT The secluded lifestyle of endoparasitic plant nematodes hampers progress toward a comprehensive understanding of plant-nematode interactions. A novel technique that enables nondestructive, long-term observations of a wide range of live nematodes in planta is presented here. As proof of prin
PMID 24313744

Comparative QTL analysis of root lesion nematode resistance in barley.

Galal A1, Sharma S, Abou-Elwafa SF, Sharma S, Kopisch-Obuch F, Laubach E, Perovic D, Ordon F, Jung C.Author information 1Plant Breeding Institute, Christian-Albrechts-University of Kiel, Olshausenstrasse 40, 24098, Kiel, Germany.AbstractKEY MESSAGE: This study demonstrates for the first time that resistance to different root lesion nematodes ( P. neglectus and P. penetrans ) is controlled by a common QTL. A major resistance QTL ( Rlnnp6H ) has been mapped to chromosome 6H using two independent barley populations. Root lesion nematodes (Pratylenchus spp.) are important pests in cereal production worldwide. We selected two doubled haploid populations of barley (Igri × Franka and Uschi × HHOR 3073) and infected them with Pratylenchus penetrans and Pratylenchus neglectus. Nematode multiplication rates were measured 7 or 10 weeks after infection. In both populations, continuous phenotypic variations for nematode multiplication rates were detected indicating a quantitative inheritance of resistance. In the Igri × Franka population, four P. penetrans resistance QTLs were mapped with 857 molecular markers on four linkage groups (2H, 5H, 6H and 7H). In the Uschi × HHOR 3073 population, eleven resistance QTLs (P. penetrans and P. neglectus) were mapped with 646 molecular markers on linkage groups 1H, 3H, 4H, 5H, 6H and 7H. A major resistance QTL named Rlnnp6H (LOD score 6.42-11.19) with a large phenotypic effect (27.5-36.6 %) for both pests was mapped in both populations to chromosome 6H. Another resistance QTL for both pests was mapped on linkage group 5H (Igri × Franka population). These data provide first evidence for common resistance mechanisms against different root lesion nematode species. The molecular markers are a powerful tool for the selection of resistant barley lines among segregating populations because resistance tests are time consuming and laborious.
TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik.Theor Appl Genet.2014 Apr 20. [Epub ahead of print]
KEY MESSAGE: This study demonstrates for the first time that resistance to different root lesion nematodes ( P. neglectus and P. penetrans ) is controlled by a common QTL. A major resistance QTL ( Rlnnp6H ) has been mapped to chromosome 6H using two independent barley populations. Root lesion nemato
PMID 24748125

Tungiasis in Haiti: a case series of 383 patients.

Louis SJ1, Bronsnick T, Louis FJ, Rao B.Author information 1Department of Dermatology, Hôpital Universitaire la Paix (State University Hospital la Paix), Port-au-Prince, Haiti.AbstractBACKGROUND: Tungiasis is endemic in poverty-stricken communities of South and Central America, Africa, Asia, and the Caribbean. This ectoparasitosis, caused by the female sand flea Tunga penetrans, is associated with considerable longterm morbidity in severely affected patients, including toe deformation and limited mobility. In Haiti, tungiasis is poorly documented but is known to occur. This study is the first formal investigation of tungiasis in Haiti.
International journal of dermatology.Int J Dermatol.2014 Mar 6. doi: 10.1111/ijd.12456. [Epub ahead of print]
BACKGROUND: Tungiasis is endemic in poverty-stricken communities of South and Central America, Africa, Asia, and the Caribbean. This ectoparasitosis, caused by the female sand flea Tunga penetrans, is associated with considerable longterm morbidity in severely affected patients, including toe deform
PMID 24601858

Japanese Journal

圃場におけるハクサイ黄化病発生程度とPCR-DGGE法に基づく土壌微生物相の関係

長瀬陽香,丹羽理恵子,松下裕子 [他]
日本植物病理学会報 81(1), 9-21, 2015-02
NAID 40020377841

群馬県のハクサイ黄化病発生圃場におけるキタネグサレセンチュウの確認と黄化病発病助長

池田健太郎,串田篤彦,桑原克也 [他]
関東東山病害虫研究会報 = Annual report of the Kanto-Tosan Plant Protection Society 61, 145-148, 2014-12
NAID 40020304177

エンドファイト導入イタリアンライグラスにおける４種植物寄生性線虫の増殖性

上杉謙太,佐々木亨,岩堀英晶,立石靖
日本線虫学会誌 44(2), 43-47, 2014
エンドファイト感染イタリアンライグラスの2 品種・系統（びしゃもん・JFIR-18）におけるサツマイモネコブセンチュウ、アレナリアネコブセンチュウ、ミナミネグサレセンチュウ、キタネグサレセンチュウの増殖を調査した。びしゃもん・JFIR-18 は調査個体ごとにエンドファイト感染の有無を調査した。すべての線虫とイタリアンライグラス品種の組み合わせにおいて、エンドファイト感染個体とエンドファイト非感染個 …
NAID 130005066016