Expression patterns of antibacterial genes in the Hessian fly.

Abstract:

:We report on the transcriptional patterns of three antibacterial genes, a defensin (MdesDEF-1), a diptericin (MdesDIP-1) and a lysozyme (MdesLYS-1), during development in Hessian fly, Mayetiola destructor. Quantitative analysis by real-time PCR of mRNA levels in different tissues revealed a predominance of the transcripts for all three genes in the midgut, while analysis during development revealed greatest abundance in mRNA during the 3rd-instar. An evaluation of the midgut lumen revealed the presence of a diverse bacterial flora in larvae maintained on susceptible wheat. Further, the titer of bacteria in the midgut increased approximately 250-fold from the 1st-instar through the 2nd-instar. However, no detectable titer of bacteria was observed from the midgut lumen of larvae maintained on resistant plants. PCR amplicons produced using primers designed to conserved regions of the Pseudomonas 16S rRNA gene supported taxonomic identification for some of the bacteria comprising the midgut flora as belonging to the genus Pseudomonas. Analysis of mRNA for the Hessian fly antibacterial genes in larvae feeding on susceptible and resistant plants revealed an increase in the transcript level for MdesDEF-1 in 1st-instar larvae on susceptible plants, while the transcript levels for MdesDIP-1 and MdesLYS-1 were constant. Results suggest the transcriptional patterns of the Hessian fly antibacterial genes observed could be associated with the developing midgut bacterial flora present in larvae feeding on susceptible wheat as well as microbial challenge encountered at other stages in development.

journal_name

J Insect Physiol

authors

Mittapalli O,Shukle RH,Sardesai N,Giovanini MP,Williams CE

doi

10.1016/j.jinsphys.2006.08.007

subject

Has Abstract

pub_date

2006-11-01 00:00:00

pages

1143-52

issue

11-12

eissn

0022-1910

issn

1879-1611

pii

S0022-1910(06)00150-8

journal_volume

52

pub_type

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