Immune responses of Andrallus spinidens Fabricius (Hem.: Pentatomidae) to the entomopathogenic fungus, Beauveria bassiana Boisdual

Document Type : Research Paper

Authors

1 Department of Plant Protection, Faculty of Agricultural Sciences, University of Guilan, Rasht-Iran

2 Assistant Professor, Department Agronomy and Plant breeding, Faculty of Agricultural Sciences, University of Guilan, Rasht-Iran

3 Biological Control Department, National Institute of Plant Protection, Amol, Iran

Abstract

In this study, the effects of two isolates from the entomopathogenic fungus, Beauveria bassiana Boisduval were determined in immune system of the predatory hemipteran, Andrallus spinidens Fabricius (Hemiptera: Pentatomidae). Four types of hemocytes were identified in the hemolymph of the adult bug including prohemocytes, plasmatocytes, granulocytes and oenocytoids. Also, the effects of two entomopathogenic fungus isolates and latex bead were studied on the activity of phenoloxidase. The highest number of total hemocytes were found at time intervals of 12, 12, 48 and 48 hours post-injection by Tween80 (Control), latex bead, BB2 and AM-118, respectively. The highest number of plasmatocytes were determined 48, 48, 24 and 3 hours post-injection by Tween80 (Control), latex bead, BB2 and AM-118 but the number of granulocytes were observed after 48, 48, 12 and 12 hours, respectively. The highest number of nodules were observed 48, 48, 12 and 6 hours post-injection Tween80 (Control), latex bead, BB2 and AM-118, respectively. The highest activity of phenoloxidase were determined 6 hours post-injection by Tween80 (Control), BB2 and AM-118 and 3 hours post-injection by Tween80, respectively. To determine the gene of proPhenoloxidase, RNAs of the hemocytes were extracted and it was amplified by a pair of degenerate forward and reverse primers followed by cDNA synthesis. The results revealed a product with 675 bp based on reverse sequencing which had a 66% similarity with prophenoloxidase of Anasa tristis De Geer.Results of this study demonstrate that immune responses of the predacious hemipteran are different regarding various isolates of B. bassiana so the isolates should be used which have the lower virulence against the predator in integrated pest management programs.

Keywords

References

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Plant Pest Research
Volume 6, Issue 3
December 2016
Pages 25-38

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History

  • Receive Date: 19 December 2016
  • Accept Date: 19 December 2016

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