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Toxicity of 2,4-diacetylphloroglucinol (DAPG) to plant-parasitic and bacterial-feeding nematodes.
J Nematol
December 2009
USDA, ARS, Nematology Laboratory, Henry A. Wallace Beltsville Agricultural Research Center (BARC)-West, Bldg. 011A, Rm. 165B, Beltsville, MD 20705-2350, USA.
The antibiotic 2,4-diacetylphloroglucinol (DAPG) is produced by some isolates of the beneficial bacterium Pseudomonas fluorescens. DAPG is toxic to many organisms, and crop yield increases have been reported after application of DAPG-producing P. fluorescens.
View Article and Find Full Text PDFEvolution of hedgehog and hedgehog-related genes, their origin from Hog proteins in ancestral eukaryotes and discovery of a novel Hint motif.
BMC Genomics
March 2008
Dept. of Biosciences and Nutrition, Karolinska Institutet & School of Life Sciences, Södertörns Högskola, Alfred Nobels Allé 7, SE-141 89 Huddinge, Sweden.
Background: The Hedgehog (Hh) signaling pathway plays important roles in human and animal development as well as in carcinogenesis. Hh molecules have been found in both protostomes and deuterostomes, but curiously the nematode Caenorhabditis elegans lacks a bona-fide Hh. Instead a series of Hh-related proteins are found, which share the Hint/Hog domain with Hh, but have distinct N-termini.
View Article and Find Full Text PDFPhylogenetic analysis of nematodes of the genus Pratylenchus using nuclear 26S rDNA.
Mol Phylogenet Evol
February 1997
Department of Nematology, The University of California at Davis, 95616-8668, USA.
We used nucleotide sequences of the large subunit ribosomal genes (26S rDNA) to examine evolutionary relationships among species of the genus Pratylenchus (Order: Tylenchida, Family: Pratylenchidae), commonly known as root-lesion nematodes. Ten species of Pratylenchus were studied including, P. penetrans, P.
View Article and Find Full Text PDFNematodes were prepared for scanning electron microscopy by cryofracturing in ethanol and then by critical-point drying in carbon dioxide. Cross sections of Caenorhabditis briggsae and Xiphinema americanum showed the arrangement of the intestine, ovaries, muscle cells, and some layers of the cuticle. The technique is complementary to transmission electron microscopy and facilitates the interpretation of results from thin sections.
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