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United States Department of Agriculture

Agricultural Research Service

Title: Preliminary Description of a Bacterial Endosymbiont of Soybean Cyst Nematode, Heterodera Glycines

item Noel, Gregory
item Atibalentja, Ndeme - UNIV OF ILLINOIS

Submitted to: Nematropica
Publication Type: Abstract Only
Publication Acceptance Date: October 5, 2004
Publication Date: June 28, 2005
Citation: Noel, G.R., Atibalentja, N. 2005. Preliminary description of a bacterial endosymbiont of soybean cyst nematode, heterodera glycines. Proceedings XXVI Annual Meeting Organization of Nematologists of Tropical America. Nematropica.p. 28.

Technical Abstract: Almost 25 years ago, transmission electron microscopy (TEM) revealed the occurrence of an intracellular "bacterium-like organism" in second-stage juveniles of Heterodera glycines. Additional TEM studies also found the bacterium in males and females. Since the bacterium cannot be cultured, we extracted DNA from surface-sterilized infected nematodes and used universal bacterial primers and to PCR amplify, clone, and sequence the near full length of the 16S rRNA gene of the bacterium. A BLAST search of DNA databases revealed a 93% similarity index to the 'Bacteriodetes' symbiont, 'Canditatus Cardinium hertigii'. This endosymbiont, which parastizes wasps of the genus Encarsia was described in 2004. The endosymbiont of H. glycines has brush-like arrays of microfilament-like structures characteristic of the genus Cardinium. However, a dissimilarity index of 7% with C. hertigii indicates that the endosymbiont of H. glycines is a new species.

Last Modified: 4/22/2015
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