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Morpho-functional Analysis of the Head Glands in Three Auchenorrhyncha Species and Their Possible Biological Significance

Part of: Micrographia Collection

Published online by Cambridge University Press:  12 September 2022

Milos Sevarika Open the ORCID record for Milos Sevarika [Opens in a new window] ,
Andrea Di Giulio Open the ORCID record for Andrea Di Giulio [Opens in a new window] ,
Gabriele Rondoni Open the ORCID record for Gabriele Rondoni [Opens in a new window] ,
Eric Conti Open the ORCID record for Eric Conti [Opens in a new window]  and
Roberto Romani Open the ORCID record for Roberto Romani [Opens in a new window]
Milos Sevarika
Affiliation:
Department of Agricultural, Food and Environmental Sciences, University of Perugia, Perugia, Italy
Andrea Di Giulio
Affiliation:
Department of Science, University of Roma Tre, Rome, Italy
Gabriele Rondoni
Affiliation:
Department of Agricultural, Food and Environmental Sciences, University of Perugia, Perugia, Italy
Eric Conti
Affiliation:
Department of Agricultural, Food and Environmental Sciences, University of Perugia, Perugia, Italy
Roberto Romani*
Affiliation:
Department of Agricultural, Food and Environmental Sciences, University of Perugia, Perugia, Italy
*
*Corresponding author: Roberto Romani, E-mail: roberto.romani@unipg.it
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Abstract

The Cicadomorpha Philaenus spumarius, Neophilaenus campestris, and Cicadella viridis are known transmitters of the bacterium Xylella fastidiosa. Here, we studied the ultrastructural organization of their cephalic glands. Our investigations with scanning, transmission, focused ion beam-scanning electron microscopes and light microscope revealed for the first time in Auchenorrhyncha the presence of two types of cephalic glands. Both belonged to the Class III epidermal glands, according to the Noirot and Quennedey classification. Type A glands were the most common, being mainly located around antennae, lorum, and gena. Moreover, these glands were observed also on the abdomen and thorax, always in association with sensilla trichoidea. The second type of glands (type B) were located exclusively at the apical part of the postclypeus in P. spumarius and N. campestris. The ultrastructural organization was similar in both types, being composed of a secretory cell and a conducting canal. Differences were observed in the width of the cuticular opening, being smaller in the type II glands. In addition, we have recorded the presence of a maxillary sensory pit in all species and described sensilla trichoidea ultrastructural organization. Finally, we discussed the ultrastructural organization of the glands and their potential biological role.

Keywords

bacteria vectorPhilaenus spumariusSEMTEMultrastructure
Type
Micrographia
Information
Microscopy and Microanalysis , Volume 28 , Issue 6 , December 2022 , pp. 2177 - 2187
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Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press on behalf of the Microscopy Society of America

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