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Competition and reproduction in mixed infections of pathogenic and non-pathogenicBacillusspp.

Authors
Journal
Journal of Invertebrate Pathology
0022-2011
Publisher
Elsevier
Publication Date
Volume
96
Issue
2
Identifiers
DOI: 10.1016/j.jip.2007.03.003
Keywords
  • Bacillus Cereus
  • Bacillus Thuringiensis
  • Co-Infection
  • Competition
  • Mixed Infection
  • Reproduction

Abstract

Abstract Diamondback moth, Plutella xylostella, larvae were infected with a primary pathogen, Bacillus thuringiensis kurstaki (Btk) in single strain and mixed infections. Mixed infections comprised Btk and a non-pathogenic isolate, either Bacillus thuringiensis tenebrionis (Btt) or Bacillus cereus (Bc). All strains reproduced in larval cadavers, but there was evidence of competition between different isolates within hosts. Non-pathogenic isolates (Btt, Bc) had growth rates that were faster than Btk in vivo, whereas Btk outcompeted Btt in vitro. Passage through insects increased the in vitro competitive ability of Btk against Btt.

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