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Entomoplasmatales) Associated with Tabanidae (Diptera) and Lampyridae (Coleoptera

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Entomoplasmatales) Associated with Tabanidae (Diptera) and Lampyridae (Coleoptera Georgia Southern University Digital Commons@Georgia Southern Legacy ETDs Summer 1994 Spiroplasma (Entomoplasmatales) Associated with Tabanidae (Diptera) and Lampyridae (Coleoptera) Jimmy Wedincamp Jr. Follow this and additional works at: https://digitalcommons.georgiasouthern.edu/etd_legacy Part of the Biochemistry, Biophysics, and Structural Biology Commons, and the Biology Commons Recommended Citation Wedincamp, Jimmy Jr., "Spiroplasma (Entomoplasmatales) Associated with Tabanidae (Diptera) and Lampyridae (Coleoptera)" (1994). Legacy ETDs. 402. https://digitalcommons.georgiasouthern.edu/etd_legacy/402 This thesis (open access) is brought to you for free and open access by Digital Commons@Georgia Southern. It has been accepted for inclusion in Legacy ETDs by an authorized administrator of Digital Commons@Georgia Southern. For more information, please contact [email protected]. SRmR..A$*W (EWTOMOfLASMATALES) ASSOCIATED IVITH Ti®AMIDAE (DPTSRA) AND LAMP^RIDAE (CCLECPTESA) ^bvry W^rnr^rrv?, Jr. QR 171 .Sfi Lm mM / Georgia SoutherTi University § , Zach S. Henderson Library 6] 5 &! v y OaOse©»e^ Spiroplasma (Entomoplasmatales) Associated with Tabanidae (Diptera) and Lampyridae (Coleoptera) submitted by Jimmy Wedincamp, Jr. B.S., Georgia Southern University, 1992 A Thesis Submitted to the Graduate Faculty of Georgia Southern University in Partial Fulfillment of the Requirements for the Degree MASTER OF SCIENCE IN BIOLOGY Statesboro, Ga. 1994 Spiroplasma (Entomoplasmatales) Associated with Tabanidae (Diptera) and Lampyridae (Coleoptera) By Jimmy Wedincamp Jr. Frank E. French, Chairperson an Cope land Daniel V. Hagan William S. Irby Approved: tjthi Vice President and Dean, College of Graduate Studies Date Acknowledgements I thank Dr. Frank E. French, Chairman of advisory committee, for advice, encouragement, and perseverance throughout this study; and Dr. Jonathan Copeland, Dr. Daniel V. Hagan, and Dr. William S. Irby for critical review of the manuscript. Sincere gratitude is extended to Dr. Robert F. Whitcomb and Roberta B. Henegar (ARS, Biocontrol Laboratory, Beltsville, Maryland) for donations of Spiroplasma cultures, antiserum, field collections of fireflies, laboratory analysis of cultures, and their advice and help. I thank Anthony J. LeCroy (Statesboro, Georgia) for friendship, laboratory assistance and field collections of fireflies and tabanids; Paul S. Johnson (Princeton, New Jersey) for obtaining firefly larvae; Marcus A. Toole (Statesboro, Georgia) for a tabanid trapping site; and Fredric V. Vend (State University of New York at Stony Brook, New York) for identification of fireflies. I thank my mother and father, Jimmy and Sylvia Wedincamp, for encouragement, love, and financial support; and my mother-in-law and father-in-law, Billy and Georgianna Cowart, for encouragement and love. I thank my wife, Dianna, for providing love, encouragement and understanding. iii Table of Contents Page Introduction 1 Chapter 1. Laboratory Infection and Release of Spiroplasma 4 Abstract 4 Introduction 5 Methods 5 Results 7 Discussion 8 References 9 Chapter II. Spiroplasmas Associated with Fireflies and Tabanids 12 Introduction 13 Materials and Methods 14 Results 17 Discussion 19 References 20 Table 1 23 Table 2 24 Discusion and Conclusions 25 Literature Cited 28 Appendix 1 33 Appendix 2 35 iv Introduction Spiroplasmas are helical and wall-less prokaryotes placed in the division Tenericutes, class Mollicutes and order Entomoplasmatales. They have been found in association with a wide variety of organisms including plants such as com, and arthropods, particularly insects. These associations are usually benign, but several spiroplasmas are known to adversely affect their hosts. Spiroplasma taiwanese and S. culicicola reduced the life span of Aedes aegypti females when inoculated intrathoracically (Vazeille-Falcoz et al. 1994) and Spiroplasma melliferurn is pathogenic to the honey bee (Apis nielliferi) (Clark and Whitcomb 1984). The genus Spiroplasma was established in 1973 by an international research team that studied a helical mycoplasma associated with Citrus Stubborn Disease. This study led to the cultivation and the characterization of the first spiroplasma species described, Spiroplasma citri (Saglio et al. 1973). Successful cultivations of spiroplasmas employed media based on the composition of sap in plant sieve tube elements and insect hemolymph and these accomplishments were followed by determination of important components incorporated in MID medium and later followed by the development of the SP-4 medium (Tully et al. 1977). In 1976 a helical wall-less prokaryote was discovered in high frequencies in bee hives at the Bioenvironmental Bee Laboratory in Beltsville Maryland. These were the first spiroplasmas cultured that were confined to insects (Clark et al. 1985). The primary isolation of the spiroplasmas, Spiroplasma melliferurn, was accomplished by transferring the hemolymph of a honey bee into SM-1 medium and maintaining the culture at 30° C. 1 2 Many serologically distinct groups of insect spiroplasmas have been isolated and successfully cultured. In addition there have been many uncultivable spiroplasmas observed through the use of microscopy. Relatively few insect species have been studied to determine the incidence of infection with spiroplasmas. In 1984 it was estimated 100 or less species of insects had been investigated of the estimated 30-50 million species that exist (Clark 1984). The methods currently used for classification are serological relatedness, polyacrylamide gel electrophoretic patterns of proteins, guanine-plus-cytosine base ratios, and sometimes DNA-DNA homology (Gasparich et al. 1993). The classification system includes 24 groups of spiroplasmas (Tully and Whitcomb 1993). Currently there are 30 recognized strains, but only 4 of the 9 different spiroplasmas found in tabanids are assigned to groups (Tully and Whitcomb 1993). Some spiroplasmas are pathogenic to their hosts and show potential as biological control agents (Clark and Whitcomb 1984). If spiroplasmas are to be used as biological insecticides much more must be determined regarding their bionomics. For example, is the maintenance of these microbes by trophic relationships among various arthropods or are they maintained in plants? The Colorado potato beetle spiroplasma is a good candidate for use as a biological control agent because of it's host specificity and the possibility of inserting a pathogenic gene (Konai et al. 1992). Tabanids are known to be rich reservoirs of spiroplasma (Clark et al. 1984, French et al. 1992) and are isolated with relative ease from the gut and hemolymph of many species (Appendix 1). Preliminary identification of spiroplasmas is done by a serological deformation test (Appendix 2). Of the nine strains isolated from tabanid flies (Tabanidae) (Whitcomb et al. 1992), only one Spiroplasma strain (EC-1 of group XIV) has been cultured from another arthropod, the firefly beetle Ellychnia corrusca (Lampyridae), where it was cultured from the gut and hemolymph (Hackett et al. 1992). 3 We hypothesize that tabanid spiroplasmas are maintained in nature by an alternate host system, wherein tabanids serve to carry and maintain spiroplasmas through the summer and an alternate host serves to overwinter the spiroplasma. Tabanid larvae are not known to carry spiroplasmas. Samples from 15 field collected larvae yielded no cultures of spiroplasma (French et al. 1992). The alternate host for tabanid infections of EC-1 could be E. corrusca. EC-1 was isolated from E. corrusca which appeared to be emerging from overwintering sites (Whitcomb, personal communication). Tabanid females are known for the bloodmeal required by most species prior to oviposition, however males and females require daily ingestion of water and carbohydrates (Schutz and Gaugler 1989, Teskey 1990). Spiroplasmas could be deposited at carbohydrate feeding sites and possibly infect other insects that feed at the same sites. Little is known of the natural cycles of the spiroplasmas of biting flies. This is much the same for mollicutes related to spiroplasmas. Nonhelical mollicutes have been isolated from several insects. Entomoplasma somnilux was isolated from the pupal gut of of Pyractonema angulata, and E. himinosiim and E. lucivorax were isolated from the gut of adult Photinus marginalis and Photinus pyralis (Williamson et al. 1990). The nonhelical mollicute involved in our study, Entomoplasma ellychniae, was originally isolated from the hemolymph of the firefly beetle, Ellychnia corrusca (Tully et al. 1989). This study was conducted to give insight into the tabanid-spiroplasma cycle by: (1) determining the exit points of spiroplasmas from tabanid hosts; (2) determining the survival rates of spiroplasma outside of the tabanid hosts; (3) determining if tabanids can be artificially infected by ingestion of infected sugar water; (4) determining if transmission of spiroplasmas and other mollicutes from fireflies to tabanids can occur if allowed to interact with one another; and (5) determining if firefly larvae can be infected with spiroplasma by ingestion of infected food. Manuscript to be Submitted to Microbial Ecology Laboratory Infection and Release of Spiroplasma (Entomoplasmatales: Spiroplasmataceae) from Horse Flies (Tabanidae: Diptera). J. Wedincamp Jr.,1 F. E. French,1 R. F. Whitcomb,2 and R. B. Henegar2 1 Biology Department, Georgia Southern University, Statesboro GA 30460-8042 ^ARS, Insect Biocontrol Laboratory, B465 BARCE, Beltsville MD 20705
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