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Gender- and Species-Specific Characteristics of Bacteriomes from Three Psyllid Species (Hemiptera: Psylloidea)

Cooper, W. R., Horton, D. R.
ARS USDA Submissions 2014 v.49 no.2 pp. 190
Aphalaridae, Bactericera cockerelli, Cacopsylla pyricola, Hemiptera, Triozidae, appendages, bacteriocytes, bioactive properties, ecological function, females, gender differences, host plants, males, midgut, organelles, plant pathogens, plant pests, symbionts
Psyllids (Hemiptera: Pyslloidea) harbor bacterial symbionts in specialized organs called bacteriomes. Bacteriomes may be subject to manipulation to control psyllid pests including Bactericera cockerelli (Sulc) (Hemiptera: Triozidae) and Cacopsylla pyricola (Forster) (Hemiptera: Psyllidae) if the biological and ecological functions of bacteriomes and symbionts were better understood. To support research on psyllid bacteriomes and symbionts, this report provides descriptions of bacteriomes from B. cockerelli, C. pyricola, and Aphalara calthae L. (Hemiptera: Aphalaridae). In each species, bacteriomes were situated between the reproductive organs and the posterior midgut appendages. Tracheae attached to, and deeply penetrated the lateral margins of the bacteriome lobes. The shape of the bacteriome of A. calthae differed from those of B. cockerelli and C. pyricola, which were similar in appearance. Bacteriomes of females were larger and more darkly pigmented compared with those of males, regardless of psyllid species. Bacteriocytes of females also stained more intensely with hemotoxylin-eosin compared with those of males. These descriptions will be useful in future studies on the roles of bacteriomes and symbionts in interactions between psyllids, host-plants, and psyllid-vectored plant pathogens.