Diversity of the Most Commonly Reported Facultative Symbionts in Two Closely-Related Aphids with Different Host Ranges

Author(s)

Guidolin, A. S. ^[1] ; Consoli, F. L. ^[1]

Affiliation

^[1] Univ Sao Paulo, Dept Entomol & Acarol, Insect Interact Lab, ESALQ, Av Padua Dias 11, BR-13418900 Piracicaba, SP - Brazil

• Document type: Journal article
• Source: Neotropical Entomology; v. 47, n. 4, p. 440-446, AUG 2018.
• Web of Science Citations: 1

Abstract

Richness and abundance of facultative symbionts vary strongly with aphid species and genotype, symbiont strain, host plant, biogeography, and a number of abiotic factors. Despite indications that aphids in the same ecological niche show similar levels of facultative symbiont richness, existing reports do not consider the potential role of host plants on aphid microbial community. Little is known about how oligophagy and polyphagy may be influenced by secondary symbiont distribution, mainly because studies on secondary symbiont diversity are biased towards polyphagous aphids from the Northern Hemisphere. Here, we demonstrate the richness and abundance of the most common aphid-associated facultative symbionts in two tropical aphid species, the oligophagous Aphis (Toxoptera) citricidus (Kirkaldy) (Hemiptera: Aphididae) and the polyphagous Aphis aurantii (Boyer de Fonscolombe) (Hemiptera: Aphididae). Aphis citricidus is restricted to Citrus sp. host plants and closely related genera, whereas A. aurantii successfully exploits a wide variety of host plants from different families. Both were collected in the same ecological niche and our data basically indicated the same richness of secondary symbionts, but the abundance at which secondary symbionts occurred was very distinct between the two species. Spiroplasma was the most abundant facultative symbiont associated with A. citricidus and A. aurantii in the ecological niche studied. Single and multiple secondary symbiont infections were observed, but diversity of multiple infections was particularly high in A. citricidus. We discuss our findings and suggest hypotheses to explain causes and consequences of the differences in secondary symbiont diversity observed between these two aphid species. (AU)

• FAPESP's process: 12/04287-0 - Toxoptera citricida (Kirkaldy) (Hemiptera: Aphidae): associated simbionts and interactions with secondary symbionts
• Grantee: Aline Sartori Guidolin
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 11/50877-0 - Diversity, ecology and biotechnological potential of the symbiotic bacteriofauna associated with insects
• Grantee: Fernando Luis Cônsoli
• Support Opportunities: BIOTA-FAPESP Program - Thematic Grants