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Role of symbiotic bacteria in the growth and development of the Sunn pest, Eurygaster integriceps

Kafil, Maryam; Bandani, Ali Reza; Kaltenpoth, Martin; Goldansaz, Seyed Hossein; Alavi, Seyed Mehdi
Fonte: Oxford University Press Publicador: Oxford University Press
Tipo: Artigo de Revista Científica Formato: text/html
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The Sunn pest, Eurygaster integriceps Puton (Hemiptera: Scutelleridae), is the most important pest of wheat and barley in wide areas of the world. Different aspects of the insect’s life history have been studied, but to date nothing is known about their microbial symbionts. Here, the con-tribution of symbiotic bacteria to the fitness of the bug was investigated by combining two different approaches to manipulate the host’s microbial community: the supplementation of anti-biotics into the insects’ diet and egg surface sterilization. First, bacteria cultured from gut homogenates were subjected to antibiotic screening tests using 20 different antibiotics. Norfloxa-cin was the most effective antibiotic, with the greatest inhibition zone among all antibiotics tested. Feeding norfloxacin to adult E. integriceps individuals significantly impaired growth and development of the offspring in a dose-dependent manner, i.e., higher antibiotic doses increased the negative effects on nymphal growth and development. Total developmental time from first nymphal instars to adult emergence in control animals was 30.1 days, but when adults had been offered diets with 10, 20, and 30 µg antibiotic per mg diet, the offspring’s developmental time was prolonged to 32.8...